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.
2011 Chevrolet CapriceFACTORY OEM SERVICE PROCEDURE
Control Module U Code List
This list includes all Data Communications related U-code DTCs in alphanumeric order with descriptors for all modules. Not all DTCs listed will be applicable to all vehicles.
Control Module U Code List
| DTC | DTC Descriptor |
|---|---|
| U0020 | Low Speed CAN - Bus Communication Range/Performance |
| U0073 00 | CAN - Bus Off |
| U0073 71 | Low Speed CAN - Bus Off |
| U0073 72 | High Speed CAN - Bus Off |
| U0074 00 | Control Module Communication Bus B Off |
| U0100 | CAN - Bus No Communication with ECM (Engine Control Module) |
| U0101 | CAN - Bus No Communication with TCM (Transmission Control Module) |
| U0104 | CAN - Bus No Communication with Cruise Control |
| U0105 | Lost Communication with Fuel Injector Control Module |
| U0108 | CAN - Bus No Communication with Alternative Fuel Control Module |
| U0109 | CAN - Bus No Communication with FPCM (Fuel Pump Control Module) |
| U0121 | CAN - Bus No Communication with EBCM (Electronic Brake Control Module) |
| U0122 | CAN - Bus No Communication with ESCM (Electronic Suspension Control Module) |
| U0125 | CAN - Bus No Communication with Multi-axis Acceleration Sensor Module |
| U0126 | CAN - Bus No Communication with SAS (Steering Angle Sensor) |
| U0131 | CAN - Bus No Communication with Power Steering Control Module |
| U0132 | CAN - Bus No Communication with Ride Level Control Module |
| U0134 | CAN - Bus No Communication with Power Steering Control Module - Rear |
| U0140 | CAN - Bus No Communication with BCM (Body Control Module) |
| U0147 | CAN - Bus No Communication with NIM (Navigation Interface Module) |
| U0151 | CAN - Bus No Communication with SDM (Sensing and Diagnostic Module, Airbag |
| U0155 | CAN - Bus No Communication with IPC (Instrument Panel Cluster) |
| U0157 | CAN - Bus No Communication with SIC (Driver Information Display) |
| U0158 | CAN - Bus No Communication with Head Up Display |
| U0159 | CAN - Bus No Communication with Park Assist Control Module |
| U0160 | CAN - Bus No Communication with Audible Alert Control Module |
| U0164 | CAN - Bus No Communication with HVAC (Heating, Ventilation, and Cooling) Control Module |
| U0168 | CAN - Bus No Communication with Immobilizer |
| U0170 | CAN - Bus No Communication with Restraints System Sensor A |
| U0181 | CAN - Bus No Communication with AHLL (Automatic Headlamp Leveling) Control Module |
| U0184 | CAN - Bus No Communication with Audio System IRC (Integrated Radio Chassis) |
| U0186 | CAN - Bus No Communication with Audio Amplifier |
| U0198 | CAN - Bus No Communication with Telematics Control Module |
| U0214 | CAN - Bus No Communication with RFA (Remote Function Actuator) |
| U0249 | CAN - Bus No of Communication with RSE (Rear Seat Entertainment) |
| U1304 00 | CAN - Bus No Communication with SIM (Seat Interface Module) |
| U1401 72 | No Communication with MSM (Memory Seat and Mirror Module) |
| U1814 | Powertrain High Speed CAN - Bus Communication Enable Circuit |
| U185D | Fuel Injector Control Module Lost Communication with Engine Control Module |
| U185E | Fuel Injector Control Module Lost Communication with Body Control Module |
| U2099 | High Speed CAN - Bus Communication Enable Circuit |
| U2100 | CAN - Bus Communication |
| U2121 | (IRC) Lost Communications with Radio Display |
| U2121 | (NIM) No Comms with Radio Display |
| U2201 | No Communication with DVD Player |
| U2202 | No Communication with Rear Control Panel |
| U2203 | No Communication with Screen 1 |
| U2204 | No Communication with Screen 2 |
| U2400 | Fuel Injector Control Module High Speed CAN Bus Off |
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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