Diagnostic Instructions
DTC Descriptor
DTC C0161 11: ABS/TCS Brake Switch Circuit Above Maximum Threshold
DTC C0161 12: ABS/TCS Brake Switch Circuit Below Minimum Threshold
Circuit/System Description
The brake pedal position (BPP) sensor is an input to the body control module (BCM). The BCM then sends a serial data message to the electronic brake control module (EBCM) and other electronic control modules. The BPP sensor is a potentiometer
type sensor with a 5 volt reference circuit and a low reference circuit. The BCM supplies the 5 volt reference to the BPP.
Conditions for Running the DTC
C0161 11
| • | The vehicle speed is greater than 16 km/h (10 mph). |
| • | The ignition voltage is greater than 8 volts. |
C0161 12
| • | The ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
C0161 11
| • | The brake pedal is sensed as applied. |
| • | The vehicle speed is greater than 40 km/h (25 mph). |
| • | The vehicles acceleration exceeds 8 km/h per second (5 mph per second). |
C0161 12
| • | Brake pedal is not applied. |
| • | Traction control is not active. |
| • | The vehicle has reached speed greater than 24 km/h (14 mph). |
| • | The vehicles deceleration exceeds 11.5 km/h per second (7 mph per second). |
| • | Conditions for setting the DTC occur 3 times. |
Action Taken When the DTC Sets
No systems are disabled and no warning indicators or messages will appear.
Diagnostic Aids
The DTC C0161 11 can be set if the vehicle has been driven with the brake applied during acceleration.
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
Scan Tool Reference
Control Module References for Scan Tool Information
Circuit/System Verification
- 1. Verify DTC C0277 or C0278 is not set.
