Engine-Codes - Generic - U240A

U240A - Transmission Range Control Module Chassis Expansion CAN Bus Off

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

U240A Possible Causes

  • Faulty Transmission Range Control Module
  • Transmission Range Control Module harness is open or shorted
  • Transmission Range Control Module circuit poor electrical connection

How is the U240A 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 U240A code

Labor: 1.0

The cost to diagnose the U240A 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)

U240A Meaning

The chassis high-speed General Motors Local Area Network (GMLAN)serial data circuits are serial data buses used to communicate information between the devices. The chassis high speed GMLAN serial data circuits also connect directly to the X84 Data Link Connector (DLC) for programming purposes. If this serial data system is inoperative, the devices will still communicate with the scan tool due to other serial data systems but not with each other. The device setting the Diagnostic Trouble Code (DTC) has attempted to establish communications on the chassis high-speed GMLAN serial data circuits more than 3 times.

More Information

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Information for specific makes

  • U240A BUICK Transmission Range Control Module Chassis Expansion CAN Bus Off
  • U240A CADILLAC Transmission Range Control Module Chassis Expansion CAN Bus Off
  • U240A CHEVROLET Transmission Range Control Module Chassis Expansion CAN Bus Off
  • U240A GMC Transmission Range Control Module Chassis Expansion CAN Bus Off

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