How is fault code U0422 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Scan every module, not just the engine ECU, and write down anything that comes up alongside it. U0100 and U0140 sitting next to U0422 usually point at a bus or power fault rather than the BCM specifically 2. Check the battery at rest (you want above 12.4V) and watch it under load, then confirm the alternator is charging properly. Low or unstable voltage is the cause more often than people expect 3. Get eyes and fingers on the BCM connectors and harness. Look for green corrosion, pushed-back pins, water marks, and chafing where the loom rubs against metal 4. Clean and check the earth points feeding the BCM. A poor earth gives you exactly this kind of intermittent invalid-data behaviour 5. Do continuity checks on the CAN high and low wires between the BCM and the modules complaining about it, looking for breaks or shorts 6. If the wiring, earths and voltage all check out, compare the BCM software version against the manufacturer's latest, look for any TSBs, then use bi-directional command

Invalid Data Received From Body Control Module

Jump to the fix

Severity

Medium

Can I keep driving?

Usually drivable, but get it diagnosed without delay.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Scan every module, not just the engine ECU, and write down anything that comes up alongside it. U0100 and U0140 sitting next to U0422 usually point at a bus or power fault rather than the BCM specifically 2.

UNetwork
0Generic code
4Network / Communication
22Sequence number

What does it mean?

U0422 is a Network (CAN bus, module communications) fault code. It indicates: Invalid Data Received From Body Control Module (BCM) . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.