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 Cherokee TrailhawkFACTORY OEM SERVICE PROCEDURE
Module, Adaptive Front Lighting System
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| B167C-92 | FRONT HEADLAMP LEVELING SENSOR - PERFORMANCE OR INCORRECT OPERATION |
| B1680-92 | REAR HEADLAMP LEVELING SENSOR - PERFORMANCE OR INCORRECT OPERATION |
| B1684-96 | LEFT HEADLAMP LEVELING MOTOR CONTROL - COMPONENT INTERNAL FAILURE |
| B1689-96 | RIGHT HEADLAMP LEVELING MOTOR CONTROL - COMPONENT INTERNAL FAILURE |
| B22A9-00 | ECU INTERNAL PERFORMANCE |
| B2866-1C | LEFT HEADLAMP LEVELING MODULE - CIRCUIT VOLTAGE OUT OF RANGE |
| B2879-1C | RIGHT HEADLAMP LEVELING MODULE - CIRCUIT VOLTAGE OUT OF RANGE |
| U0001-88 | CAN C BUS OFF |
| U0002-00 | CAN C BUS OFF PERFORMANCE |
| U0037-86 | LIN BUS-SIGNAL INVALID |
| U0037-88 | LIN BUS-BUS OFF |
| U0100-00 | LOST COMMUNICATION WITH ECM/PCM |
| U0121-00 | LOST COMMUNICATION WITH BSM BRAKE SYSTEM MODULE NODE ABSENT |
| U0140-00 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| U0401-00 | IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM |
| U0415-00 | INVALID DATA RECEIVED FROM ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE |
| U0422-00 | IMPLAUSIBLE DATA RECEIVED FROM BODY CONTROL MODULE |
| U1102-00 | LOST COMMUNICATION WITH LEFT HEADLAMP LEVELING CONTROL MODULE |
| U1103-00 | LOST COMMUNICATION WITH RIGHT HEADLAMP LEVELING CONTROL 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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