AutoCodes – Buick – U240E Buick

U240E Buick 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 Buick 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 460

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

What does this mean?

What are the Possible Causes of the DTC U240E Buick?

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 Buick?

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 Buick 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 Buick 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 Buick Code

1. What does the OBDII code U240E mean on a Buick?

The code U240E indicates a communication issue between the Transmission Range Selector Control Module and the Powertrain Control Module (PCM) via the CAN bus network.

2. What are common symptoms of the U240E code on a Buick?

Symptoms may include the transmission not shifting properly, illuminated check engine light, erratic gear selection, or the vehicle entering limp mode.

3. What causes the U240E code to appear on a Buick?

Possible causes include a faulty Transmission Range Selector Control Module, damaged wiring or connectors in the CAN bus network, a malfunctioning PCM, or software issues.

4. Can driving with the U240E code damage my Buick?

Yes, continuing to drive with this code can cause further transmission issues or safety concerns due to improper gear selection or reduced vehicle performance.

5. How can I diagnose the U240E code on my Buick?

Start by inspecting CAN bus wiring and connectors for damage, check fuse integrity, and use an advanced scan tool to monitor communication between the transmission module and the PCM.

6. How do I fix the U240E code on a Buick?

Repairs may involve replacing damaged wiring, repairing or replacing the Transmission Range Selector Control Module, updating module software, or addressing any PCM-related issues.

7. Is the U240E code specific to Buicks?

No, the U240E code can occur on other vehicles that use similar CAN bus communication systems, but the exact symptoms and repairs may vary.

8. What tools are needed to troubleshoot the U240E code?

Youâ€™ll need a professional OBDII scan tool capable of reading CAN bus data, a multimeter for testing circuits, and access to the vehicleâ€™s wiring diagram.

9. Can a low battery cause the U240E code?

Yes, a weak or failing battery can disrupt communication on the CAN bus, potentially triggering the U240E code.

10. Do I need to reprogram the Transmission Range Selector Control Module to fix the U240E code?

In some cases, reprogramming or updating the moduleâ€™s software may be necessary, but this depends on the root cause of the issue. Consult a professional technician for guidance.