Traction Control/Stability Control Indicator Malfunction
Traction Control/Stability Control Indicator Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC B2745
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Traction Control Switch Circuit
Diagnostic Fault Information
Circuit/System Description
The driver may disable the Traction Control System by pressing the traction control switch. The body control module (BCM) supplies a 12 volt signal on the traction control signal circuit. When the traction control switch is pressed, this voltage signal is grounded.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The BCM detects low voltage on the traction control signal circuit for 60 seconds.
Action Taken When the DTC Sets
* The BCM sends a serial data message to the electronic brake control module (EBCM) informing the EBCM that the desired TCS state cannot be determined.
* A driver information center message and/or warning message 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 100 consecutive drive cycles.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
ABS Description and Operation (with StabiliTrak) ABS Description and Operation (with StabiliTrak)ABS Description and Operation (without StabiliTrak) ABS Description and Operation (without StabiliTrak)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information.
Circuit/System Verification
Ignition ON, observe the scan tool BCM Traction Control Switch parameter while pressing and releasing the Traction Control Switch. The reading should change between Active and Inactive.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the traction control switch.
2. Test for less than 5 ohms between the ground circuit terminal C and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Traction Control Switch State parameter is Active.
• If not the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a 3A fused jumper wire between the signal circuit terminal F and the ground circuit terminal C. Verify the scan tool Traction Control Switch State parameter is Inactive.
• If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the traction control switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the traction control switch.
2. Test for infinite resistance between the signal terminal F and the ground terminal C with the switch in the open position.
• If not the specified value, replace the traction control switch.
3. Test for less than 3 ohms between the signal terminal F and the ground terminal C with the switch in the closed position.
• If greater than the specified range, replace the traction control switch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Electronic Traction Control Switch Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, programming and setup