C1442

DTC C1442 or C1443

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 Descriptors
DTC C1442
- Invalid Data Received from Yaw Rate Sensor

DTC C1443
- Invalid Data Received from Deceleration Sensor

Circuit/System Description

The electronic brake control module (EBCM) monitors the deceleration of the vehicle for Antilock Brake System (ABS) operation.

The traction control module receives signals from the yaw rate and acceleration sensor via the CAN communication system.

The yaw rate sensor has a built-in acceleration sensor and detects the vehicle condition.

Conditions for Running the DTC

Ignition is in the ON position

Conditions for Setting the DTC

C1442

An invalid data signal is received from the acceleration sensor for 10 seconds or more.

C1443

An invalid data signal is received from the yaw rate sensor for 10 seconds or more.

Action Taken When the DTC Sets

* The ABS is disabled.
* The ABS warning indicator turns ON.
* The traction control and vehicle stability control (VSC) is disabled.
* The VSC warning indicator turns ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector Views)
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

1. Verify DTC U0123, U0124, or U0126 are not set.

• If DTC U0123, U0124, or U0126 is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

2. Verify yaw rate sensor is correctly installed.

• If yaw rate sensor is not correctly installed, correct installation of yaw rate sensor and using a scan tool perform yaw rate sensor calibration.

3. If yaw rate sensor is correctly installed, replace EBCM.

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for EBCM replacement, setup, and programming