OBD-II trouble code
U0422: Invalid Data Received from Body Control Module
A module is receiving messages from the body control module (BCM), but the data is implausible or out of range. The connection is alive — the content is wrong. Often a switch, sensor, calibration, or internal fault driving bad data, or a network issue corrupting it.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $100 – $1,000
- DIY difficulty
- Shop recommended
What does U0422 mean?
U0422 is different from a 'lost communication' code. Here the receiving module is still hearing from the body control module (BCM) — the connection is alive — but the data inside those messages is invalid: a value is out of its expected range, implausible, missing, or conflicts with what other sensors report. The messenger is talking, but what it's saying doesn't make sense, so the receiving module rejects the data and stores U0422.
Because the problem is the content of the data rather than the link itself, the causes lean toward whatever makes the BCM send bad information. The body control module manages a wide range of switches, sensors, and outputs — lighting, wipers, door and ignition status, key/security inputs, climate requests, and more — so a failing switch or sensor feeding it can cause it to broadcast an implausible value. The BCM's configuration or software can be at fault: outdated, corrupted, or mismatched after a module was replaced or programmed without the correct vehicle configuration. The BCM itself can have an internal fault. There are usually accompanying body codes that point at the specific signal that's wrong, and those should be read and addressed first. Network problems can still play a role: electrical noise, a marginal bus, wiring issues, or low system voltage can corrupt otherwise-good messages or make the module report implausible data.
The symptoms depend on which data is invalid. The BCM touches so many comfort and convenience systems that you may see misbehaving lighting, wipers, power accessories, climate, or keyless functions, warning messages in the cluster, or features that disable themselves because they can't trust the body data they need. Because the BCM also relays ignition and security status, an invalid value here can occasionally affect starting or anti-theft behavior. The car is usually still driveable, but because the underlying fault can ripple into several convenience systems, U0422 should be diagnosed by reading the full code set and finding what's actually producing the bad data.
Common causes
- Failing switch or sensor feeding the BCM (lighting, door, ignition, climate inputs)
- Accompanying body-system fault producing the invalid value
- Incorrect BCM configuration or outdated/corrupted software
- Body control module internal fault
- Low system voltage causing implausible data
- Electrical noise or a marginal bus corrupting messages
- BCM replaced or programmed without the correct vehicle configuration
- Wiring or connector issue degrading signal quality
Symptoms
- Lighting, wipers, or power accessories behaving erratically
- Climate or keyless/comfort features misbehaving
- Warning messages in the instrument cluster
- Features disabling themselves due to untrusted body data
- Occasional starting or anti-theft quirks (BCM relays ignition/security status)
- Multiple related body codes stored alongside U0422
- Car generally still driveable
Diagnostic steps
- 1.Read ALL stored codes first — U0422 is often secondary to a body code that names the bad signal.
- 2.Address any companion switch or sensor codes, since they frequently identify the root cause.
- 3.Check system voltage and the battery/charging system; low voltage can cause implausible data and BCM misbehavior.
- 4.Verify the BCM has the correct configuration and current software — especially if a module was recently replaced or programmed.
- 5.Inspect bus wiring and connectors for damage or noise sources that could corrupt messages.
- 6.Use live data to compare the questioned value against actual switch and sensor states; confirm the failing input or the BCM before replacing anything.
Repair cost
$100 – $1,000
Cost depends entirely on what's producing the bad data. A failing switch or sensor is often $100-$400 including diagnosis. Correcting low voltage or a charging fault runs $150-$600. A configuration or software update is typically $100-$300. BCM replacement and programming is the expensive case at $400-$1,000+ but should only follow thorough diagnosis. Because U0422 is frequently a secondary code, fixing the companion fault often clears it.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with module communication / can bus diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
Leave this one to a qualified shop. It typically involves emissions-critical components, refrigerant handling, or other work that requires manufacturer-grade tooling, training, or certification. DIY attempts often produce a more expensive problem than the original code.