AutoCodes – GMC – U0252 GMC

U0252 GMC Code - Lost Communication With Trailer Interface Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Trailer Interface Control Module, Trailer Interface Control Module harness is open or shorted, Trailer Interface 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: U0252 GMC indicates Lost Communication With Trailer Interface Control Module.
Common causes: Common causes include Faulty Trailer Interface Control Module, Trailer Interface Control Module harness is open or shorted, Trailer Interface 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 965

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 Apr 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0252 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Trailer Interface Control Module has not been received.

OBDII Code U0252 GMC - Lost Communication With Trailer Interface Control Module - AutoCodes.com — U0252 GMC Code - Lost Communication With Trailer Interface Control Module

What does this mean?

What are the Possible Causes of the DTC U0252 GMC?

Faulty Trailer Interface Control Module
Trailer Interface Control Module harness is open or shorted
Trailer Interface Control Module circuit poor electrical connection

How to Fix the DTC U0252 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 U0252 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 U0252 GMC Code

1. What are the common symptoms of OBDII code U0252 in a GMC vehicle?

- Common symptoms include loss of communication with the trailer interface control module, malfunction indicator light (MIL) illumination, and possible trailer-related issues.

2. What are the possible causes of the U0252 code in a GMC vehicle?

- The U0252 code can be caused by a faulty trailer interface control module, damaged wiring or connectors, electrical interference, or software issues.

3. How can I diagnose the U0252 code in my GMC vehicle?

- Diagnosis typically involves inspecting the trailer interface control module, checking the wiring and connectors for damage, testing the communication lines, and using a scan tool to retrieve trouble codes and data.

4. Is it safe to drive with the U0252 code present in a GMC vehicle?

- It is not recommended to drive with the U0252 code, as it can affect the operation of the trailer interface control module and potentially compromise safety when towing a trailer.

5. How can the U0252 code in a GMC vehicle be repaired?

- Repairs may involve repairing or replacing damaged wiring or connectors, replacing the trailer interface control module, addressing any electrical interference issues, and clearing the trouble codes.

6. Can the U0252 code be triggered by a trailer-related problem?

- Yes, the U0252 code indicates a lost communication with the trailer interface control module, so issues with the trailer or its wiring can potentially trigger this code.

7. Are there any common issues that may lead to the U0252 code in a GMC vehicle?

- Common issues include water damage to the trailer interface control module, corrosion in connectors, poor quality trailer wiring, or a malfunctioning trailer brake controller.

8. Will resetting the U0252 code make it go away permanently?

- Simply resetting the code may temporarily clear the MIL, but if the underlying issue causing the U0252 code is not addressed, the code is likely to return.

9. Can a DIY enthusiast repair the U0252 code in a GMC vehicle?

- Depending on the root cause of the code, some DIY enthusiasts with experience in automotive electrical systems may be able to diagnose and repair the U0252 code themselves.

10. Is the U0252 code specific to GMC vehicles?

- The U0252 code is a standardized OBDII code that can appear in various make and models, but in this case, it is specific to GMC vehicles indicating a lost communication with the trailer interface control module.