Tahoe 4WD V8-6.0L Hybrid (2008)
Case: Customer Interest
A/T - Slip/Shudder/Grind in 1st/2nd or Reverse
TECHNICAL
Bulletin No.: 08-07-30-033
Date: July 15, 2008
Subject:
Transmission Slip, Shudder or Grind Noise in First, Second or Reverse, DTC P079A Set (Replace Transmission Rear Case Assembly)
Models:
2008 Chevrolet Tahoe Two-Mode Hybrid
2008 GMC Yukon Two-Mode Hybrid
with 2ML70 Automatic Transmission (RPO M99)
and Built Prior to VIN Breakpoint 8R204089
Condition
Some customers may comment on any of the following conditions:
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Transmission slips, shudders or grinds on launch.
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Transmission slips in first, second or reverse gears.
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Check engine light illuminated.
These conditions will typically be noticed after the transmission reaches full operating temperature. A scan tool may reveal DTC P079A.
The DTC will only set under hard acceleration.
Cause
This condition may be due to the hybrid low, 1-2 clutch snap ring becoming mis-located, causing the piston to over-travel and the clutch to slip. This
condition may also be caused by delamination of the hybrid low, 1-2 clutch piston.
Correction
Replace the automatic transmission rear case assembly. Refer to the Rear Case and Gasket Replacement procedure in SI.
The rear case was formerly available only as part of the entire transmission assembly. DO NOT replace the transmission assembly for this condition.
Parts Information
Warranty Information
