PI0488C

File in Section:
Service Bulletin
Bulletin No.:
Date:
PI0488C
May, 2013
PRELIMINARY INFORMATION
Subject:
Diagnostic Information for Transmission No Forward, No Reverse, Slips, Cracked/Split
Fluid Filter
Models:
2010-2013 Cadillac CTS-V, Escalade Models
2010-2013 Chevrolet Avalanche
2010-2013 Chevrolet Camaro, Corvette, Express, Silverado, Suburban, Tahoe
2010-2013 GMC Savana, Sierra Models, Yukon Models
Equipped with 6L80 or 6L90 6-Speed Automatic Transmission (RPO MYC or MYD)
This PI is being revised to add the 2013 model year. Please discard PI0488B.
Condition/Concern
Some customers may comment that the transmission has no forward or reverse movement or that the transmission
is slipping.
When diagnosing a confirmed condition of no forward or no reverse or slipping, be sure to thoroughly visually inspect
the transmission fluid filter assembly. The filter may be cracked or split as shown in the photos below.
2665170
2665171
Recommendation/Instructions
If a cracked or split filter is found, the fluid pump should be disassembled and inspected for possible damage.
Inspect for any of the following conditions:
– Scored pump rotor or pump vanes
– Scored pump cover or pump rotor pocket
– Cracked pump slide
The transmission should also be evaluated for any possible distress to the clutches.
Testing and analysis of transmissions found to have split or damaged filters has shown that this condition may be
caused by a damaged pump.
A damaged pump can send a high pressure fluid spike down the filter neck on a cold start, resulting in the filter body
cracking or the filter seam splitting.
The filter is not defective and this is not a filter quality issue.
Important: Do not replace the filter without inspecting the pump. Failure to inspect the pump and clutches could
lead to a repeat condition.