AutoCodes – GMC – U1893 GMC

U1893 GMC Code - Hybrid Control Module Lost Communication With Powertrain Control Module

Quick Answer

Modules connected to the class 2 and high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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: U1893 GMC indicates Hybrid Control Module Lost Communication With Powertrain Control Module.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain 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 820

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1893 GMC Description

Modules connected to the class 2 and 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 Diagnostic Trouble Code (DTC) is reported on a class 2 link to the scan tool by Powertrain Control Module (PCM) even if they may be set by different modules. The DTC will set when a node alive message has not been received from an identified module within the last 5 seconds after establishing class 2 serial data communication, or a supervised high-speed GMLAN message has not been received.

OBDII Code U1893 GMC - Hybrid Control Module Lost Communication With Powertrain Control Module - AutoCodes.com — U1893 GMC Code - Hybrid Control Module Lost Communication With Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC U1893 GMC?

Faulty Powertrain Control Module (PCM)
Powertrain Control Module harness is open or shorted
Powertrain Control Module circuit poor electrical connection
Faulty Hybrid Control Module (HCM)

How to Fix the DTC U1893 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 U1893 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 U1893 GMC Code

1. What are the common symptoms of OBDII code U1893 GMC?

- Common symptoms include the hybrid system not functioning properly, poor fuel efficiency, and potential issues with starting the vehicle.

2. What can cause the Hybrid Control Module to lose communication with the Powertrain Control Module?

- Possible causes include damaged wiring, loose connections, a faulty control module, or software issues within the vehicle's system.

3. How can I diagnose the U1893 code related to the communication loss between modules?

- Diagnosis typically involves using a scan tool to retrieve the specific code, checking for any related codes, and inspecting the wiring and connections between the modules.

4. Are there any quick repair tips for addressing the U1893 code in a GMC vehicle?

- Quick tips may include checking and securing all electrical connections, ensuring proper power supply to the modules, and clearing the code with a scan tool to see if it reoccurs.

5. Is it safe to continue driving my GMC with the U1893 code present?

- It is not recommended to drive the vehicle with unresolved communication issues between critical control modules, as it can lead to further damage and potentially unsafe driving conditions.

6. Can a DIY enthusiast fix the U1893 code issue, or is professional help required?

- Depending on the underlying cause, some DIY enthusiasts may be able to address the issue by checking connections and basic troubleshooting. However, complex issues may require professional assistance.

7. How much does it typically cost to repair the Hybrid Control Module communication problem in a GMC vehicle?

- The cost of repair can vary widely based on the exact cause of the issue, the need for replacement parts, and whether professional labor is required, ranging from a few hundred to over a thousand dollars.

8. Will resetting the vehicle's computer system clear the U1893 code?

- Resetting the computer system may temporarily clear the code, but if the underlying issue causing the communication loss is not addressed, the code is likely to reappear.

9. Can extreme weather conditions or environmental factors trigger the U1893 code?

- While extreme weather conditions can potentially affect the electrical connections, the U1893 code is more commonly a result of internal issues within the vehicle's control modules.

10. How long can I safely wait before addressing the U1893 code in my GMC vehicle?

- It is advisable to address the U1893 code as soon as possible to prevent further issues with the vehicle's hybrid system and potential safety risks associated with communication failures between critical modules.