Circuit/System Testing
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition/Vehicle - Off
- Disconnect the electrical connector: X3 @ Q8 Control Solenoid Valve Assembly - B14A Transmission Output Shaft Speed Sensor
- Ignition - On / Vehicle - In Service Mode
- Verify the scan tool parameter: ISS/OSS Supply Voltage = OK
- If not the specified state
- Ignition/Vehicle - Off
- Disconnect the electrical connector: X3 @ Q8 Control Solenoid Valve Assembly - B14C Transmission Input Shaft Speed Sensor
- Verify the condition does not exist: Contamination with metallic debris @ Electrical Connector - X3
- If a condition exists - Repair or replace as necessary
- Go to next step: If no condition exists
- Ignition - On / Vehicle - In Service Mode
- Verify the scan tool parameter: ISS/OSS Supply Voltage = OK
- If not the specified state - Replace the component: Q8 Control Solenoid Valve Assembly
- If the specified state - Replace the component: B14C Transmission Input Shaft Speed Sensor
- Go to next step: If the specified state
- Perform the following procedure/test: Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test
Verify the procedure/test passes.
- If the procedure/test does not pass
Replace the component: Q8 Control Solenoid Valve Assembly
- Go to next step: If the procedure/test passes
- If the procedure/test does not pass
- Verify the condition does not exist: Park Gear - Damaged or misaligned reluctor ring.
- If a condition exists
Repair or replace as necessary.
- Go to next step: If no condition exists
- If a condition exists
- Test or replace the component: B14A Transmission Output Shaft Speed Sensor