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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 660 (TRANSFER CASE - NVG 246-NP8 (2-SPEED AUTOMATIC))DIAGNOSTIC INFORMATION & PROCEDURESDTC C0323: OPEN LOCK CONTROL CIRCUIT OR AN OPEN LOCK FEEDTEST 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 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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)  - Measures for proper voltage on the lock feed circuit.
  2. 3)  - Measures the resistance through the lock control solenoid.
  3. 4)  - Measures for a short to ground in the transfer case lock solenoid.
  4. 5)  - Tests the transfer case lock circuit for a short to ground.
  5. 6)  - Tests the Transfer Case Lock circuit for an open.
  6. 7)  - Repairs the Brake Feed circuit for an open.
Fig 1: DTC C0323 Diagnosis
G01668672Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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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.