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.
2021 Jeep Grand Cherokee TrackhawkFACTORY OEM SERVICE PROCEDURE
Module, Adaptive Front Lighting System
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| B167D-00 | FRONT HEADLAMP LEVELING SENSOR CIRCUIT PERFORMANCE |
| B1681-00 | REAR HEADLAMP LEVELING SENSOR CIRCUIT PERFORMANCE |
| B1684-01 | LEFT HEADLAMP LEVELING MOTOR CONTROL - GENERAL ELECTRICAL FAILURE |
| B1684-77 | LEFT HEADLAMP LEVELING MOTOR CONTROL - COMMANDED POSITION NOT REACHABLE |
| B1689-01 | RIGHT HEADLAMP LEVELING MOTOR CONTROL - GENERAL ELECTRICAL FAILURE |
| B1689-77 | RIGHT HEADLAMP LEVELING MOTOR CONTROL - COMMANDED POSITION NOT REACHABLE |
| B2204-00 | ECU CONFIGURATION MISMATCH |
| B22A4-00 | ADAPTIVE FRONT LIGHTING SYSTEM NOT CALIBRATED |
| B286A-01 | LEFT HEADLAMP SWIVELING MOTOR - GENERAL ELECTRICAL FAILURE |
| B286A-2A | LEFT HEADLAMP SWIVELING MOTOR - STUCK |
| B286B-01 | LEFT HEADLAMP SWIVELING POSITION SENSOR - GENERAL ELECTRICAL FAILURE |
| B2876-01 | RIGHT HEADLAMP SWIVELING MOTOR - GENERAL ELECTRICAL FAILURE |
| B2876-2A | RIGHT HEADLAMP SWIVELING MOTOR - STUCK |
| B2877-01 | RIGHT HEADLAMP SWIVELING POSITION SENSOR - GENERAL ELECTRICAL FAILURE |
| B287E-16 | LEFT HEADLAMP MODULE - CIRCUIT VOLTAGE BELOW THRESHOLD |
| B287E-17 | LEFT HEADLAMP MODULE - CIRCUIT VOLTAGE ABOVE THRESHOLD |
| B287F-16 | RIGHT HEADLAMP MODULE - CIRCUIT VOLTAGE BELOW THRESHOLD |
| B287F-17 | RIGHT HEADLAMP MODULE - CIRCUIT VOLTAGE ABOVE THRESHOLD |
| U0001-00 | CAN C BUS |
| U0002-00 | CAN C BUS OFF PERFORMANCE |
| U0100-00 | LOST COMMUNICATION WITH ECM/PCM |
| U0101-00 | LOST COMMUNICATION WITH TCM |
| U0121-00 | LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE |
| U0132-00 | LOST COMMUNICATION WITH SUSPENSION CONTROL MODULE |
| U0140-00 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| U0212-00 | LOST COMMUNICATION WITH STEERING COLUMN CONTROL MODULE |
| U0421-00 | IMPLAUSIBLE DATA RECEIVED FROM SUSPENSION CONTROL MODULE |
| U1221-00 | LOST COMMUNICATION WITH LEFT HEADLAMP MODULE |
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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