2021-2022 Jeep Spark Knock / Pinging Noise TSB

Owners of 2021-2022 Jeep Wrangler, Gladiator, and Grand Cherokee vehicles may notice an audible "Knocking or pinging noise coming from the engine upon acceleration." This symptom, commonly referred to as Jeep spark knock, is addressed by Technical Service Bulletin (TSB) 09-015-25. This bulletin outlines a specific repair procedure to resolve the underlying cause of this engine noise.

This TSB, identified as 09-015-25, specifically applies to JL vehicles equipped with a 3.6L V6 24V VVT Engine (Sales Code ERC) or a 3.6L V6 24V VVT E-torque Engine (Sales Code ERG). It also covers JT vehicles with the 3.6L V6 24V VVT Engine (Sales Code ERC) and WK vehicles with the 3.6L V6 24V VVT Engine (Sales Code ERC).

Symptoms of Spark Knock

The primary symptom reported by customers is a distinct "Knocking or pinging noise coming from the engine upon acceleration." This Jeep spark knock indicates an issue with the engine's combustion process, which, if left unaddressed, could potentially lead to long-term engine wear.

Cause of the Problem

The root cause of the spark knock condition is identified as "Oil intrusion through PCV system." When oil enters the combustion chambers via the Positive Crankcase Ventilation (PCV) system, it can lead to pre-ignition or detonation, resulting in the characteristic knocking or pinging sound. This oil intrusion necessitates a thorough cleaning of affected engine components.

Repair Procedure Summary

The repair outlined in TSB 09-015-25 involves a comprehensive cleaning and replacement process. Technicians will perform the following key steps:

1. Cylinder Head Removal: The cylinder heads are removed from the engine.
2. Cleaning: Both the cylinder head and piston crown combustion chambers are cleaned to remove oil deposits.
3. Cylinder Head Reinstallation: The cylinder heads are reinstalled using new cylinder head gaskets and bolts.
4. Spark Plug Replacement: All spark plugs are replaced.
5. Oil and Filter Change: The engine oil and oil filter are changed.
6. Coolant Refill: The engine coolant system is refilled.
7. PCV Valve Replacement: The PCV valve is replaced with an updated part, specifically Part No. 68609110AB.
8. DTC Clearing: Any Diagnostic Trouble Codes (DTCs) that may have set during the repair procedure are cleared.

Required Tools or Parts

To perform this repair, technicians will utilize the wiTECH diagnostic tool or an equivalent system. Several specific parts are required for the repair, including:

• PCV Valve (Part No. 68609110AB)
• Spark Plugs (Part No. SP225755AA)
• Cylinder Head Bolts (Part No. 06509564AA)
• Cylinder Head Gaskets (Left: 68284905AA, Right: 68284904AA)
• Antifreeze, Coolant (Part No. 68153921AA)
• Engine Oil (Part No. 68218950AB)
• Oil Filter (Part No. 68191349AC)
• Various other gaskets and seals, including valve cover gaskets, intake gaskets, and timing cover gaskets.

Important Warnings

This bulletin supersedes Technical Service Bulletin (TSB) 09-012-22, which was issued on October 01, 2022. Owners searching for information on the older bulletin should refer to this updated TSB 09-015-25. The repair procedure is reimbursable within the provisions of the vehicle's warranty.

Owner Action

If you own a 2021-2022 Jeep Wrangler, Gladiator, or Grand Cherokee and are experiencing Jeep spark knock or a pinging noise from your engine upon acceleration, it is recommended to schedule an appointment with an authorized Jeep dealership. They can diagnose the issue and perform the necessary repairs as outlined in TSB 09-015-25.

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Source: NHTSA ID: 11019618, TSB: 09-015-25