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.
Self-Diagnostic System
Ensure all components are connected. Turn ignition switch to RUN position (engine off). Connect scan tool. Check if scan tool communicates with Vehicle Control Module (VCM). Check for PASSLOCK(R) DTCs. See DIAGNOSTIC TROUBLE CODE (DTC) DEFINITIONS table. If more than one code exists, diagnose and repair in order listed in table. See DIAGNOSTIC TESTS.
| DTC (1) | Definition | ||
|---|---|---|---|
| U1016 | Loss of Class 2 Communication With VCM | ||
| U1255 | Class 2 Communication Malfunction | ||
| C0559 | EEPROM Checksum Error | ||
| B2947 | Sensor Power Circuit Low | ||
| B3033 | System Indicates Tamper | ||
| B2960 | Sensor Data Incorrect But Valid | ||
| B2957 | Sensor Data Circuit Low | ||
| B2958 | Sensor Data Circuit High | ||
| B2948 | Sensor Power Circuit High | ||
| B3031 | Controller In Learn Mode | ||
| B0688 | Indicator Circuit High | ||
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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.