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.
1998 GMC Jimmy 2D Utility, RWD, AutomaticFACTORY OEM SERVICE PROCEDURE
TBC Module DTC Definitions
TBC MODULE DTC DEFINITIONS
| DTC | Circuit Affected | ||
|---|---|---|---|
| B1397 | 5-Volt Reference Circuit Low | ||
| B1398 | 5-Volt Reference Circuit High | ||
| B1477 | RAP Circuit Low | ||
| B1478 | RAP Circuit High | ||
| B1480 | Inadvertent Power Circuit Malfunction | ||
| B2527 | Front Foglight Circuit Low | ||
| B2537 | Rear Foglight Circuit Low (Export Only) | ||
| B2575 | Headlight Request/Feedback Mismatch | ||
| B2577 | Headlight Control Circuit Low | ||
| B2585 | Park Light Control Circuit Malfunction | ||
| B2600 | Daytime Running Light Circuit Malfunction | ||
| B2613 | Dimming Potentiometer Circuit High | ||
| B2617 | Courtesy Light Circuit Low | ||
| B2618 | Courtesy Light Circuit High | ||
| B2647 | Ambient Light Sensor Circuit Low | ||
| B2648 | Ambient Light Sensor Circuit High | ||
| B2752 | Horn Relay Coil Circuit Low | ||
| B2947 (1) | Security System Sensor Power Circuit Low | ||
| B2948 (1) | Security System Sensor Power Circuit High | ||
| B2957 (1) | Security System Sensor Circuit Low | ||
| B2958 (1) | Security System Sensor Circuit High | ||
| B2960 (1) | Security System Sensor Data Incorrect But Valid | ||
| B2961 | Ignition 1 - Key In/Out Mismatch | ||
| B3031 (1) | Security System Controller In Learn Mode | ||
| B3033 (1) | Security System Indicates Tamper | ||
| B3102 | Keyless Entry (RFA) Data Link Circuit Low | ||
| B3137 | Door Lock Circuit Low | ||
| B3138 | Door Lock Circuit High | ||
| B3147 | Passenger Door Unlock Circuit Low | ||
| B3148 | Passenger Door Unlock Circuit High | ||
| U1255 | Class 2 Communication Malfunction | ||
| U1301 | Class 2 Data Link High | ||
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Factory Service Tools
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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.
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