Transmission Does Not Shift Properly
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
| Condition | Action |
|---|---|
| Engine idle speed too fast during NEUTRAL to range shift | Adjust to correct idle speed. |
| Faulty throttle sensor/circuit | Repair or replace the sensor or circuit. |
| Faulty or sticking bleed ball in 1-2-3-4 clutch piston housing | Repair the transmission. |
| Excessive clutch running clearance | Rebuild the transmission and adjust clearances. |
| Shift adaptives not converged | Refer to FastLearn Procedure . |
| Instrument panel tachometer incorrect | Repair or replace the tachometer. |
| Incorrectly calibrated electronic speedometer | Calibrate the electronic speedometer. |
| Faulty speed sensor/circuit | Repair the circuit or replace the speed sensor. Refer to the speed sensor DTCs. |
| Loose speed sensor | Tighten the speed sensor retaining bracket bolt. Refer to Speed Sensor Replacement . |
| Degraded fluid | Change the transmission fluid and filter. Refer to Automatic Transmission Fluid and Filter Replacement . |
| Incorrect fluid level | Correct the fluid level. Refer to Transmission Fluid Check . |
| Low main pressure | Repair the transmission. |
| Intermittent conditions | Inspect the wiring harnesses and connectors. |
| Loose or damaged speed gear | Tighten the output flange bolt or replace the speed gear. |
| Sticking valves in the control valve body | Overhaul the control valve body assembly. |
| Leaking pressure control solenoids | Repair or replace the pressure control solenoids. |