Transmission Will Not Upshift after Downshift (Replace Cruise Control Module)

Some customers may comment that when driving on the highway with the cruise control in operation, the transmission will downshift and will not upshift again, or upshifts are delayed until well after the expected point of upshift.

1. Replace the cruise control servo module assembly with new P/N 30025543.
2. Locate the cruise servo module on the left fender inner panel, directly behind the coolant recovery reservoir.
3. Carefully release the plastic clips retaining the cruise module cover from the cruise servo.
4. Loosen the lock nut retaining the cruise control cable to the servo unit bracket, slide the cable out of the bracket and from around the servo spool and set aside.
5. Disconnect the electrical wires from the servo assembly.
6. Remove the three bolts holding the unit to the inner fender and remove the servo from the vehicle.
7. Place the new servo module into position on the inner fender and install the three attaching bolts.

Tighten
Tighten the bolts to 10 N·m (89 lb in).

8. Attach the electrical wires to the connector on the servo unit.
9. Place the cable into the servo spool and through the retaining bracket.

Tighten
Tighten the retaining nut to 5 N·m (44 lb in).

10. Replace the cruise servo module cover.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: