NetworkU0420
SeriousSeverity: Serious - have it checked soon
Invalid Data Received From Power Steering Control Module A
Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list
Safety: This code relates to the steering system. Power steering assistance may be reduced or fail.
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?
Serious · drive with care
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 33
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| BAIC Motor | U0420 | CAN signal reception error Brand | Network |
| Mercedes-Benz | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| BYD | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Chery | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Chrysler | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Daewoo | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| DFFS | U0420 | TCU signal invalid Brand | Network |
| DFFX | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| DFXK | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| EOBD | U0420 | Ugyldige data modtaget fra servostyringsmodul 'A' Brand | Network |
| Fiat | U0420 | Invalid data received from power steering control module Brand | Network |
| Geely | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| GM | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Great Wall | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Hafei | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Holden | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Honda | U0420 | 68 (EPS control unit malfunction) (Autopilot camera) Fault location and cause estimation: The EPS detected a fault Brand | Network |
| Hyundai | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| Land Rover | U0420 | DTC -68 (CHCM) invalid data received from Brand | Network |
| Maserati | U0420 | Invalid data received from Power Steering Control (PSC) module A - invalid signal Brand | Network |
| Mitsubishi | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| Opel | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Peugeot | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| Proton | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| Saab | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| MG (SAIC) | U0420 | Power Steering Control Module(EPS) Receive Invalid Data Brand | Network |
| Sprinter | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| Subaru | U0420 | Invalid Data Received From Power Steering Control Module A SAE | Network |
| Suzuki | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Tata | U0420 | Invalid Data Received From Power Steering Control Module Brand | Network |
| Toyota | U0420 | TCU signal invalid Brand | Network |
| Volkswagen | U0420 | SAE: Invalid Data Received from Power Steering 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 23
These 7-character codes are manufacturer-specific variants of U0420 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | U042000 | Implausible data were received from control unit 'Power steering'. Brand | Network |
| SsangYong | U042000 | CAN bus: EPS no signal Brand | Network |
| Mercedes-Benz | U042008 | Implausible data were received from control unit 'Power steering'. There is a signal fault or the message is faulty. Brand | Network |
| Mercedes-Benz | U042029 | Das EPS-Steuergerät sendet ungültige Daten, einen Fehlerzustand oder Daten mit zu altem Zeitstempel. Brand | Network |
| Mercedes-Benz | U042064 | Das Signal INP_HLC_Ifc_Stat_EPS vom EPS SG ist unplausibel zum Signal INP_HLC_Ifc_Stat_EPS_Bckp vom EPS SG Brand | Network |
| Mercedes-Benz | U042086 | Communication Error EPS Brand | Network |
| SsangYong | U042086 | CAN communication: Steering Angle Sensor (SAS) signal error Brand | Network |
| SsangYong | U042087 | CAN Timeout of SAS Unit Brand | Network |
| Mercedes-Benz | U04208F | Das EPS-Steuergerät sendet Daten mit zu altem Zeitstempel. Brand | Network |
| Mercedes-Benz | U0420E0 | Die Signale INP_PLC_HandsOff_Stat_EPS und INP_EPS_StWhl_Trq vom EPS zeigen einen Fehler an oder sind unplausibel. Brand | Network |
| Mercedes-Benz | U0420E1 | Botschaft vom EPS-Steuergerät zeigt einen Fehler im Botschaftszähler oder CRC-Fehler Brand | Network |
| Mercedes-Benz | U0420E2 | Botschaften vom EPS-SG (Elektronic Power Steering) führen in der IDC zu einem kumulierten Fehler. Brand | Network |
| Mercedes-Benz | U0420E3 | Der Lenkwinkel des EPS-Steuergerätes ist noch nicht abgeglichen oder der Zeitstempel ist fehlerhaft Brand | Network |
| Mercedes-Benz | U0420E4 | Das Signal INP_EPS_FtWhlAngl_Stat_Bckp des EPS-Steuergerätes zeigt einen Fehler an Brand | Network |
| Mercedes-Benz | U0420E5 | Das Signal INP_HLC_Fo_Stat_EPS oder INP_HLC_Fo_Stat_Bckp des EPS-Steuergerätes zeigt einen Fehler an Brand | Network |
| Mercedes-Benz | U0420E6 | Das Signal INP_PLC_Stat_EPS des EPS-Steuergerätes zeigt einen Fehler an Brand | Network |
| Mercedes-Benz | U0420E7 | Das Signal INP_EPS_StWhl_Trq_Stat wird mit einem ungültigem Wert empfangen Brand | Network |
| Mercedes-Benz | U0420E8 | Das Signal EPS_FtWhlAngl_Stat_ST3 wird mit einem ungültigem Wert empfangen Brand | Network |
| Mercedes-Benz | U0420E9 | Das FlexRay-Signal PPS_Stat_EPS vom EPS-SG ist fehlerhaft Brand | Network |
| Mercedes-Benz | U0420EA | Das FlexRay-Signal DTQ_Stat_EPS vom EPS-SG ist fehlerhaft. Brand | Network |
| Mercedes-Benz | U0420EB | Das FlexRay-Signal DTQ_Can_Stat vom EPS-SG ist fehlerhaft Brand | Network |
| Mercedes-Benz | U0420EC | Das EPS-SG zeigt unplausiblen Hands-Off Status im Signal DTQ_HandsOff_Stat_EPS an Brand | Network |
| Mercedes-Benz | U0420FA | Steering Angle Error Brand | Network |
6Related codes
Browse Uxxx codes or U042xx codes.