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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 989 (POWER STEERING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0294TEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step checks to see if both values are changing.
  2. 3:  This step checks to see which parameter was not changing.
  3. 4:  This step checks for proper connection of BPP sensor harness connector.
  4. 6:  This step checks for proper connection of stop lamp switch harness connector.
DTC C0294

Step Action Yes No
Schematic Reference: Power Steering System Schematics 
Connector End Views Reference: Power Steering System Connector End Views 
1 Did you perform the electro-hydraulic power steering (EHPS) Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Power Steering System 
2 
  1. Install a scan tool.
  2. Using the scan tool, observe the Brake Pedal Travel and the brake pedal position (BPP) sensor Output Volts parameters, while pressing down on the brake pedal.
Do the observed readings change accordingly when the brake pedal is depressed?		 Go to Diagnostic Aids Go to Step 3 
3  Is the BPP sensor Output Volts parameter not changing along with the Brake Pedal Travel parameter? Go to Step 4  Go to Step 6 
4  Inspect for poor connections at the harness connector of the BPP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 7  Go to Step 5 
5
IMPORTANT: Always perform the calibration procedure for the BPP sensor. Refer to Brake Pedal Position Sensor Calibration Description and Operation .
Replace the BPP sensor. Refer to Brake Pedal Position Sensor Replacement .Did you complete the replacement?		 Go to Step 8  -
6  Inspect for poor connections at the harness connector of the stop lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 8  Go to Step 7 
7 Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Lighting Systems.
Did you complete the replacement?		 Go to Step 8  -
8
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.