U0421: Invalid data arrives from the suspension ride height control unit
Invalid data arrives from the suspension ride height control unit.
| Code | U0421 |
|---|---|
| System | Communication network |
| Group | U04xx, Invalid data between control units |
| Type | Generic: it means the same on every make |
How to read and clear U0421 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see U0421 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- U041D The rocker arm control unit B is sending data that cannot be used
- U041E The all wheel drive control unit is sending data that cannot be used
- U041F The throttle actuator B control unit is sending data that cannot be used
- U0420 The power steering is sending invalid data
- U0422 Invalid data received from the body control module
- U0423 The instrument cluster is sending invalid data
- U0424 The climate control control unit is sending data that cannot be used
- U0425 The auxiliary heater control unit is sending data that cannot be used
- U0401 Invalid data received from the engine control module (ECM/PCM)
- U0402 Invalid data received from the transmission control module
- U0415 Invalid data received from the ABS control module
- U0416 Invalid data received from the vehicle dynamics control module
What does code U0421 mean?
Invalid data arrives from the suspension ride height control unit.
How do you clear U0421?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, U0421 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
