Slight Vehicle Movement In Park At Start Up After Cold Soak - keywords 3T40 4L60 4L60E 4L65E 4L80E 4L85E 4T40E 4T45E 4T60 4T60E 4T65E 4T80E 5L40E 5L50E 6L50 6L80 6L90 6T70 6T75 AF225 AF235aisan
| Subject: | Slight Vehicle Movement In Park At Start Up After Cold Soak |
| Models: | 2007 and Prior Passenger Cars and Light Duty Trucks |
| Equipped with Automatic Transmission |
This PI is being superseded to add transmission models. Please discard PIP3763.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some vehicles may rock or move slightly forward or rearward while in park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
Recommendation/Instructions:
This slight movement is due to the residual transmission fluid in the clutch packs that creates a partial apply on start up. This movement is stopped by the parking pawl and/or transmission fluid exhausting completely from the clutch packs.
This slight movement has no adverse affects on the transmission and no repair should be attempted. This condition is normal. This can be verified by comparing with another identically built vehicle under the same cold conditions.
To prevent this condition from occurring, the parking brake should be utilized as per Owner's Manual recommendations anytime the vehicle is parked.
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.
