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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1843 (DTC INDEX)TRANSFER CASE (NVG 226-NP8) DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Transfer Case (NVG 226-NP8) DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Transfer Case (NVG 226-NP8) DTCS
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
TRANSFER CASE (NVG 226-NP8) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B0770 | All Wheel Drive (AWD) Indicator Circuit |
| DTC B0775 | Four Wheel Drive High Range (4HI) Indicator Circuit |
| DTC B0780 | Four Wheel Drive Low Range (4LO) Indicator Circuit |
| DTC B0785 | Two Wheel Drive High Range (2HI) Indicator Circuit |
| DTC B0790 | Transfer Case Neutral Indicator Circuit |
| DTC B2725 | ATC Mode Switch Circuit Malfunction |
| DTC C0300 | Rear Speed Sensor Malfunction |
| DTC C0305 | Front Speed Sensor Malfunction |
| DTC C0306 | Motor A or B Circuit |
| DTC C0321 | Transfer Case Lock Circuit |
| DTC C0327 | Encoder Circuit Malfunction |
| DTC C0359 | Four Wheel Drive Low Range (4LO) Discrete Output Circuit |
| DTC C0374 | General System Malfunction |
| DTC C0379 | Front Axle System |
| DTC C0550 | ECU Malfunction |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.