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October 1, 2022 Service bulletin

Spark Knock/Engine Symptoms

Jeep technical service bulletin 0901222 for 2018-2021 Jeep Grand Cherokee, 2018-2022 Jeep Wrangler and 2020-2022 Jeep Gladiator and others.

Bulletin number
0901222
Component
Engine and engine cooling
Summary
Spark Knock/Engine Symptoms This bulletin involves cleaning the piston heads and cylinder head combustion chambersto resolve a spark knock condition being caused by oil intrusion through the PCV system. The customer may describe a knocking or pinging noise coming from the engine upon acceleration.

Owners of these vehicles have filed 1,007 complaints in the engine category.

Vehicles covered

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