P0300 on a 2023 Cadillac Escalade

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 2023 Cadillac Escalade

Ranked from 122 NHTSA owner complaints filed for this vehicle.

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1
Spun rod/main bearing failure from manufacturing debris (GM L87 6.2L recall N252494000 / NHTSA 25V-274)
High severity
Casting/machining debris left in the block during manufacturing damages the rod or main bearings; owners report sudden stall or seizure at highway speed with no warning lamp, engine knock/ticking beforehand, and torn-down inspections finding metal-contaminated oil or spun bearings. This is the dominant failure pattern in this batch.
Reported in 28 NHTSA complaints
Parts:engine long block connecting rod bearings oil pump
2
Active cylinder misfire with valvetrain/lifter clatter tied to the recall defect
High severity
A dealership technician documented 'active misfires' together with lifter clatter on both banks while investigating the L87 recall on this exact vehicle — direct evidence the code was driven by internal bottom-end/valvetrain failure rather than routine ignition wear.
Reported in 1 NHTSA complaint
Parts:engine long block
3
Worn spark plugs
Low severity
Eroded electrodes widen the spark gap and weaken ignition energy, causing misfire especially under load; inspect gap and electrode wear.
Common cause
Parts:spark plugs
4
Failing ignition coil(s)
Medium severity
A cracked or weak coil drops spark energy to one or more cylinders; swap coils cylinder-to-cylinder and watch whether the misfire follows.
Common cause
Parts:ignition coil
5
Clogged or leaking fuel injector
Medium severity
A partially clogged injector starves a cylinder of fuel while a leaking one floods it; both produce a misfire on that cylinder.
Common cause
Parts:fuel injector
6
Vacuum or intake leak
Low severity
Unmetered air leaning one or more cylinders can present as a random misfire, especially at idle; check intake boots and gaskets with smoke.
Common cause
7
Carbon-fouled intake valves
Low severity
Direct-injection engines accumulate carbon on the backs of the intake valves over time, disrupting airflow/atomization and triggering misfire; a walnut-blast cleaning restores flow.
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