Circuit/System Verification
WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On/Vehicle - In Service Mode
- Verify DTC P2805 is not set and no other DTCs are set.
- If DTC P2805 is set and no other DTCs are set
Replace the component: B303 Transmission Range Sensor
- Go to next step: If DTC P2805 is set and other DTCs are set
- If DTC P2805 is set and no other DTCs are set
- Verify DTC P0641, P0651, P0697, P06A3 is not set.
- If any of the DTCs are set
- Go to next step: If none of the DTCs are set
- Verify the condition does not exist: Incorrect adjustment - Refer to: Automatic Transmission Range Selector Lever Cable Adjustment
- If a condition exists
Repair or replace as necessary
- Go to next step: If no condition exists
- If a condition exists
- Operate the component: S3 Transmission Shift Lever - Select each position
Verify the scan tool parameter:
- Transmission Range Sensor 1 = The value should be within the range listed in the table: Transmission Range Sensor Duty Cycles
- Transmission Range Sensor 2 = The value should be within the range listed in the table: Transmission Range Sensor Duty Cycles
- If not in the specified range
Refer to: Circuit/System Testing
- Go to next step: If in the specified range
- 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.Verify that no DTC listed in the DTC Descriptor Category is set.
- If any DTC listed in the DTC Descriptor Category is set
Refer to: Circuit/System Testing
- Go to next step: If none of the DTCs listed in the DTC Descriptor Category is set
- If any DTC listed in the DTC Descriptor Category is set
- All OK.
NOTE:
This step only applies to the following component DTCs: B303 Transmission Range Sensor