U0422 Code — Invalid Data Received From Body Control Module (BCM) #

U0422 means that a control module has received data from the Body Control Module (BCM) that it considers invalid, implausible, corrupted or inconsistent.

This distinction is important. U0422 does not automatically mean that the BCM has failed, and it does not simply mean that communication with the BCM has been lost.

The correct diagnostic approach depends heavily on which module stored U0422, what other fault codes are present and which BCM-related data was considered invalid.

U0422 at a glance #

What does U0422 actually mean? #

Modern vehicles exchange information between multiple electronic control modules. The Body Control Module commonly manages or monitors functions such as lighting, door locks, windows, wipers, security systems and numerous switches and status signals.

Other modules rely on information transmitted by the BCM. U0422 is stored when a receiving module decides that BCM-related information is not valid or plausible according to its diagnostic strategy.

The precise piece of information that triggered U0422 can vary significantly between vehicle manufacturers and models. For that reason, the code should not be diagnosed from its generic description alone.

U0422 vs U0140: invalid data is not the same as lost communication #

U0422 — Invalid data received from the BCM #

The vehicle network may still be operating and BCM messages may still be present, but a receiving module considers some of the information invalid, corrupted or implausible.

U0140 — Lost communication with the BCM #

U0140 indicates that expected communication with the Body Control Module has been lost.

This difference changes the diagnostic approach. A U0140 fault places greater emphasis on BCM power, ground and network availability. With U0422, the validity of the information being transmitted, related DTCs, configuration and vehicle-specific diagnostic data become especially important.

Possible symptoms of U0422 #

Symptoms depend on the vehicle and on the module that stored the code. U0422 may sometimes be stored with few or no symptoms.

Possible symptoms include:

• one or more warning messages or warning lights;
• body electrical functions operating incorrectly;
• intermittent lighting, locking, window or wiper problems;
• security or keyless-entry problems on some vehicles;
• other communication-related U-codes;
• features disabled because another module considers BCM information unreliable;
• no obvious driver complaint when the code is stored only as history.

Common diagnostic areas for U0422 #

There is no single component that causes U0422 on every vehicle. The following areas should be investigated according to the complete scan results and the manufacturer’s diagnostic information.

1. Other fault codes in the BCM #

Start by checking whether the BCM itself has stored more specific DTCs.

A sensor, switch, power-supply or internal BCM fault may cause the BCM to transmit information that another module considers implausible. In that situation, U0422 can be a secondary code rather than the root cause.

2. Which module stored U0422? #

The module reporting U0422 matters. Record every module that stores the code before clearing anything.

If several modules report invalid BCM data, the diagnosis may be different from a situation where only one receiving module rejects the information.

3. Battery voltage, BCM power and grounds #

Low or unstable system voltage can contribute to multiple electronic and communication faults.

Check battery condition, charging-system operation and the BCM power and ground circuits according to the manufacturer’s specifications, particularly when several U-codes appeared at the same time or after a weak battery, jump-start or battery replacement.

4. Connectors and wiring #

Inspect relevant BCM, gateway and network connectors for:

• corrosion;
• water intrusion;
• loose or damaged terminals;
• wiring damage;
• poor grounds;
• damage following collision or previous electrical work.

5. Module configuration and software #

Configuration or software mismatches can also produce invalid-data faults, especially after module replacement, programming, battery-related events or other electronic repairs.

Check vehicle-specific service information and applicable technical service bulletins before replacing a module.

6. CAN or vehicle-network faults #

If the complete scan reveals multiple network DTCs, communication-bus diagnosis may be required.

Network topology, expected resistance and voltage values vary by vehicle. Use the manufacturer’s wiring diagram and diagnostic procedure rather than assuming that every vehicle uses the same test values.

Step-by-step U0422 diagnosis #

Step 1 — Scan every control module #

Use a diagnostic tool capable of accessing more than the engine ECU. A basic generic OBD-II reader may not provide access to the BCM or other body and chassis modules.

Record all current, pending, history and communication-related codes before clearing them.

Step 2 — Identify which module stored U0422 #

This is one of the most important pieces of information. U0422 describes data received by another module, so knowing which module rejected the BCM information can narrow the diagnosis considerably.

Step 3 — Diagnose more specific DTCs first #

If the BCM or another module contains a more specific power, ground, sensor, switch, configuration or internal-fault code, investigate that code before treating U0422 as the primary failure.

Step 4 — Check battery condition and electrical supply #

Investigate low-voltage or charging-system problems when several modules show communication faults or when the issue began after battery trouble.

Step 5 — Inspect BCM-related connectors and wiring #

Look for moisture, corrosion, poor terminal tension, damaged wiring and previous repairs.

Step 6 — Review BCM live data #

Where the diagnostic tool and manufacturer information allow it, compare relevant BCM data with the actual vehicle condition.

An implausible switch, sensor or status value can be more useful than the generic U0422 description itself.

Step 7 — Consider recent programming or module replacement #

If the fault appeared after electronic repairs, coding, programming or module replacement, verify that the correct software and vehicle configuration are installed.

Step 8 — Check OEM service information #

Search by exact make, model, model year, module storing U0422 and any failure-type suffix attached to the code.

Step 9 — Replace a module only after testing #

A BCM or another receiving module can fail, but module replacement should normally come after the relevant power, ground, wiring, network, configuration and vehicle-specific tests.

Documented OEM examples #

General Motors bulletin 16-NA-407 #

General Motors documented U0422 on certain vehicles where temporary signal availability during vehicle startup could cause the code to be stored.

In that specific bulletin, GM advised that the U0422 stored by the affected control modules required no service unless the code was current/active or accompanied by specified BCM faults.

This is a useful example of why U0422 should not automatically trigger BCM replacement.

View GM bulletin 16-NA-407

Volkswagen diagnostic example #

Volkswagen diagnostic documentation has also shown U0422 being triggered by a specific invalid data value rather than by complete BCM failure. In one documented application, the monitor involved an ambient-temperature initialization value.

This illustrates why the exact manufacturer diagnostic strategy matters when interpreting an invalid-data code.

View the Volkswagen technical reference

Possible repairs for U0422 #

The correct repair depends entirely on the fault found during diagnosis. Possible repairs can include:

• repairing damaged wiring or connectors;
• correcting BCM power or ground problems;
• repairing an input or sensor fault responsible for implausible BCM data;
• correcting a vehicle-network fault;
• restoring the correct module configuration;
• performing an OEM-approved software update;
• replacing and programming a module when testing confirms that it is defective.

Do not replace the BCM solely because U0422 is present.

Can you drive with U0422? #

It depends on the symptoms and the systems affected.

A vehicle with only a stored history code and no malfunction may behave normally. However, if U0422 is associated with failed lighting, wipers, security functions, starting problems or another safety-related warning, the underlying problem should be diagnosed before normal use continues.

Always base the decision on the actual vehicle symptoms and other DTCs rather than on U0422 alone.

Can you simply clear U0422? #

The code can be cleared with a compatible diagnostic tool, but clearing the memory does not repair an active fault.

For an intermittent or history code, recording the complete scan and freeze-frame or environmental information before clearing can be valuable. After repairs, clear the code and verify whether it returns.

Does U0422 mean the Body Control Module needs replacement? #

No.

U0422 states that BCM-related information was considered invalid by another module. It does not identify the failed component by itself.

The root cause may be an input to the BCM, electrical supply, wiring, configuration, software, the vehicle network, the receiving module or, in some cases, the BCM itself.

Related codes #

U0140 — Lost Communication With Body Control Module

Unlike U0422, this code indicates that expected communication with the Body Control Module has been lost.

U0400 — Invalid Data Received

A broader invalid-data network code.

U0415 — Invalid Data Received From ABS Control Module

Invalid data received from the Anti-Lock Brake System control module.

For more communication-related faults, browse all Network Communication Codes.

Frequently asked questions #

Is U0422 a CAN bus code? #

It belongs to the network-communication family of DTCs. The exact network architecture and diagnostic strategy depend on the vehicle.

Can a weak battery cause U0422? #

Low or unstable voltage can contribute to electronic and network faults, particularly when several U-codes appear together. It should be checked when the scan results and vehicle history point in that direction, but it is not the only possible cause of U0422.

What should I diagnose first? #

Start with a complete module scan. Identify exactly which module stored U0422 and investigate any more specific BCM or network codes before replacing parts.

Can a basic OBD-II scanner diagnose U0422? #

Not always. Many basic readers access only generic powertrain information. Proper U0422 diagnosis may require a full-system diagnostic tool capable of communicating with the BCM and the module that stored the code.

Is U0422 the same as U0140? #

No. U0422 concerns invalid BCM data, while U0140 indicates lost communication with the BCM.