Spark Plugs The spark plugs insulator on approximately 48,000 of the above vehicles may break due to...
Jeep technical service bulletin 66D Dealer for 2026 Jeep Grand Cherokee, 2026 Jeep Grand Cherokee L and 2026 Jeep Grand Cherokee 4xe.
- Bulletin number
- 66D Dealer
- Component
- Engine
- Summary
- Spark Plugs The spark plugs insulator on approximately 48,000 of the above vehicles may break due to excessive cylinder pressure. This pressure can cause the spark plug's ceramic insulator to crack, leading to a rough running engine. If this issue is not resolved promptly, the broken fragments can fall into the cylinder and cause internal engine damage.
Owners of these vehicles have filed 43 complaints in the engine category.
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