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AutoCodes - Generic - U0020

U0020 Code - Low Speed CAN Bus

- Code Popularity: 20,642 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC U0020?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • If other codes are present, diagnose other codes first
  • Faulty Control Module
  • Control Module harness is open or shorted
  • Control Module circuit poor electrical connection
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How to Fix the DTC U0020?

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 U0020 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 U0020 Description

Devices connected to the General Motors Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages need to be exchanged on the serial data circuits. The messages are also supervised, and some periodic messages are used by the receiver device as an availability indication of the transmitter device. The Diagnostic Trouble Code (DTC) will be set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U0020 - Low Speed CAN Bus - AutoCodes.com
U0020 Code - Low Speed CAN Bus

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Code U0020 comments

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