AutoCodes – GMC – U240E GMC

U240E GMC Code - Transmission Range Selector Control Module Powertrain Sensor CAN Bus Off

Quick Answer

The powertrain high-speed General Motors Local Area Network (GMLAN)serial data circuits are serial data buses used to communicate information between the devices. Common causes include Faulty Transmission Range Selector Control Module, Transmission Range Selector Control Module harness is open or shorted, Transmission Range Selector Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U240E GMC indicates Transmission Range Selector Control Module Powertrain Sensor CAN Bus Off.
Common causes: Common causes include Faulty Transmission Range Selector Control Module, Transmission Range Selector Control Module harness is open or shorted, Transmission Range Selector Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 518

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U240E GMC Description

The powertrain high-speed General Motors Local Area Network (GMLAN)serial data circuits are serial data buses used to communicate information between the devices. The powertrain 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 powertrain high-speed GMLAN serial data circuits more than 3 times.

OBDII Code U240E GMC - Transmission Range Selector Control Module Powertrain Sensor CAN Bus Off - AutoCodes.com — U240E GMC Code - Transmission Range Selector Control Module Powertrain Sensor CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U240E GMC?

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

How to Fix the DTC U240E GMC?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U240E GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U240E GMC code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U240E GMC Code

1. What are common symptoms of the U240E GMC OBDII code?

- Common symptoms include issues with shifting gears, transmission slipping, poor fuel efficiency, and the vehicle going into limp mode.

2. What can cause the U240E GMC OBDII code to trigger?

- The code can be triggered by a malfunction in the Transmission Range Selector Control Module Powertrain Sensor CAN bus communication, which may be caused by wiring issues, a faulty module, or a software glitch.

3. How can I diagnose the U240E GMC OBDII code?

- Diagnosis typically involves using a professional OBDII scanner to read and interpret the code, as well as conducting a thorough inspection of the transmission range selector control module and related wiring.

4. Can I continue driving with the U240E GMC code present?

- It is not recommended to continue driving with the code present, as it can lead to further damage to the transmission and other components. Seek professional assistance to address the issue promptly.

5. How is the U240E GMC OBDII code typically repaired?

- Repairing the U240E code often involves addressing the underlying cause, which may include repairing or replacing damaged wiring, replacing the transmission range selector control module, or updating software.

6. Are there any DIY tips for fixing the U240E GMC OBDII code?

- While some basic troubleshooting like checking for loose connections or damaged wires can be done by DIY enthusiasts, it is generally recommended to seek professional help for accurate diagnosis and repair.

7. Can a low battery voltage trigger the U240E GMC OBDII code?

- Yes, a low battery voltage can sometimes lead to electrical communication issues that trigger the U240E code. Ensure the battery is in good condition and properly charged.

8. How much does it typically cost to repair the U240E GMC OBDII code?

- The cost of repairing the U240E code can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Is the U240E GMC OBDII code specific to certain GMC vehicle models?

- The U240E code is specific to GMC vehicles equipped with OBDII systems, particularly those with transmission range selector control module powertrain sensor CAN bus communication systems.

10. Can regularly servicing the transmission prevent the U240E GMC OBDII code from appearing?

- While regular transmission maintenance can help prevent some issues, the U240E code is typically related to specific electrical communication problems and may not be prevented solely by routine servicing.