AutoCodes – Generic – U1893

U1893 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 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 581

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1893 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 - Hybrid Control Module Lost Communication With Powertrain Control Module - AutoCodes.com — U1893 Code - Hybrid Control Module Lost Communication With Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC U1893?

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?

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 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 U1893 code?

Need more information on how to fix the U1893 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1893 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1893 Buick — Hybrid Control Module Lost Communication With Powertrain Control Module
U1893 Cadillac — Hybrid Control Module Lost Communication With Powertrain Control Module
U1893 Chevrolet — Hybrid Control Module Lost Communication With Powertrain Control Module
U1893 GMC — Hybrid Control Module Lost Communication With Powertrain Control Module

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 Code

What does OBDII code U1893 mean?

OBDII code U1893 indicates that the Hybrid Control Module has lost communication with the Powertrain Control Module, which can affect hybrid vehicle performance.

What are common symptoms of U1893?

Symptoms may include warning lights on the dashboard, reduced engine power, erratic hybrid system operation, or the inability to start the vehicle.

What could cause the U1893 code to trigger?

Common causes include damaged wiring or connectors, a faulty Hybrid Control Module, a malfunctioning Powertrain Control Module, or issues with the vehicleâ€™s electrical system.

How can I diagnose the U1893 code?

To diagnose U1893, start by checking the vehicleâ€™s wiring and connectors for damage, then use a scan tool to verify the code and check for any additional codes that may provide more information.

What are some potential repair solutions for U1893?

Repairs may involve repairing or replacing damaged wiring or connectors, reprogramming or replacing the Hybrid Control Module, or addressing issues with the Powertrain Control Module.

Can I drive my vehicle with the U1893 code?

While it may be possible to drive the vehicle, it is not recommended as it can lead to further damage or safety concerns due to reduced power or hybrid system performance.

Is U1893 a serious issue?

Yes, U1893 is a serious issue as it indicates a communication failure between critical control modules, which can affect the overall performance and safety of the vehicle.

How can I prevent the U1893 code from occurring?

To prevent U1893, ensure regular maintenance of the vehicleâ€™s electrical system, avoid exposing wiring to moisture or physical damage, and check for software updates for the control modules.

Should I clear the U1893 code after repairs?

Yes, after performing repairs, it is advisable to clear the code using a scan tool and then take the vehicle for a test drive to ensure the issue is resolved.