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DTC P0856 > < DTC C122E

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DTC C0161

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 provides an overview of each diagnostic category.

DTC Descriptor

DTC C0161 5A:  Antilock Braking System Brake Switch Circuit Not Plausible

DTC C0161 71:  Antilock Braking System Brake Switch Circuit Invalid Data

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

5V Reference

C0277 06

C0277 06

C0277 07

-

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.

Conditions for Setting the DTC

C0161 5A

    •  The EBCM detects 4 accelerations from standstill to a vehicle speed greater 40 km/h (26 MPH) without any brake light switch signal changes.
    •  The EBCM detects the vehicle speed is greater than 20 km/h (13 MPH), the brake pedal is applied for 360 s, and brake pressure is less than 15 bar (218 PSI).

C0161 71

The electronic suspension control module detects an invalid brake pedal applied signal.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Action Taken When the DTC Sets

No actions were taken

Diagnostic Aids

The DTC C0161 can be set if the brake pedal is applied while accelerating or the brake pedal position sensor is out of adjustment.

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
    •  Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

  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 .
  2. Ignition ON, observe the stop lamps while applying and releasing the brake pedal. Verify the stop lamps operate properly.
    3. ⇒ If the stop lamps do not operate properly, refer to Symptoms - Lighting .
  3. Replace the module which sets the DTC and verify that the DTC does not reset.
    4. ⇒ If the DTC resets, replace the K9 Body Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup and programming

DTC P0856 > < DTC C122E