C0299

DTC C0299

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 C0299
- Brake Booster Performance




Circuit/System Description

The electronic brake control module (EBCM) monitors the vacuum level in the power brake booster, and will set a DTC if the vacuum is too low.


Conditions for Running the DTC

* The ignition is ON.
* Ignition voltage is greater than 9 volts.
* The engine is running for the vacuum related fault to set.



Conditions for Setting the DTC

* A condition in which no vacuum is detected in the power brake booster for approximately 10 seconds after start-up.
* A condition in which low vacuum is detected in the power brake booster for approximately 60 seconds or longer after start-up, or is detected while driving.



Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM automatically 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
Description and Operation Reference

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs
* Connector Repairs

Scan Tool Reference

Control Module References


Circuit/System Verification

1. Verify that a vacuum leak is not present, refer to Brake Assist System Diagnosis (Component Tests and General Diagnostics) .
2. Verify that DTC C1100 is not set.


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