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 1842 (DTC INDEX)THEFT DETERRENT DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Theft Deterrent DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Theft Deterrent DTCS
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
THEFT DETERRENT DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B2947 | Short To Ground On Passlock™ Sensor Power Circuit |
| DTC B2948 | Sensed Battery Voltage |
| DTC B2957 | BCM Signal Input Voltage Low |
| DTC B2958 | BCM Signal Input Voltage High |
| DTC B2960 | Valid But Different Code Value Than Previously Learned From Passlock™ Sensor |
| DTC B3031 | BCM In Learn Mode But Does Not See A Valid Passlock™ Sensor Code |
| DTC B3033 | BCM Is Reading A Tamper Code From Passlock™ Sensor |
| DTC P1626 | PCM Has Not Established Communications With BCM |
| DTC P1631 | PCM Did Not Receive A Valid Password |
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.