Transmission Will Not Shift to Forward or Reverse
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
| Condition | Action |
|---|---|
| Engine RPM too high | Reduce the engine RPM. It may be necessary to select NEUTRAL, and then D or R again. |
| Low fluid level | Add fluid to the proper level. Refer to Transmission Fluid Check . |
| Faulty throttle signal from engine | Correct the engine throttle signal. |
| Shift selector is not functioning properly | Repair the shift selector. |
| Speed sensor or sensors not functioning properly | Repair or replace the speed sensor or sensors or circuitry. Refer to Speed Sensor Replacement . |
| Mechanical failure to Low and Reverse clutch | Repair the transmission. |
| Mechanical failure in transmission torque converter, shafts, or planetaries | Repair the transmission. |
| Low pressure | Repair the transmission. |
| Faulty wiring in transmission control module (TCM) input/output function circuits | Correct the circuit wiring. |