Circuit/System Verification
WARNING: This page is about a different car, the 2009 GMC Yukon and 2009 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Perform the Transmission Fluid Check
to verify correct fluid level and condition. The transmission fluid level should be within the crosshatch band and the transmission fluid should be red or dark brown.
- If the transmission fluid is low or discolored, refer to Automatic Transmission Fluid and Filter Replacement .
- Operate the vehicle in Drive and ensure that the TCM commands all gears. The ratios should match the commanded gear for all gears. Refer to Shift Solenoid Valve State and Gear Ratio
.
- If the gear ratios do not match the commanded gear, inspect the following and repair/replace as necessary:
- Inspect the shift solenoid/hydraulic circuit for an internal malfunction.
- Damaged seals on the shift solenoid valve. Refer to Shift Solenoid Leak Test for further diagnosis.
- If the gear ratios do not match the commanded gear, inspect the following and repair/replace as necessary:
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.