AutoCodes – GMC – U240D GMC

U240D GMC Code - Transmission Range Selector Control Module Powertrain Expansion 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: U240D GMC indicates Transmission Range Selector Control Module Powertrain Expansion 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 822

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 U240D 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 U240D GMC - Transmission Range Selector Control Module Powertrain Expansion CAN Bus Off - AutoCodes.com — U240D GMC Code - Transmission Range Selector Control Module Powertrain Expansion CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U240D 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 U240D 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 U240D 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.

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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 U240D GMC Code

1. What are common symptoms of OBDII code U240D GMC?

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

2. What can cause the U240D GMC code to appear?

- The code may be triggered by a malfunction in the Transmission Range Selector Control Module or a disruption in the Powertrain Expansion CAN Bus communication.

3. How serious is the U240D GMC code?

- This code can lead to significant transmission problems if not addressed promptly. It is recommended to address the issue as soon as possible.

4. How can I diagnose the U240D GMC code?

- Diagnosis typically involves using an OBDII scanner to read the code and then conducting a thorough inspection of the transmission range selector control module and associated wiring.

5. Can I still drive my vehicle with the U240D GMC code?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the transmission.

6. What are some repair tips for fixing the U240D GMC code?

- Repair may involve checking and repairing any damaged wiring, replacing the transmission range selector control module, or reprogramming the module as needed.

7. How much does it cost to fix the U240D GMC code?

- The cost of repairs can vary depending on the underlying issue causing the code. It is advisable to consult a professional mechanic for an accurate estimate.

8. Can the U240D GMC code be cleared without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent further transmission issues.

9. How long does it take to repair the U240D GMC code?

- The repair time can vary based on the specific diagnosis and parts needed. Some repairs may be completed within a few hours, while others may take longer.

10. Is the U240D GMC code a common issue in GMC vehicles?

- While not extremely common, the U240D code can occur in GMC vehicles, particularly in those with transmission range selector control module or CAN bus communication issues.