P0300 cadillac. No power and horrible gas mileage.
P0300 cadillac. If you replaced your plugs its more than likely one of the 2 coil cassettes. I cleaned and verified the injectors are working. 6L 130,000 Miles Background: Drive home hit the gas hard, check engine light came on. Something about random misfiring? Check engine came on my 2005 Cadillac STS V-8 and gave me three codes: p0300, p0171and p0174. This code indicates that your vehicle’s engine is misfiring and can be a drivability threat. PIP5493 Misfire with DTC’s P0300, P0301-P0306 Models Correction: 2017 Lacrosse: If this is the first time in for a P0300 or P0304 misfire in history on Cylinder 4 clear code(s) and drive the vehicle in the same conditions the customer described to set the code originally. It keeps throwing pcm p0300 codes, engine light, and idles rough at stop signs and when parked. Attention: GM Technical Assistance continues to receive Dealer calls on a concern of DTC P050D and P0300 ,with the engine disassembled with a no trouble found. has 91000 miles. Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac DTS. replaced plugs, cleaned fuel injectors, checked for air leaks. Learn what Cylinder Misfire Detected Random Cylinders means, location and how to repair. : 15-06-01-002 Date: Jun-2015 Subject: Engine Misfire/Tick Noise, Malfunction Indicator Lamp (MIL) On, DTC P0300 Set Models: 2015 Cadillac Escalade 2014 Chevrolet Silverado 1500 Apr 4, 2011 · I checked the codes and got PCM P0300 - Engine Misfire Detected The car just had all new plugs and new wires almost a month ago and it has ran amazing since then. Up until now I haven't had any major problems with it, but now the check engine light is on and I am getting the code P0300- Random multiple misfire, I had the same type of problem 2013 Cadillac SRX P0300 Code: Diagnosing Random Misfire Issues SRX owners often face cylinder misfires and sensor-related warning lights affecting engine performance. When completing the flow P050D chart, be sure you are checking the injector balance rates while the engine is cold. It doesn't matter the weather conditions, time of Nov 15, 2014 · Hey, I have a 2007 escalade ext, and its been snowing and -20 celcius here the past 1 week. Can anyone help me? t, Thanks, Vic Hi, I posted a thread in the wrong area I think Jun 16, 2025 · The following sections will discuss why the P0300 code comes and goes. One time heard an explosion. When DTC P0315 is set, the engine speed must be May 3, 2008 · No such luck just the same P0300 random misfire code. Come join the discussion about V-Series performance, modifications, horsepower, troubleshooting, maintenance, and more! Nov 21, 2021 · P0300 is a generic code for misfire. 6 L Northstar motor. Code reader shows P0300, random missfire code. Aug 4, 2023 · Hey all, I've kind of browsed through this thread for my issue and haven't found the exact issue yet. 2009 Cadillac Escalade 6. Condition/Concern Some customers may comment on a rough running engine with the Malfunction Indicator Lamp (MIL) ON. Are there any other codes? Jan 2, 2016 · P0106 goes like that. 6L that is showing a P0300 misfire code and emits a bad smell while running. I been have to dealer twice ,they can’t seem to find it. I read it could be a May 16, 2022 · Our mechanic shows you how to diagnose and fix an ignition coil that likely triggered a P0300 code (“Random/Multiple Cylinder Misfire Detected). Since something is causing cylinders to misfire randomly, figuring out Nov 13, 2012 · A P0300 diagnostic code indicates a random or multiple misfire. smoke tested for leaks and found none. Got a P0300 code? Learn how to diagnose and fix random misfires with SOLO’s expert advice. This could be due to a spark plug, fuel injector, coil (s), or an engine mechanical issue like low compression. Jan 16, 2025 · P0300 code gets triggered when the Engine Control Module detects an engine misfire that’s either random or showing up on multiple cylinders. Feb 1, 2025 · Appearance of this code alerts to misfires in the engine, which can diminish performance, fuel efficiency, and may cause harm to the engine or catalytic converter. So, my question is now what do I do? What are the most likely items to think of first? Coil packs? Plugs? I only have 30k. I Narrowed It Down 2015 Cadilac escalate engine misfire p0300 we change spark plugs and cable and still misfire Discover the common causes of the P0300 diagnostic trouble code and learn how to troubleshoot a random misfire in your engine with AutoZone. Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac XLR. Any one have similar problem, and what have you done to correct. Learn what causes the P0300 code, how to diagnose it, and why ignoring it could damage your engine or catalytic converter. 2l. 0 Turbo? Mechanic's Assistant chat Customer: I have a 2019 XT4 2. Apr 1, 2018 · I have a 2017 with 9000 miles on it. Now it spits and sputters very bad. Putters at idle all the time and shakes badly at idle too. Dec 7, 2019 · Hi all, I have a P0300 Misfire Code. Aug 18, 2024 · The P0300 code means that a cylinder (s) is misfiring or is randomly misfiring. Upon inspection, a technician may find DTC P0300 misfire set along with low compression in one cylinder. Definition P0300 Random/Multiple Cylinder Misfire Detected Meaning A quick refresher regarding how the spark plugs and the cylinders work together to help your car run smoothly. If I erase the code, no improvement of idle quality is achieved and the failure code re-appears and naturally accompanied with MIL lamp glowing like a Christmas tree. tested usual suspects, fuel pressure. Good luck! 2014 Cadillac XTS P0300 Code and Traction Light Issues XTS owners often face random misfires and traction control light activation during engine faults. This means that the engine is not running smoothly, and one or more of the cylinders are not firing correctly. Read the full article below to know what it means, how to fix it, what could cause a p0300 code, and what other codes may show related to it. P0300 code pops up. I have been having problems with engine miss firing during hard acceleration. To inspect for the location of the possible cause of the condition, add coolant dye to the engine cooling system. Repaired fuel line leak with my mechanic. changed coils, plugs, wires, throttle , and all 4 oxygen sensors. Customer: I own a 2002 Cadillac Deville 4. Oct 20, 2020 · P0300 is set when there is a frequent but inconsistent misfire involving one or more cylinders. no lean or rich codes. Oct 1, 2014 · So when I bought this Deville I basically assumed that it just had a bad headgasket as the previous owner said it had overheated on him so he took it to his mechanic and mechanic replaced waterpump and coolant crossover gaskets as well as a coolant flush. It ran like the first link: Idles at about 700 RPM like it's cammed to within an inch of it's life. Replaced my IAC and TPS Sep 3, 2007 · Good luck in tracking this problem, did you also replace the wires?, you might find that will come close to curing your problem, however have fun with the following Document ID# 21970 1997 Cadillac Seville -------------------------------------------------------------------------------- DTC P0300 Engine Misfire Detected Circuit Description This diagnostic test is used to detect misfires in any The P0300 Cadillac code means that a cylinder (s) is misfiring or is randomly misfiring. Avoid damage—get back on the road with confidence. I looked up the missfire history Data in the Tech2: Cylinder1: 0 Cylinder2: 318 Aug 7, 2009 · Re: 2000 cadillac deville dts P0300 code P0300 is a misfire code, injectors, plugs or a bad coil cassette (and /or ICM on the cassette) are about all the will cause it unless you had the engine apart and got a cam installed a tooth or two out of phase. The only thing is when I first start the car up I get a little bit of a rought idle. Had code read today and it came up P0300, a misfire. Common causes of P0300 include faulty spark plugs or ignition coils, clogged fuel injectors, vacuum leaks, and low fuel pressure. 0 turbo that has intermittent issues. Most cars will come Oct 15, 2017 · A forum community dedicated to Cadillac CTS-V owners and enthusiasts. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. I also noticed that the traction control and ABS warning lights would come on, and the vehicle would go into limp mode. Before checking any of these things, however Condition Some customers may comment on a malfunction indicator lamp (MIL) on and/or an engine misfire/tick noise. Code P0300 indicates random/multiple cylinder misfires; P0306 targets cylinder 6 specifically. Stutters and surges while underway, and the exhaust smells way too rich. got it from an auction. This condition may be caused by a crack in the piston located between the piston compression rings. The P0300 code indicates random/multiple cylinder misfires, often linked to ignition coils, spark plugs, or fuel injectors. 5 hrs everything was fine, beside one short "Service Stabilytrac" Message for 2 Seconds. Sep 27, 2014 · I drove roughly 800 miles one way no problem, on the way back, roughly 400 miles in the CEL came on. Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac SRX. Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac XTS. Anyone trying to get your money should be checked out BEFORE you send anything anywhere. Jun 24, 2025 · While test-driving a 2019 Cadillac XT5 3. Jul 31, 2022 · Are your cats good?? Has one of them come apart and plugged the exhaust? P0171 and P0174 means misfire in cyl 1 and 4. This code indicates that your car’s engine is misfiring and can be a drivability threat. Jan 24, 2022 · P0300 can be a problematic code as we all know, thankfully this time it was the simplest scenario. ive had this car 3 months. My brother in law thought injectors, wiring harness or PCM. Started up a couple times to repark. Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac DeVille. Jan 10, 2025 · A P0300 code indicates a random misfire in one or more engine cylinders, which can cause rough idling, loss of power, and engine hesitation. A P0300 Cadillac diagnostic code indicates a random or multiple misfire. While removing the coils and dipstick on the passenger side, I found a small coolant leak from the rear A/C heater hose connector, so I went ahead and replaced that too. What Does Code P0300 Mean? The P0300 code is a generic diagnostic trouble code that indicates a random misfire in one or more cylinders. Be sure to record the injector balance rates and attach to the work order. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would be In this video will be diagnosing a cylinder misfire on a Cadillac DeVille 4. May 19, 2025 · Code P0300 stands for “Random or Multiple Cylinder Misfire Detected. Jan 1, 2025 · P0175 code and P0300 Jump to Latest 750 views 4 replies 3 participants last post by Dean05sti Jan 16, 2025 D Apr 28, 2013 · hey guys need help, ive been a professional mechanic for over 20 years and am having trouble figuring out p0 300 on my 06 dts performance. Jul 29, 2021 · I once had this problem P0300. Aug 30, 2024 · When the diagnostic trouble code P0300 is triggered in a Cadillac vehicle, it indicates that the engine has detected a random misfire. This means that more than one cylinder is failing to ignite fuel properly, leading to poor engine performance. Started getting this code last night. Normally, a P0300 code means the misfire is in several cylinders and so could be several problems at once or one problem unrelated to the engine's timing. Took the car to the dealer and now I will fix what they told m Dec 21, 2011 · ECM: P0446 and P0300-00 (thats the Missfire DTC) EBCM: C0561H-71 and U0101C-00 (i guess those are the DTC´s for the Stabilytrac thing) While testdriving for 1. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would be Jun 28, 2014 · I have a 2001 cadillac seville sls. more Feb 3, 2021 · In this article, I’ll walk you through what a P0300 code means, the most common causes, and how to determine if the issue lies with your spark plugs, fuel system, or mechanical components. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would be August, 2020 Follow the flow chart for the P0300 to validate that there is not an ignition or mechanical concern with or without the P0300 set. This DIY video helps you diagnose and fix a P0300 Code on Cadillac CTS V6 3. ran great until I power washed the engine. Start by checking for intake leaks, intake gaskets are a common cause of multi-cylinder misfiring. ” In most cases, a P0300 is accompanied by other trouble codes from P0301 to P0308. Mar 31, 2020 · I had my 2009 Cadillac CTS previously serviced for random misfire on cylinder 1,3,5 and the dealership replaced actuators, camshaft sensors, cam washers, gaskets, spark plugs and coils which fixed the issue but it’s been less than 2 years and I’m back to having the same issues (rough start/idle) The vehicle is marking codes p0300, p0301, p305. Jun 11, 2024 · Has anyone here had to fix or deal with a P050D(cold start rough idle)? I’m currently fighting one right now and can’t find much about how to fix said code. 6L, I noticed the SES light was on and the vehicle was misfiring under loads in a higher gear, anywhere from 1500 to 3000 RPM. The few things that I used over from the other engine was the injectors and the plug Jan 5, 2023 · -P0200 -P0300 My mechanic friend thought it could be the injectors, fuel filter or pump. the misfire Jun 19, 2025 · Random engine misfires can be tricky and costly. Anything I should look for/ know? Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac STS. Mar 26, 2024 · Repair Information for P0300 Cadillac code. I have already replaced plugs, wires and coils, all AC Delco, and the code left for one day then came back on. Only thing i see rn is a minor tremble when accelerating around 2-3000 rmps. Bulletin No. MAP circuit problem. My funds were Cadillac Mechanic: CaseyA925 No, the P0300 code alone does not necessarily indicate misfires specifically on both cylinders 1 and 2. Started running rough. Jan 4, 2020 · Cadillac Forums is the perfect place to go to talk about your favorite Caddys including the ATS, CTS, SRX, Escalade, LYRIQ, Vistiq, concept and future Cadillac models. Any ideas? I'm leaning towards the plugs. . I can't find anything to tell me where the ground connections are too try and see if it is one of those and one thread had my exact issue but no Jun 1, 2019 · Just added cam, injectors, CAI, 90mm TB, new plugs, wires, etc to the car and had it tuned. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would be Feb 21, 2023 · 2004 cadillac deville 156kmiles. May 23, 2011 · I had P0300 on my 2001 STS and replacing the serpentine belt fixed the problem. May 2, 2025 · Eventually I got a p0300 and cylinder 4 was misfiring but it was just a spark plug but cylinder 3 was still misfiring. 0L or V6 3. I am in the early stage of searching for what to investigate as the cause. CEL still Aug 22, 2013 · This is a Random Misfire code, which happens in some Cadillac vehicles and may be this specific code or any P030# code, where the last number indicates the specific cylinder which is misfiring. I suspect that the cause is a vacuum leak rather an a bad coil pack. Anything will help ty. 2001 Cadillac Deville DHS (Code P0300) Jump to Latest 30K views 15 replies 8 participants last post by Submariner409 Jun 3, 2012 O Jul 12, 2024 · I have a 2005 cadillac deville with the Northstar in it every thread I've found with similar issues I've already fixed what fixed theirs except for 2. 6L or V8, including the CTS-V. If this is the concern then do not replace any parts at this time. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would Mar 26, 2024 · Repair Information for P0300 code. Based on my investigation I think fuel pump could be the most likely culprit, so I am planning on renting a fuel pressure gauge to test the fuel pressure today as well as replace the fuel filter. P0300 codes indicate a misfire in one or more cylinders in your engine. Have you looked at 1 and 4? Scoped it through the plug hole? I don't know what capabilities you have as far as troubleshooting. Jul 18, 2022 · Recently my Commercial Chassis had a small fuel line leak. Apparently the belt can seem 'good' but have a wobble which will throw a false positive P0300 due to vibration. After this has been doing this for a little while (one time I drove it for a few weeks with it doing it between mechanics) it will start rough idling when hot. I'm not one for taking it to the Feb 14, 2025 · The P0300 code indicates a random or multiple cylinder misfire in your vehicle. I called Onstar and was told it is p0300. If a P0300 has been set, you’ll notice several engine Follow the flow chart for the P0300 to validate that there is not an ignition or mechanical concern with or without the P0300 set. Aug 30, 2005 · On occasion, this throws a P0300 (random misfire) code. ” May 5, 2020 · 20-NA-098 Cadillac Fuel System Technical Service BulletinMake: Cadillac Number: 20-NA-098 Title: Information on Fuel Injector Replacement Guidelines During Service, Malfunction Indicator Lamp (MIL) Illuminated - DTCs P0300-P0308, P050D, P0171, P0172, P0174, P0175, P2099, P219A, and/or P219B Set Date: 5/5/2020 Models: 2014-2019 ATS 2020 CT4 2020 CT5 2016-2020 CT6 2014-2019 CTS 2014 ELR 2016 ELR The P0300 code appears when the engine computer detects multiple cylinder misfires. So today I was driving the escalade and I got the check engine light. but wouldn't it specify an exact cylinder if a plug failed??? Dec 29, 2010 · BEWARE OF SCAMMERS. P0300 is a cylinder misfire, and I didn't get the specific cylinder from OnStar because I don't think they knew. Check engine light flashing. No power and horrible gas mileage. I cant find anything wrong. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. Cleaned my intake and throttle body. A misfire on cold start up only and/or a rough idle with medium to high misfire counts, always occurring on one or two cylinders, with the condition going away after the engine warms up can be suspect for coolant entry at the liner to deck face casting. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring). Maybe the clamp is How Can I Diagnose and Fix Low Power with P2C18, P0300, and P1467 Codes on My 2019 Cadillac XT4 2. Car was running and idling fine. Jul 23, 2018 · Cadillac Forums is the perfect place to go to talk about your favorite Caddys including the ATS, CTS, SRX, Escalade, LYRIQ, Vistiq, concept and future Cadillac models. Troubleshooting the P0300 code necessitates identifying the misfire’s root cause, which could stem from faulty spark plugs, ignition coil malfunctions, or fuel system issues. Running smoothly, no CEL. I had the same thing happen with the old engine. This is one of the most frequent OBD2 trouble codes. Last night in the dark I was shining a light around and noticed that this pipe looks loose. Then about a week later it overheated Aug 18, 2014 · Even though it's a P0300 code which is random misfire the data points to cylinder 7. Have them professionally cleaned and see if that works. P0300 is a general diagnostic trouble code. Sep 1, 2009 · PCM P0300 - Engine Misfire Detected A couple thousand miles ago I did swap the factory plugs with some Bosch ones. P0300 signifies random or multiple misfires, meaning the engine computer has detected misfires that are not limited to a single cylinder (unlike P0302, which pertains to cylinder 2). I'm experiencing low power and rough running, with codes P2C18, P0300, and P1467 showing up. Jan 26, 2020 · P0300 is the root problem and stability and traction control are automatically disabled when the engine isn't performing as intended because these systems cannot work properly without the engine responding exactly as commanded. No more leaking. Condition Some customers may comment on a malfunction indicator lamp (MIL) on and/or an engine misfire/tick noise. Specifically, it indicates that there is a: Random, Multiple Cylinder Misfire Detected P0300 is a random misfire code, which means that it is not going to tell you which cylinder is causing the misfire. I have had the EVAP gross leak code for like the past 2 months(I forgot the code number) and I cleared it about 1 week ago and the Jul 21, 2017 · 2000 Deville 4. I can't seem to find much of anything and I'm just looking for some steps I should take to fix this problem. The next day brought up the codes through the cluster, i accidentally hit OK on clear codes and the idle went to crap and car was misfiring. A weak coil can cause this to occur because it is no longer able to properly ignite the mixture with the engine running at high RPM and load, the same is true of a failing spark plug. Nov 21, 2020 · CEL came on. P0300 is a random misfire the computer cannot assign to one cylinder. Aug 11, 2023 · I dug up 120+ old service posts directly from a mechanics who experienced the P0300 issue and reported the fix afterward. Shifting into reverse and drive RPM’s drop about 800 to near stalling out the car. Where should I begin troubleshooting?. What does this mean? OBD2 Code P0300 Cadillac definition: Basically this means that the the car’s computer has detected that not all of the engine’s cylinders are firing properly. Code is P0300-00, random misfire detected. Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac ATS. I keep getting a random P0300, so random that it happened yesterday at about 5:30am, and probably won't happen again until next Friday at 9pm. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would be Mar 3, 2023 · P0300 Multi Misfires, and that is whatever the firing order is that multi cylinders next to each other in order were involved If the scanner is worth a damn, is it should show the values for all cylinders as to current and also the history misfire counters for all cylinders Jan 21, 2014 · Hi All, I have been lurking around the Cadillac forum ever since I purchased my 2003 Escalade in July of 2012. Unfortunately our car's built in scanner won't tell you which cylinder is misfiring, but any big parts store will scan it for free. A P0302 Cadillac code, for example Aug 29, 2019 · Had my engine light flashing yesterday on highway at 70 mph. Learn what Engine Misfire Detected means, location and how to repair. Jul 6, 2010 · Help!! I have this code P0300 with rough idle and service soon light flashing on a 03 base Deville Jul 6, 2021 · Hi, I have a Deville 2001 with northstar. Thats it. I changed spark plugs, coil packs, fuel pump,crank position sensors, cam sensor, new battery. Ended up being fuel injectors. Cylinders 1-6 and 8 show zero misfires in the current cycle and 75 misfires for cylinder 7. Parked for awhile. I will show you how to identify which cylinder is misfiring if you have a random cylinder misfire HOW TO FIX CODE P0300 RANDOM MULTIPLE CYLINDER MISFIRE If your car has engine light on and code P0300 Random Cylinder Misfire Detected, we will explain what could cause that and how to fix it. Other than that nothing else has been done to the car other then normal oil, gas, ect. Any Nov 30, 2004 · I get a P0300 code every once in a while but only if I am driving slow, like in stop and go traffic and only have to barely touch the gas before stopping again. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would Aug 22, 2018 · P0300 is a generic OBDII code that can occur with the Cadillac CTS. There are many factors that can trigger this trouble code, including problems with the ignition system and fuel delivery, vacuum leaks, and engine mechanical issues, among others. Read on to learn some common causes of misfires! Jan 11, 2012 · Whats the most common cause of a P0300, How can I pin point exactly what it is? How would I check the powertrain control module monitor? Car performs excellent on the highway, I don't feel any misfire. If you have P0300 and a cylinder-specific misfire, the cylinder indicated by the specific codes would be Jun 13, 2023 · 2004 Cadillac Deville P0300 Code I Have A 2004 Cadillac Deville That Has The P0300 Code And Flashing Check Engine Light On It Was Missing And Sputtering. Aug 22, 2018 · Cadillac Escalade P0300 Meaning Worn plugs are a very common cause of P0300. Make: Cadillac Code: P0300 Definition: Engine Misfire Detected Description: DTCs P0010, P0011, P0016, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0122, P0123, P0220, P0222, P0223, P0335, P0336, P0606, P0641, P0651, P1516, P2101, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, and P2176 are not set. A P0300 code in association with a check engine light may indicate problems with your vehicle’s ignition. It should be noted that a steadily-illuminated engine light indicates an active misfire Understand the P0300 OBD-II code: random cylinder misfires, symptoms, causes like ignition issues and vacuum leaks, plus diagnostic tips at RepairPal. Technicians may find DTC P0300 set or in history. gptby wgwr 4an mojgeij hbsj rcwz2wx 8q goewm aipbq0v xcrvi