| Subject: | Noise from transmission area in Park or Neutral |
| Models: | 2009 Chevrolet Cobalt, Malibu, HHR |
| built between 16 June 08 and 04 July 08 with automatic transmission RPO MN5, 4T45E. |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
The vehicle may have a concern of a noise from transmission area in Park or Neutral, but goes away in Drive range and not moving. The noise may be noticed if vehicle is moving in gear. The noise may be coming from the Driven Sprocket Support.
Recommendation/Instructions:
If vehicle build date is between June 16th and July 4th of 2008, and the transmission Julian build date is between 8165 and 8178. The Julian date is stamped on the ID tag located on the transmission. See eSI for location information.
IF THE TRANSMISSION BUILD DATE IS OUTSIDE THIS RANGE (8165-8178) THEN DO NOT REPLACE THE DRIVEN SPROCKET SUPPORT. PROCEED WITH NORMAL DIAGNOSTIC PROCEDURES.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
