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TuningBot DTC Database · v4.37.14

U0421 Invalid data received - suspension ride height control module

Generic (OBD-II) interpretation in the TuningBot DTC database.

U · NetworkNetworkOBD2

What U0421 means

U0421
Invalid data received - suspension ride height control module Generic · network Data confidence 78%

The control module registered the fault condition described as "Invalid data received - suspension ride height control module".

Symptoms

  • Multiple warning lamps possible
  • Functions of the affected module unavailable

Possible causes

  • CAN bus wiring fault (open, short, chafed harness)
  • Faulty control module loading the bus
  • Connector or terminal corrosion
  • Power supply or ground fault of a module

Recommended checks

  • Perform a full-module scan to map which modules communicate
  • Check CAN bus resistance and voltages at the diagnostic connector
  • Inspect wiring and connectors of the affected module
  • Check module power supply and grounds
  • Disconnect suspect modules one at a time only with a documented procedure

Related and nearby codes

U04 range
U0400U0401U0402U0403U0404U0405U0406U0407U0408U0409U040AU040BU040CU040DU040EU040FU0410U0411

How to read U0421

U

Network: communication between control units.

0

Generic SAE-standard code: same meaning on every make.

421

Specific fault index within the subsystem.

Frequently asked questions about U0421

What does U0421 mean?

Invalid data received - suspension ride height control module. The control module registered the fault condition described as "Invalid data received - suspension ride height control module".

Is U0421 generic or manufacturer-specific?

U0421 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0421 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0421 is removable in your case.

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