Engine-Codes - Fiat - U11D2 FIAT

U11D2 FIAT - Lost Brake Signal

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

U11D2 FIAT Possible Causes

  • Faulty Powertrain Control Module (PCM)
  • Faulty Anti-lock Braking System (ABS) Module
  • Faulty Transmission Control Module (TCM)

How is the U11D2 FIAT code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the U11D2 FIAT code

Labor: 1.0

The cost to diagnose the U11D2 FIAT code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U11D2 FIAT Meaning

This diagnostic checks the validity of the brake switch message which is sent by the Anti-lock Braking System (ABS) Module via Controller Area Network (CAN) network. The diagnostic checks the validity by performing a CRC and message counter check to verify the brake switch message is continuously updated by the ABS module and it has a valid value. A signal toggle bit and a signal parity bit are sent by the ABS module within the CAN message. In order to be sure the message content is continuously updated, the value of the toggle bit changes from 0 to 1 and vice versa every two messages. In order to be sure the message content is valid, the parity bit value is set so that the sum of specific signal bits (PcmBrkSw) of the message content plus the toggle bit plus the parity bit is an even number. If the toggle bit value does not change or the signal parity is not verified for a calibrated amount of time then the Diagnostic Trouble Code (DTC) U11D2 is set.

More Information

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