JEEP

09-017-26

Manufacturer communications

Publication date: 2026-08-05
Received by NHTSA: 2026-08-13
NHTSA record numbers: 11036158

Manufacturer summary

Original wording in English

Umbrella Valve Seal Missing From Cylinder Head Cover Customer may experience a MIL-ON and/or an indication of low engine oil level. SYMPTOM: Upon inspection the technician may find the following: 1. One or more of the following Diagnostic Trouble Codes (DTCs) have set:
• P0300-00 - Random/Multiple Cylinder Misfire Detected.
• P0301-00 - Cylinder 1 Misfire.
• P0302-00 - Cylinder 2 Misfire.
• P0303-00 - Cylinder 3 Misfire.
• P0304-00 - Cylinder 4 Misfire. 2. Engine oil level is low. IMPORTANT! If none of above symptoms are present, this TSB does NOT apply. This bulletin involves inspecting the engine oil level, possibly inspecting for a missing umbrella valve seal on the underside of the cylinder head cover and, if necessary, replacing the cylinder head cover

NHTSA manufacturer communications ↗