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 MANUALSJEEP2023WAGONEER SERIES II, RWDREPAIR AND DIAGNOSISBODY & FRAMETOWING SYSTEMSTRAILER TOW MODULE (TTM) - DIAGNOSTIC CODE INDEXDIAGNOSTIC CODE INDEX
2023 Jeep Wagoneer Series II, RWD
Diagnostic Code Index
2023 Jeep Wagoneer Series II, RWDSECTION Diagnostic Code Index
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| B166A-11 | LEFT TRAILER TOW LAMP CONTROL - CIRCUIT SHORT TO GROUND |
| B166A-12 | LEFT TRAILER TOW LAMP CONTROL - CIRCUIT SHORT TO BATTERY |
| B166A-13 | LEFT TRAILER TOW LAMP CONTROL - CIRCUIT OPEN |
| B166E-11 | RIGHT TRAILER TOW LAMP CONTROL - CIRCUIT SHORT TO GROUND |
| B166E-12 | RIGHT TRAILER TOW LAMP CONTROL - CIRCUIT SHORT TO BATTERY |
| B166E-13 | RIGHT TRAILER TOW LAMP CONTROL - CIRCUIT OPEN |
| B16BB-11 | TRAILER STOP LAMP CONTROL - CIRCUIT SHORT TO GROUND |
| B16BB-12 | TRAILER STOP LAMP CONTROL - CIRCUIT SHORT TO BATTERY |
| B16BB-13 | TRAILER STOP LAMP CONTROL - CIRCUIT OPEN |
| B17AD-11 | REAR LEFT TRAILER TURN LAMP CONTROL - CIRCUIT SHORT TO GROUND |
| B17AD-12 | REAR LEFT TRAILER TURN LAMP CONTROL - CIRCUIT SHORT TO BATTERY |
| B17AD-13 | REAR LEFT TRAILER TURN LAMP CONTROL - CIRCUIT OPEN |
| B17B1-11 | REAR RIGHT TRAILER TURN LAMP CONTROL - CIRCUIT SHORT TO GROUND |
| B17B1-12 | REAR RIGHT TRAILER TURN LAMP CONTROL - CIRCUIT SHORT TO BATTERY |
| B17B1-13 | REAR RIGHT TRAILER TURN LAMP CONTROL - CIRCUIT OPEN |
| B17C5-11 | TRAILER TOW REVERSE LAMP CONTROL - CIRCUIT SHORT TO GROUND |
| B17C5-12 | TRAILER TOW REVERSE LAMP CONTROL - CIRCUIT SHORT TO BATTERY |
| B17C5-13 | TRAILER TOW REVERSE LAMP CONTROL - CIRCUIT OPEN |
| B17C9-11 | TRAILER TOW REAR FOG LAMP CONTROL - CIRCUIT SHORT TO GROUND |
| B17C9-12 | TRAILER TOW REAR FOG LAMP CONTROL - CIRCUIT SHORT TO BATTERY |
| B17C9-13 | TRAILER TOW REAR FOG LAMP CONTROL - CIRCUIT OPEN |
| B235C-64 | TRAILER CONNECTION - SIGNAL PLAUSIBILITY FAILURE |
| C2129-16 | BATTERY VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD |
| C2129-17 | BATTERY VOLTAGE - CIRCUIT VOLTAGE ABOVE THRESHOLD |
| C2213-00 | TRAILER BRAKE MODULE INTERNAL |
| C2213-42 | TRAILER BRAKE MODULE INTERNAL - GENERAL MEMORY FAILURE |
| C2214-00 | ITBM NOT CALIBRATED |
| U0019-00 | CAN B BUS |
| U0121-00 | LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE "A" |
| U0140-00 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| U0155-00 | LOST COMMUNICATION WITH CLUSTER-CCN |
| U0415-00 | INVALID DATA RECEIVED FROM ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE "A" |
| U0422-00 | IMPLAUSIBLE DATA RECEIVED FROM BODY CONTROL MODULE |
| U1601-00 | ECU APPLICATION SOFTWARE CODE 1 MISSING OR CORRUPTED |
RENDER: 1.0x
NO RELATED
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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.