Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1916 (TRANSFER CASE - GETRAG 760)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0394CIRCUIT/SYSTEM TESTING
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Circuit/System Testing
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector X2 at the rear differential clutch control module.
- Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 2 and ground.
- If the test lamp illuminates, test the signal circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the signal circuit terminal 2 and ground.
- If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the rear wheel drive module clutch housing.
- Test for 310-113K ohms of resistance between the signal circuit terminal 2 and the low reference circuit terminal 4.
- If less than the specified range, test both circuits for a short together. If the circuits test normal, replace the rear wheel drive module clutch housing.
- If greater than the specified range, test both circuits for an open/high resistance. If the circuits test normal, replace the rear wheel drive module clutch housing.
- If all circuits test normal, replace the CCM.
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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.