NetworkU040F
SeriousSeverity: Serious - have it checked soon
Invalid data received from reductant control module
Key terms: Control module: a small computer that runs one part of the car
1What it means in plain English
Control modules in the car cannot communicate with each other over the vehicle network.
2Common causes
- Wiring or connector fault on the communication bus
- Faulty control module
- Low battery voltage or poor ground
- Water ingress in a connector or module
- Aftermarket device interfering with the bus
3Can I drive?
The car may run normally or may not run at all. If the module that has lost communication controls steering, brakes, park brake, charging or engine cooling, drive only if those systems feel normal; stop safely if the steering becomes heavy, a brake warning appears, or the engine temperature climbs. If the car will not start or runs badly, have it towed.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 26
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | U040F | Aerodynamic Control. Control Module D. Power Mode. Open Circuit Brand | Network |
| BAIC Motor | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| BYD | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Chery | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Daewoo | U040F | No description available | Network |
| DFFS | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| DFFX | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| DFXK | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| EOBD | U040F | Vigased andmed taastootmise juhtmoodulist Brand | Network |
| Ford | U040F | No description available | Network |
| Geely | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| GM | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Great Wall | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Hafei | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Holden | U040F | No description available | Network |
| Hyundai | U040F | No description available | Network |
| Isuzu | U040F | No description available | Network |
| Land Rover | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Mahindra | U040F | No description available | Network |
| Opel | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Peugeot | U040F | No description available | Network |
| Saab | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| MG (SAIC) | U040F | Invalid Data Received From Reductant Control Module Brand | Network |
| Suzuki | U040F | Error status of SCR node Brand | Network |
| Tata | U040F | No description available | Network |
| Toyota | U040F | Invalid data received from reductant control module Brand | Network |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 21
These 7-character codes are manufacturer-specific variants of U040F and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | U040F86 | CAN communication: number of elements usage information signal error Brand | Network |
| SsangYong | U040F87 | CAN communication: Drive Control Unit (DCU) message error - air temperature signal Brand | Network |
| SsangYong | U040FE0 | Transmission of CAN message default value to ECU external device (drive control unit diagnosis) Brand | Network |
| SsangYong | U040FE3 | ECU differential speed CAN message default value transmission (drive control unit diagnosis) Brand | Network |
| SsangYong | U040FE4 | ECU coolant temperature CAN message default value transmission (drive control unit diagnosis) Brand | Network |
| SsangYong | U040FE5 | ECU engine speed CAN message default value transmission (drive control unit diagnosis) Brand | Network |
| SsangYong | U040FE7 | ECU Selective Catalytic Reduction (SCR) entrance CAN message default value transmission (drive control unit diagnosis) Brand | Network |
| SsangYong | U040FE9 | ECU LAT-ACCEL CAN message default value transmission (drive control unit diagnosis) Brand | Network |
| SsangYong | U040FEA | ECU LONG-ACCEL CAN message default value transmission (drive control unit diagnosis) Brand | Network |
| SsangYong | U040FF1 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF2 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF3 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF4 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF5 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF6 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF7 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF8 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FF9 | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FFA | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FFB | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
| SsangYong | U040FFC | CAN communication: Drive Control Unit (DCU) message error Brand | Network |
6Related codes
Browse Uxxx codes or U040xx codes.