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.
DTC U1001-U1254: Notes
The module ID Number list provides a method for determining which module is not communicating. A module with an internal class 2 serial data circuit malfunction or which loses power during the current ignition cycle would have a Lost Communication DTC set by other modules. Use the module ID Number list in order to determine which module is not communicating and the DTC U1001-U1254 diagnostic table in order to diagnose the malfunction.
| System | ID Number |
|---|---|
| Powertrain Control Module (PCM) | 016 |
| Electronic Brake Control Module (EBCM) | 040 |
| Electronic Suspension Control (ESC) | 056 |
| Body Control Module (BCM) | 064 |
| Inflatable Restraint Sensing and Diagnostic Module (SDM) | 088 |
| Instrument Panel Cluster (IPC) | 096 |
| Radio | 128 |
| HVAC | 153 |
| Driver Door Module (DDM) | 160 |
| Passenger Door Module (PDM) | 161 |
| Seat Control Module (SCM) | 166 |
| Remote Control Door Lock Receiver (RCDLR) | 176 |
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.