U0419

What it means

The Brake System Control Module is present on the data bus but the values it reports are implausible — out of range, frozen, or failing the checksum or rolling-count check. The receiving modules reject the data. The redundant brake controller's data is rejected and the brake assists are limited. Causes include a faulty sensor feeding the module, internal computation errors, a software or calibration mismatch after a repair, or bus interference corrupting the frames.

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Wheel-speed sensor data implausible

  high

  One of the most commonly reported causes for this code — check this first.

• ABS internal computation fault

  medium

  A plausible cause — test and verify before replacing parts.

• Gateway module routing CAN messages incorrectly

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full U0419 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?