DTC C0161. GMC Truck Canyon Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2009 🢒 Canyon Pickup - 2WD 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 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 00: Antilock Brake System (ABS) Brake Switch Circuit

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

Conditions for Running the DTC

The vehicle speed is greater than 16 km/h (10 mph).

Conditions for Setting the DTC

One of the following conditions exists:

•	The EBCM detects the brake pedal signal is continuously Active for 4.2 minutes when driving faster than 20 km/h (13 mph).

•	The EBCM detects the brake pressure sensor signal indicating a pressure increase but the brake light switch signal is not changing.

•	The EBCM detects 4 times, the vehicle accelerating to speeds above 40 km/h (25 mph) and decelerating down to speeds below 3 km/h (2 mph) and no change in the brake light switch signal.

Action Taken When the DTC Sets

•	The EBCM disables the antilock brake system (ABS), traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.

•	A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

•	The condition for the DTC is no longer present.

•	The EBCM clears the history DTC when a current DTC is not detected in 50 consecutive drive cycles.

Diagnostic Aids

The DTC C0161 00 can be set if the vehicle has been driven with the brake applied during acceleration.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

•	Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify DTC C0277 or C0890 is not set.

⇒	If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle