U04BA

Invalid Data Received from Switch Input Module A

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Incorrect operation of switches (headlights, power windows, etc.)
Malfunction indicator light comes on
Lack of response to pressing switches
Random operation of functions

Causes

Switch module A fault
Wiring harness damage
Poor contact in connectors
Short circuit in the circuit
Module power problems

How to Fix

Check connections and connectors of switch module A
Check the integrity of the wiring harness
Check power supply and grounding of the module
Scan the system for other fault codes
Replace switch module A if necessary

Related codes

U04BB U04BC U04BD