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DTC C0166

DTC C0166

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions has overviews of all diagnostic categories.


DTC Descriptor

DTC C0166 00

Traction Control System Brake Switch Circuit Malfunction

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
5V Reference

C0277 06

C0277 06

-

-

Signal

C0277 06

C0277 06

C0277 07

C0277 09

Low Reference

-

C0277 06

-

-



Circuit/System Description

The body control module (BCM) monitors the brake pedal position sensor and sends a serial data message when the brake pedal is applied. When the vehicle is stopping, the electronic brake control module (EBCM) monitors for the brake pedal applied serial data message from the BCM, with the brake pressure increasing and the vehicle slowing down, or when the vehicle is accelerating, the brake pedal is not applied and brake pressure is not increasing.

Conditions for Running the DTC


• Ignition ON.

• DTC C0131 is not present.


Conditions for Setting the DTC


• The EBCM detects brake pedal is not applied and the brake pressure is greater 15 bar (218 PSI) for 2 s.

• The EBCM detects the vehicle speed is greater than 16 km/h (10 MPH), the brake pedal is applied for 122 s, and brake pressure is less than 6.2 bar (90 PSI).


Action Taken When the DTC Sets

The EBCM disables the hill start assist for the duration of the ignition cycle.

Conditions for Clearing the DTC


• A current DTC clears when the diagnostic runs and passes.

• The EBCM will turn OFF the indicator in the next ignition cycle.


Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for information on diagnostic tools

Circuit/System Verification


1. Ignition ON, verify that DTC C0277 is not present in the BCM.

2. If DTC C0277 is present, refer to DTC C0277 or C0890 .

3. Ignition ON, observe the stop lamps while applying and releasing the brake pedal. Verify the stop lamps operate properly.

4. If the stop lamps do not operate properly, refer to Symptoms - Lighting .


Circuit/System Testing

Replace the K17 Electronic Brake Control Module and verify the DTC does not reset.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM and EBCM replacement, setup, and programming