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AutoCodes - Generic - U1011

U1011 Code - CAN Communication Bus - Signal Malfunction

- Code Popularity: 18,857 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U1011?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Controller Area Network (CAN) communication harness is open or shorted
  • Faulty Engine Control Module (ECM)
  • Poor harness ground connection.
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How to Fix the DTC U1011?

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.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1011 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 U1011 Description

The Controller Area Network (CAN) is a serial communication line for real-time applications. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads the required data only.
The Diagnostic Trouble Code (DTC) sets when detecting errors during the initial diagnosis of CAN controller of the Engine Control Module (ECM).

OBDII Code U1011 - CAN Communication Bus - Signal Malfunction - AutoCodes.com
U1011 Code - CAN Communication Bus - Signal Malfunction

Need More Information on the Code?

Need more information on how to fix the U1011 code? Get Access to Factory Service Manuals

Information for Specific Makes

  • U1011 Ford Invalid Internal Control Module Monitoring Data Received From ECM/PCM
  • U1011 Lincoln Invalid Internal Control Module Monitoring Data Received From ECM/PCM
  • U1011 Mercury Invalid Internal Control Module Monitoring Data Received From ECM/PCM
  • U1011 Nissan CAN Communication Bus - Signal Malfunction

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Code U1011 comments

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