GM Service Manual Online
For 1990-2009 cars only

Condition

Action

Low engine power

Correct the engine condition.

Extreme fluid temperature

Inspect the cooling system and fluid level. Refer to Transmission Fluid Check .

Faulty speed sensor/circuit

Repair the circuit or replace the speed sensor or sensors. Refer to Speed Sensor Replacement .

Faulty temperature sensor/circuit

Inspect for a temperature reading which inhibits shifts.

Faulty or misadjusted shift selector

Repair the shift selector.