Error code

OBD2 U0418

OBD2U0418
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Invalid Data Received From Brake System Control Module.

Severity

moderateCan drive, but monitor symptoms and address issues promptly.

Summary

U0418 indicates invalid data received from the brake system control module, which is typically located in the engine bay near the ABS pump assembly.

Symptoms

  • Brake warning light on
  • Speedometer malfunction

Common Causes

  • Defective brake control module
  • Poor connection or damaged wiring between modules
  • Loose CAN-Bus connector under the dash (Jeep-specific)
  • Mechanically damaged wiring from wheel speed sensor (Ford Ranger-specific)

Diagnosis

  1. Check for loose or damaged wiring connections
  2. Inspect brake control module for signs of failure
  3. Consider reprogramming the Powertrain Control Module (PCM) if applicable

Fixes

  • Replace defective brake control module
  • Repair or replace damaged wiring and connectors

FAQ

Is U0418 a serious issue?

It is moderate in severity. While it can cause warning lights to come on, the vehicle may still be drivable.

How do I know if my brake control module needs replacement?

If other diagnostic codes accompany U0418 and symptoms persist after checking wiring connections, a faulty brake control module is likely.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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