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
Cluster, Instrument
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| B1612-00 | PANEL ILLUMINATION CONTROL |
| B21DD-84 | SYSTEM VOLTAGE-SIGNAL BELOW ALLOWABLE RANGE |
| B21DD-85 | SYSTEM VOLTAGE - SIGNAL VOLTAGE ABOVE ALLOWABLE RANGE |
| B275B-00 | AIRBAG TELLTALE |
| 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 |
| U0104-00 | LOST COMMUNICATION WITH CRUISE CONTROL MODULE |
| U0114-00 | LOST COMMUNICATION WITH FINAL DRIVE CONTROL MODULE |
| U0121-00 | LOST COMMUNICATION WITH ANTI LOCK BRAKE SYSTEM (ABS) CONTROL MODULE |
| U0127-00 | LOST COMMUNICATION WITH TIRE PRESSURE MONITOR MODULE |
| U0131-00 | LOST COMMUNICATION WITH ELECTRIC POWER STEERING CONTROL MODULE |
| U0140-00 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| U0151-00 | LOST COMMUNICATION WITH OCCUPANT RESTRAINT CONTROLLER (ORC) |
| U0159-00 | LOST COMMUNICATION WITH PARKING ASSIST CONTROL MODULE |
| U0212-00 | LOST COMMUNICATION WITH STEERING COLUMN CONTROL MODULE |
| U0405-00 | INVALID DATA RECEIVED FROM CRUISE CONTROL MODULE |
| U11B9-00 | LOST COMMUNICATION WITH RF HUB |
| U1464-00 | IMPLAUSIBLE DATA RECEIVED FROM EPS STEERING TORQUE |
| U1478-00 | IMPLAUSIBLE DATA RECEIVED FROM EMERGENCY ALERT 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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