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U1A00 Mercury Code - Private Communication Network Internal Electronic Failure

- Code Popularity: 391 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U1A00 Mercury?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Restraints Control Module (RCM)
  • Restraints Control Module harness is open or shorted
  • Restraints Control Module circuit poor electrical connection
  • Faulty Anti-Lock Brake System (ABS) Module
⚠ Does your Mercury have Safety Recalls? → Check here

How to Fix the DTC U1A00 Mercury?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

DTC U1A00:49 (Private Communication Network: Internal Electronic Failure) - this Diagnostic Trouble Code (DTC) sets in continuous memory and on-demand when there is a communication issue between the ABS module and the RCM.
DTC U1A00:87 (Private Communication Network: Missing Message) - this DTC sets in continuous memory and on-demand when expected messages such as yaw rate sensor, lateral accelerometer, and longitudinal accelerometer missing for more than 5 seconds.
DTC U1A00:88 (Private Communication Network: Bus Off) - this DTC sets in continuous memory and on-demand when the communication bus is down between the ABS module and the RCM and they are unable to communicate.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1A00 Mercury code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code U1A00 Mercury Description

The yaw rate sensor, lateral and longitudinal accelerometers are contained in the Restraints Control Module (RCM). The RCM measures vehicle yaw rate, roll rate, lateral and longitudinal acceleration and then sends the information to the Anti-Lock Brake System (ABS) Module along with a dedicated Controller Area Network (CAN). This dedicated CAN is used only for communication between the RCM and the ABS Module. The information sent to the ABS module is used to help determine if the AdvanceTrac® system needs to be activated. This Diagnostic Trouble Code (DTC) sets in continuous memory and on-demand when there is a communication issue between the ABS module and the RCM.

OBDII Code U1A00 Mercury - Private Communication Network Internal Electronic Failure - AutoCodes.com
U1A00 Mercury Code - Private Communication Network Internal Electronic Failure

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Code U1A00 Mercury comments

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