2021-2025 Stellantis Engine Noise TSB S2509000002

Symptoms of Engine Noise

Owners of affected 2021-2025 Jeep, Dodge, and RAM vehicles may notice "noise from the engine compartment." This noise is often described as a "valvetrain-type noise" or a general "noise in the upper part of the engine." Such sounds can indicate an underlying issue requiring professional diagnosis. For example, if you hear a specific "Jeep Wrangler engine noise," it could be related to this bulletin. Any unusual engine sound, including a persistent "Jeep Wrangler engine noise," warrants attention.

Diagnosing Lash Adjuster (Tappet) Noise

Proper diagnosis is critical when addressing Noise, Vibration, and Harshness (NVH) complaints. The nature of these sounds, especially a lash adjuster (tappet)-type noise, can make pinpointing the exact source challenging. This difficulty often leads to initial misdiagnosis, underscoring the need for a systematic approach. Technical Service Bulletin S2509000002 highlights this complexity and emphasizes the importance of a thorough diagnostic process. Technicians are advised to consult the lash adjuster (tappet) noise chart, which is included in the service information. This specialized chart helps identify possible causes and guides the correction of lash adjuster (tappet)-type noise, ensuring an accurate repair.

Understanding Hydraulic Lifters

The TSB provides key information regarding hydraulic lifters:

• Exhaust Hydraulic Lifters: These are designed to be compressible. They exert a reactionary spring force during compression and fully expand when no compression force is applied.
• Intake Hydraulic Lifters: These should feel very firm and difficult to compress. Intake hydraulic lifters feature a dual feed mechanism to support the two-step Variable Valve Lift (VVL) system.

Important Notes for Technicians

This communication, identified as TSB S2509000002, documents past experiences and does not authorize warranty repairs. It serves as a record of known cases related to the vehicle symptom or condition. The document explicitly states that it does not provide conclusions about what is wrong with a specific vehicle. Technicians are responsible for making the appropriate diagnostic and repair decisions.

If a solution cannot be found, technicians should contact the STAR Center or their Technical Assistance Center via TechCONNECT or an eCONTACT ticket.

What Owners Should Do

If you are experiencing "engine noise" in your 2021-2025 Jeep, Dodge, or RAM vehicle, particularly a "valvetrain-type noise" or "lash adjuster (tappet) noise," it is highly recommended to have your vehicle inspected by a qualified service technician. Given the diagnostic complexities outlined in TSB S2509000002, professional expertise is essential. Technicians will refer to the comprehensive service manual repair procedure and the lash adjuster (tappet) noise chart to properly diagnose and address the issue. For instance, if you're concerned about a specific "Jeep Wrangler engine noise," scheduling a dealer visit is the most appropriate next step to ensure correct identification and resolution of the problem.

Source: NHTSA ID: 11015297