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U1A00 MERCURY Code - Private Communication Network Internal Electronic Failure

Updated Jun 10, 2020
- Code Popularity: 253 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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|U1A00 MERCURY code possible 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

|How do I fix code U1A00 MERCURY code?

Check 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.

|U1A00 MERCURY 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.

|Cost of diagnosing U1A00 MERCURY code

Labor: 1.0

The cost of diagnosing the U1A00 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|What are U1A00 MERCURY code possible symptoms?

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

|U1A00 MERCURY code 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
Private Communication Network Internal Electronic Failure

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|U1A00 MERCURY code comments

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