Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On / Vehicle - In Service Mode
- Verify the scan tool parameter:Brake Pedal Position Sensor=0.26 to 4.74 V
- If not between 0.26 and 4.74 V
Refer to Circuit/System Testing below
- Go to next step: If between 0.26 and 4.74 V
- If not between 0.26 and 4.74 V
- Verify the scan tool parameter:Brake Pedal Position Sensor=The value should change while moving the sensor through the entire range.
- If the value does not change
Refer to Circuit/System Testing below
- Go to next step: If the value changes
- If the value does not change
- Verify the scan tool parameter:Brake Pedal Position Sensor=The value should not spike or drop out.
Perform the action while monitoring the parameter:
- Wiggle the harness and connector:B22 Brake Pedal Position Sensor
- Wiggle the harness and connector: K20 Engine Control Module
- If the value spikes or drops out
Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)
- Go to next step: If the value does not spike or drop out
- 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 the DTC does not set.
- If the DTC sets
Refer to Circuit/System Testing below
- Go to next step: If the DTC is not set
- If the DTC sets
- All OK.