M/T - Clutch Pedal Won't Return to UP Position
Bulletin No.: 05-07-31-001Date: April 08, 2005
TECHNICAL
Subject:
Clutch Pedal Does Not Return to Up Position During Shifts at High Engine RPMs (Inspect Date Code and Replace Clutch Kit)
Models:
2005 Cadillac CTS-V
2005 Chevrolet Corvette, SSR
with Tremec T56 6-Speed Manual Transmission (RPOs M10, M12, MM6)
Condition
Some customers may comment that while shifting at engine speeds greater then 6000 RPMs, the clutch pedal does not return to the up position. As the engine speed decreases, the clutch pedal will return to the up position.
Cause
It is possible that when the engine speed is greater than 6000 RPM and the clutch pedal is depressed, centrifugal loads on the clutch diaphragm spring may be greater than the clutch return load from the diaphragm spring. This force created by RPM would be directionally opposite to the clutch bearing force, causing a near net zero or less than zero return force. As a consequence, the clutch pedal may be stuck at the bottom of travel at the floor. Once the engine speed reduces to less than 6000 RPM, spring return load dominates and the clutch pedal returns to normal function.
Correction
Inspect the clutch date code and replace the clutch kit if built PRIOR to the following date code:
^ 4M21A/B/C for CTS-V and SSR
^ 4M13A/B/C for Corvette
1. Remove the transmission to inspect the date code on the clutch pressure plate (4). Refer to the applicable procedure below:
^ Corvette - Clutch Assembly Replacement
^ CTS-V - Clutch Assembly Replacement (CTS-V)
^ SSR - Clutch Assembly Replacement
Important:
The suspect clutches were built PRIOR to the date codes shown.
^ 4M2/A/B/C for CTS-V and SSR
^ 4M13A/B/C for Corvette
1. The date code is located on the pressure plate cover as shown above.
2. Replace the clutch kit (see part list below) if the date code on the pressure plate is PRIOR to the date code shown.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer