C1008 Brake Fluid Level Circuit High

C1008 Brake Fluid Level Circuit High - When the Totally Integrated Power Module (TIPM) or Body Control Module (BCM) detects the brake fluid level circuit voltage is greater than expected for more than five seconds.

Possible Causes C1008 Code

• Brake fluid level signal circuit open.
• Brake fluid level signal circuit shorted to battery voltage.
• Brake fluid level switch internal failure.
• Sensor ground circuit open.
• Totally Integrated Power Module (TIPM) or Body Control Module (BCM).

Diagnose code C1008 Brake Fluid Level Circuit High

Step 1. Check for active DTC

Turn the ignition on, using the scan tool read DTC on the TIPM/BCM.

Does the scan tool display this DTC as active?

YES, go to step 2.

NO, test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

Step 2. Check the brake fluid level signal circuit for a short to voltage

Turn the ignition off, disconnect the brake fluid level switch harness connector. Disconnect the TIPM/BCM harness connector. Turn the ignition on, measure the voltage between ground and the brake fluid level signal circuit.

Is there any voltage present?

YES, repair the short to voltage in the brake fluid level signal circuit.

NO, go to step 3.

Step 3. Check the brake fluid level signal circuit for an open

Turn the ignition off, measure the resistance of the brake fluid level signal circuit between the brake fluid level sensor harness connector and the TIPM/BCM harness connector.

Is the resistance below 5.0 Ohms?

YES, go to step 4.

NO, repair the open in the brake fluid level signal circuit.

Step 4. Check the sensor ground circuit for an open

Measure the resistance of the sensor ground circuit between the brake fluid level sensor harness connector and the TIPM/BCM harness connector.

Is the resistance below 5.0 Ohms?

YES, go to step 5.

NO, repair the open in the sensor ground circuit.

Step 5. Brake fluid level switch internal failure

Reconnect the TIPM/BCM harness connector, connect a jumper between the brake fluid level signal circuit and the sensor ground circuit in the brake fluid level sensor harness connector. Turn the ignition on, using the scan tool, read the brake fluid level voltage.

Is the voltage below 1.0 Volt?

YES, replace the brake fluid level sensor.

NO, replace the TIPM/BCM.

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