U0418

Invalid Data Received From Brake System Control Module A

Communication network (brakes) Generic OBD-II Medium

What it means

U0418 sets when a control module reads data from the brake system control module that is missing, out of range, or implausible. Base braking usually remains, but ABS, stability control, and brake-assist features can shut off — and because some vehicles route braking assist through this module, it's worth checking promptly.

Medium

Can I keep driving? Base braking generally still works, but ABS, stability, and brake-assist features may be disabled — brake carefully and get it checked promptly.

Real-world scan data

Seen in

334

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of U0418 scans

U3003in 15.0% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Brake, ABS, and stability warning lights on, usually with the check-engine light
ABS and stability control disabled
Reduced or changed brake-assist feel on some vehicles
Normal (base) braking still available
Related communication codes stored in other modules

Common causes

Most likely first

Faulty brake system control module or its power/ground supplyLikely
Corroded, loose, or damaged connectors and data-bus (CAN) wiringCommon
Low or unstable battery and charging-system voltageCommon
Software incompatibility after a module was replaced or updatedLess often
An underlying brake-system sensor or actuator fault reported by the moduleLess often

How to diagnose & fix

Work through it in order

Scan all modules and record stored codes and freeze-frame data before clearing.
Check battery and charging voltage — low or noisy voltage is a common cause of bus faults.
Inspect connectors and wiring to the brake system control module and along the data bus.
If a module was recently replaced or flashed, confirm the software is compatible.
Run the manufacturer's pinpoint tests on the brake system module and its inputs; replace only if confirmed.

FAQ

Quick answers

Is it safe to drive with U0418?+

Base brakes usually still work, so you can drive carefully, but ABS, stability, and any brake-assist features may be off — allow extra stopping distance and get it checked promptly, as some vehicles use this module for braking assist.

Can I just clear U0418?+

You can, but if the brake system module or its data link is still faulty the code returns and the brake/ABS warning lights come back on.

Read & clear U0418 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX