The P0300 code means the engine computer has caught misfires that are not limited to one cylinder. They either jump around or hit several cylinders at once. A random misfire is harder to track down than a single dead cylinder, and the records owners and carmakers have filed with NHTSA show the causes are often deeper than a spark plug.
What the P0300 code means
Each time a cylinder fires, it gives the crankshaft a push. The crankshaft position sensor watches the speed of a toothed wheel on the crank, and when a cylinder fails to fire, the crank slows for a fraction of a second. The computer counts those dips and works out which cylinder caused each one.
If the misfires stay in one cylinder, you get a cylinder-specific code. If they move around or show up in several cylinders, the computer sets P0300. Its official name is “random/multiple cylinder misfire detected”.
Is it safe to drive with P0300?
It depends on the check engine light.
If the light is flashing, stop driving as soon as it is safe.
A flashing light means the misfire is heavy enough that unburned fuel is reaching the catalytic converter, where it burns and overheats the converter. A few miles like that can ruin a converter that was fine before.
When the light stays on without flashing, most cars can be driven gently to a repair shop. Keep the speed down and do not tow. Waiting weeks is still a bad idea, because every misfire sends some fuel into the exhaust.
P0300 and the cylinder codes P0301 to P0308
Misfire codes share one family. Knowing which one you have narrows the search.
| Code | What the computer saw |
|---|---|
| P0300 | Misfires that are random or spread over several cylinders |
| P0301 | Misfire in cylinder 1 |
| P0302 | Misfire in cylinder 2 |
| P0303 | Misfire in cylinder 3 |
| P0304 | Misfire in cylinder 4 |
| P0305 to P0308 | Misfire in cylinder 5, 6, 7 or 8 (engines with more than four cylinders) |
| P0316 | Misfire detected on startup, in the first 1,000 engine revolutions |
P0300 often appears together with one or more cylinder codes. That pattern helps: a P0300 with P0302 and P0304 points at something those two cylinders share, while P0300 alone suggests a cause that affects the whole engine, such as fuel delivery, a vacuum leak or engine software.
What carmakers’ bulletins blame for P0300
NHTSA holds 1,101 manufacturer bulletins that mention P0300. Counting each revision once and keeping only repair bulletins for US vehicles leaves 645 distinct bulletins.
What manufacturers prescribe for P0300
Share of 645 distinct repair bulletins that mention P0300, by the fix they call for
Source: NHTSA manufacturer communications (technical service bulletins), received 2010–2026. Revisions of the same bulletin are counted once. A bulletin can call for more than one fix.
An engine computer update is again the most common fix, in about a third of the bulletins. The mechanical causes behind it are where P0300 differs from simpler codes. Coolant leaking into the cylinders, broken lifters and other valvetrain parts, and internal engine wear each appear more often than spark plugs or ignition coils.
Those causes are expensive, and they explain why many owners replace plugs and coils without making the code go away. Some of the bulletins behind these numbers:
| Bulletin | Vehicles | What it says |
|---|---|---|
| TSB 22-2322 Ford · Aug 2022 | Escape 2017–2019 Fusion 2014–2019 Fusion Energi 2014–2019 Fusion Hybrid 2014–2019 | On the 1.5L EcoBoost, coolant can get into the cylinders. Owners see low coolant, white exhaust smoke and rough running along with misfire codes. |
| 23-NA-043 Chevrolet · Apr 2023 | Silverado 1500 2020–2021 Suburban 2021 Suburban 1500 2021 Tahoe 2021 | Replacement of valve lifters and lifter guides for misfires and poor running on these V8 trucks and SUVs. |
| PIP5776H GMC · Mar 2023 | Sierra 1500 2020–2021 Yukon 2021 | Technicians may find a lifter that has come apart. GM recommends replacing the lifter guide and four lifters. |
| A26-003 Honda · Aug 2026 | Accord 2018–2022 | The cylinder head gasket can lose its seal, leading to overheating, coolant loss and misfire codes P0300 to P0304. |
| TSB 26-2269 Ford · Jul 2026 | Bronco 2025 Explorer 2025–2026 Ranger 2025 | P0300 or P0316 on a cold start after the car sits 3 to 8 hours, traced to the machining of the intake ports. |
| 09-016-24 Dodge · Jul 2024 | Challenger 2023 | Misfires corrected by re-gapping the spark plugs. |
| 09-023-26 Jeep · Sep 2026 | Grand Cherokee 2026–2027 Grand Cherokee L 2026–2027 | An umbrella valve seal missing from the cylinder head cover can cause misfire codes. The dealer inspects for it. |
| A25-044 Honda · Jul 2025 | Accord Hybrid 2023–2025 CR-V Hybrid 2023–2025 | A leaking fuel injector makes the mixture rich and fouls the spark plugs. Rough running and a rattle come with it. |
Which vehicles report P0300 the most
P0300 by make
Owner complaints and service bulletins that mention P0300, top 10 makes
Owner complaintsService bulletins
Bulletins are counted per make and bulletin number; one bulletin can cover several models and years.
| Make | Model | Complaints |
|---|---|---|
| Ford | Escape | 38 |
| Chevrolet | Silverado 1500 | 23 |
| Ford | Fusion | 20 |
| Honda | Accord | 17 |
| Kia | Soul | 15 |
| Ford | Edge | 14 |
| Ford | F-150 | 12 |
| Chevrolet | Tahoe | 12 |
| GMC | Sierra 1500 | 12 |
| Honda | CR-V | 11 |
The Ford Escape leads owner complaints. Of its 38 complaints that mention P0300, 29 also mention coolant. Almost all of them (34) are 2017 to 2019 models. That lines up with Ford’s bulletin on coolant entering the cylinders of the 1.5L EcoBoost in those Escapes and in the Fusion. Chevrolet comes second, and a GM lifter bulletin covers 2020 and 2021 full-size trucks and SUVs.
P0300 complaints by model year
Model years 2005–2026; peak year 2017 highlighted
Complaints peak with 2017 and 2018 models. Owners who gave their mileage reported a median of 66,000 miles, which is far lower than for wear codes such as P0420.
What owners notice with P0300
What owners describe alongside P0300
Share of 465 NHTSA owner complaints that mention P0300
Counted by phrases in the complaint text. One complaint can mention several things.
Beyond the warning light, owners most often describe a loss of power. Rough idle comes next, and some cars stall. Nearly a quarter of the complaints involve a dispute over warranty coverage, which fits the expensive engine repairs in the bulletins.
How to track down a P0300 misfire
Tracking down an engine misfire that moves between cylinders takes a methodical approach. This order follows the bulletin data and starts with the steps that cost the least.
- Read every stored code and the freeze frame data. Lean codes (P0171, P0174), crank or cam sensor codes and cylinder codes stored with P0300 change where you look first.
- Watch the misfire counters for each cylinder with a scan tool. Even when the computer sets only P0300, the counters usually show which cylinders are involved and whether it happens at idle, under load or when cold.
- Have a dealer check your VIN for bulletins and software updates. A third of the P0300 repair bulletins are software, and several cover misfires that only happen on a cold start.
- Check the spark plugs and coils. Swap the coil from a misfiring cylinder to another one; if the misfire moves with it, the coil is the problem.
- Look at fuel and air. A leaking injector or a vacuum leak can make several cylinders misfire at once.
- Check the coolant level over a few days and look for white exhaust smoke. Dropping coolant with misfires points at a head gasket or coolant entering the cylinders.
- Test compression or cylinder leakage if the cheaper checks pass. On some GM V8 trucks and SUVs, a lifter that has come apart is a known cause.
P0300 questions owners ask
How do you fix a P0300 code?
Find out which cylinders are misfiring first, using the misfire counters in a scan tool. Then check for a bulletin or software update for your vehicle before replacing ignition parts. Replacing parts at random rarely fixes P0300, because the cause is spread across several cylinders.
What is the most common cause of a random misfire?
In manufacturer bulletins the most common fix is an engine computer software update. Among mechanical causes, coolant getting into the cylinders and valvetrain damage both come up more often than spark plugs or coils. On an older car with original plugs, worn plugs are still the first thing to check.
What sensors can cause a P0300 code?
The crankshaft position sensor is the one that detects misfires, so a faulty sensor or a damaged reluctor ring can set P0300 on its own. A failing mass airflow sensor or oxygen sensor can also cause real misfires by upsetting the fuel mixture. Look for lean codes such as P0171 or P0174 stored alongside P0300.
Can I drive with a P0300 code?
Only gently and only as far as a repair shop, as long as the check engine light is not flashing. If the light flashes, pull over when it is safe and do not keep driving. Unburned fuel from a heavy misfire overheats the catalytic converter and can destroy it.
Will new spark plugs fix P0300?
Sometimes. Worn or fouled plugs do cause misfires, and one manufacturer bulletin fixes misfires simply by re-gapping the plugs. Plugs appear in only a small share of P0300 bulletins, though, so if new plugs do not clear it, keep diagnosing before you buy coils.
Can low coolant cause a P0300 code?
Low coolant by itself does not, but a coolant leak into the cylinders does. Several bulletins tie P0300 to head gaskets or coolant intrusion. If the coolant level keeps dropping and you see white exhaust smoke, have the engine checked before the damage spreads.
What is the difference between P0300 and P0301?
P0301 to P0308 each point to one cylinder, numbered from 1. P0300 means the misfires are random or spread across several cylinders, so the computer cannot blame one of them.