OBD-II trouble code
U0418: Invalid Data Received from Brake System Control Module
A module is receiving messages from the brake system control module (ABS/ESC), but the data is implausible or out of range. The connection is alive — the content is wrong. Often a wheel-speed 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 – $1,200
- DIY difficulty
- Shop recommended
What does U0418 mean?
U0418 is different from a 'lost communication' code. Here the receiving module is still hearing from the brake system control module — the ABS / electronic stability control unit — so 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 U0418.
Because the problem is the content of the data rather than the link itself, the causes lean toward whatever makes the brake module send bad information. The brake module gathers wheel-speed signals, the steering angle, yaw and lateral acceleration, and brake-pressure data, so a failing or out-of-range sensor feeding it — most commonly a wheel-speed sensor — can cause it to broadcast an implausible value. The module's calibration or software can be at fault: outdated, corrupted, or mismatched after a module was replaced or flashed without proper programming, or a steering-angle or yaw sensor that was never relearned after service. The brake module itself can have an internal fault. There are usually accompanying chassis 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.
The symptoms depend on which data is invalid. You may see ABS, traction-control, and stability-control warning lights, those systems disabling themselves because they can't trust the data they need, and features such as adaptive cruise or hill-hold that rely on brake data dropping out. Vehicle speed shown to other systems can be affected because wheel-speed data often originates here. The car usually still drives and stops on its normal hydraulic brakes, but the anti-lock and stability functions may be offline, so U0418 should be diagnosed promptly by reading the full code set and finding what's actually producing the bad data.
Common causes
- Failing or out-of-range wheel-speed sensor feeding the brake module
- Steering-angle, yaw, or lateral-acceleration sensor not relearned after service
- Accompanying ABS/ESC fault producing the invalid value
- Outdated, corrupted, or mismatched brake module calibration/software
- Brake system control module internal fault
- Low system voltage causing implausible data
- Electrical noise, a marginal bus, or wiring corrupting messages
- Brake module replaced or flashed without proper programming
Symptoms
- ABS, traction-control, and stability-control warning lights on
- Those systems disabling themselves until the data is trusted again
- Adaptive cruise or hill-hold features dropping out
- Speed-dependent features misbehaving (wheel-speed data often originates here)
- Multiple related chassis codes stored alongside U0418
- Intermittent symptoms tied to a specific operating condition
- Normal hydraulic braking still works, but anti-lock/stability may be offline
Diagnostic steps
- 1.Read ALL stored codes first — U0418 is often secondary to an ABS/ESC code that names the bad signal.
- 2.Address any companion wheel-speed, steering-angle, or yaw sensor codes, since they frequently identify the root cause.
- 3.Check system voltage and the battery/charging system; low voltage can cause implausible data.
- 4.Verify the brake module has the correct, current calibration and that steering-angle/yaw sensors were relearned after any service.
- 5.Inspect bus wiring and connectors for damage or noise sources that could corrupt messages.
- 6.Use live data to compare wheel-speed and other questioned values against actual conditions; confirm the failing sensor or the module before replacing anything.
Repair cost
$100 – $1,200
Cost depends entirely on what's producing the bad data. A failing wheel-speed sensor is often $150-$450 including diagnosis. A steering-angle or yaw sensor relearn is typically $100-$200. Correcting low voltage or a charging fault runs $150-$600. A calibration update/reflash is typically $100-$300. Brake module (ABS/ESC) replacement and programming is the expensive case at $700-$1,200+ but should only follow thorough diagnosis. Because U0418 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.