U0418Network Communication

Invalid Data Received From Brake System Control Module

U0418 means a module received invalid or implausible data from the brake system control module over the CAN bus. It can stem from a sensor fault, a software issue, or a wiring problem.

🚗 Not recommended. Invalid data from the brake control module can disable braking assist features.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Underlying brake sensor fault$100-$500

40%

A brake system sensor or input fault produces invalid data.

#2Wiring or connector fault$50-$500

30%

Bus wiring problems corrupt the data being sent.

#3Software or module fault$100-$1200

20%

Outdated software or a failing brake module sends bad data.

🩺 Common Symptoms

Brake warning light
ABS or stability control disabled
Warning lights
Other U-codes and C-codes stored
Reduced brake assist

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$150-$1000

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose U0418

1Scan for stored brake system codes first and address them

2Inspect CAN wiring and connectors for faults

3Check brake system sensor signals

4Verify the module software is current

❓ Frequently Asked Questions

Can I drive with U0418?

Not safely. Braking assist features may be disabled. Diagnose it first.

What causes U0418?

Often a brake system sensor fault producing bad data, or wiring issues on the bus.

Do my brakes still work with U0418?

Base braking usually still works, but assist features like ABS may be off. Drive carefully and repair soon.

🔗 Related Codes

U0121U0415U0122U0100