U0422
System
Network (CAN Bus)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Invalid Data Received From Body Control Module

Understand U0422, common causes, and the right SEAFLO pump to diagnose it.

BCM sending implausible data on the network — other modules cannot trust body system messages.

Common symptoms

  • Random electrical gremlins
  • Warning lights
  • Windows/locks behaving erratically

Typical causes

  • BCM internal fault
  • Low voltage affecting BCM
  • Corrupted BCM software
  • Water in BCM

What scanner do you need?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Frequently asked questions

Can I diagnose U0422 with a basic code reader?
U0422 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with U0422?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.