P0300 on a 2022 Jeep Wrangler

P0300 is a generic OBD2 powertrain code for random or multiple cylinder misfire. Unlike P0301 through P0308, it does not point to one specific cylinder, so the cause can be ignition, fuel, air, sensor, or mechanical.

Not your vehicle? See general P0300 info.

Most common causes on the 2022 Jeep Wrangler

Ranked from 371 NHTSA owner complaints filed for this vehicle.

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1
Failed fuel injector / high-pressure fuel pump causing fuel dilution
High severity
One owner had a failed fuel injector and high-pressure fuel pump confirmed, with fuel continuing to enter the crankcase afterward; fuel dilution and injector malfunction are direct misfire causes on the 2.0L turbo engine.
Reported in 1 NHTSA complaint
Parts:fuel injector high pressure fuel pump
2
Engine ticking/knocking with backfire on acceleration
Medium severity
An owner separately reported a ticking/knocking engine noise and an exhaust backfire under acceleration, a classic drivability symptom of an active misfire.
Reported in 1 NHTSA complaint
3
Worn or fouled spark plugs
Low severity
Standard wear item and the most common generic cause of a random misfire code on a turbocharged 4-cylinder.
Common cause
Parts:spark plugs
4
Failing ignition coil(s)
Medium severity
A weakening coil-on-plug ignition coil is a frequent cause of an intermittent single- or multi-cylinder misfire on this engine family.
Common cause
Parts:ignition coil
5
Vacuum or boost/intake air leak
Medium severity
A boost or vacuum leak on the turbocharged 2.0L leans out the mixture enough under load to cause a misfire.
Common cause
6
Carbon-fouled intake valves
Low severity
Direct-injected turbo engines have no fuel washing the intake valves, so carbon buildup is a common contributor to rough idle and misfire over time.
Common cause

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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0300 on your car still needs shop confirmation before any repair.

Common symptoms

Flashing or steady check engine light
Rough idle
Shaking under acceleration
Loss of power
Fuel smell from exhaust

What to check before replacing parts

Scan for cylinder-specific misfire codes

Look for: A companion P0301–P0308 pins the misfire to one cylinder — start there. P0300 with no cylinder code points at something hitting several at once: fuel pressure, a large vacuum leak, or timing.

Inspect the spark plugs and coils

Look for: Pull the plugs: black/sooty = rich, oily = oil intrusion, white/blistered = lean or overheating, cracked porcelain or an out-of-spec gap = replace. Then swap a coil to another cylinder — if a cylinder-specific code follows the coil, the coil is bad.

Check fuel trims for a vacuum leak

Look for: High positive short- and long-term trims (worst at idle, improving as RPM rises) mean unmetered air is getting in. Smoke-test the intake and listen for hissing.

Verify fuel pressure

Look for: Compare running/cranking pressure to the vehicle spec. Low or dropping pressure starves multiple cylinders and reads as a random misfire — suspect the pump, filter, or regulator.

Compression / leak-down test if ignition and fuel check out

Look for: A cylinder 15%+ below the others, or leak-down hissing from the intake (intake valve), exhaust (exhaust valve), or oil filler (rings), means the misfire is mechanical — not a swap-in part.

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Matching symptoms

Car Runs Rough Flashing Check Engine Light