C1227

DTC C1207-C1210, C1221-C1228, or C1232-C1235

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 C1207 00
- Left Front Wheel Speed Sensor Circuit High Input Malfunction

DTC C1208 00
- Right Front Wheel Speed Sensor Circuit High Input Malfunction

DTC C1209 00
- Left Rear Wheel Speed Sensor Circuit High Input Malfunction

DTC C1210 00
- Right Rear Wheel Speed Sensor Circuit High Input Malfunction

DTC C1221 00
- Left Front Wheel Speed Sensor Circuit Malfunction

DTC C1222 00
- Right Front Wheel Speed Sensor Circuit Malfunction

DTC C1223 00
- Left Rear Wheel Speed Sensor Circuit Malfunction

DTC C1224 00
- Right Rear Wheel Speed Sensor Circuit Malfunction

DTC C1225 00
- Left Front Wheel Speed Sensor Circuit Performance Malfunction

DTC C1226 00
- Right Front Wheel Speed Sensor Circuit Performance Malfunction

DTC C1227 00
- Left Rear Wheel Speed Sensor Circuit Performance Malfunction

DTC C1228 00
- Right Rear Wheel Speed Sensor Circuit Performance Malfunction

DTC C1232 00
- Left Front Wheel Speed Sensor Circuit Low Input Malfunction

DTC C1233 00
- Right Front Wheel Speed Sensor Circuit Low Input Malfunction

DTC C1234 00
- Left Rear Wheel Speed Sensor Circuit Low Input Malfunction

DTC C1235 00
- Right Rear Wheel Speed Sensor Circuit Low Input Malfunction

Circuit/System Description

The wheel speeds are detected by active wheel speed sensors. Each wheel speed sensor receives a 12 V reference voltage from the electronic brake control module (EBCM) and provides an alternating current square wave signal to the EBCM. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed. The EBCM sends the wheel speed information as a high speed controller area network (CAN) serial data message.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

A supervised periodic message that includes the wheel speed serial data has not been received.

Action Taken When the DTC Sets

Specific subsystems will not function or operate in degraded mode.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Reference Information
Schematic Reference

Antilock Brake System Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

ABS Description and Operation (Description and Operation)
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 (Programming and Relearning)for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool EBCM Wheel Speed Sensor parameters. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 MPH).

Circuit/System Testing

1. Ignition ON, verify that DTC C0035, C0040, C0045, or C0050 is not present in the EBCM.

• If any listed DTC is present, refer to DTC C0035, C0040, C0045, or C0050 (C0035) to diagnose that DTC prior to this diagnostic.

2. Replace the K17 Electronic Brake Control Module (EBCM) and verify the DTC does not reset.

• If the DTC resets, replace the module that set the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning)for module replacement, setup and programming