AutoCodes – GMC – U185D GMC

U185D GMC Code - Fuel Injector Control Module Lost Communication With Engine Control Module

Quick Answer

Modules connected to the Controller Area Network (CAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: U185D GMC indicates Fuel Injector Control Module Lost Communication With Engine Control Module.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 537

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 U185D GMC Description

Modules connected to the Controller Area Network (CAN) 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. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. Each message contains the identification number of the transmitter module. A module with a CAN serial data circuits malfunction or which loses power during the current ignition cycle will have a Loss of Communication Diagnostic Trouble Code (DTC) set by other modules that depend on information from that failed module. If any of the CAN circuit are shorted to battery voltage, ground, or between them no communication is possible on the CAN serial data bus, a Diagnostic Trouble Code will set.

OBDII Code U185D GMC - Fuel Injector Control Module Lost Communication With Engine Control Module - AutoCodes.com — U185D GMC Code - Fuel Injector Control Module Lost Communication With Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U185D GMC?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U185D 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 U185D 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 U185D GMC Code

1. What are the common symptoms of OBDII code U185D GMC related to Fuel Injector Control Module Lost Communication With Engine Control Module?

- Common symptoms include engine misfires, rough idling, stalling, poor fuel economy, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code U185D GMC for Fuel Injector Control Module communication loss?

- The possible causes include damaged wiring or connectors, a faulty Fuel Injector Control Module, a malfunctioning Engine Control Module, or a communication network issue.

3. How can I diagnose the OBDII code U185D GMC related to Fuel Injector Control Module communication loss?

- Diagnosis typically involves checking the wiring and connectors for damage, testing the Fuel Injector Control Module and Engine Control Module, and using a diagnostic scanner to identify communication errors.

4. Can a DIY enthusiast repair OBDII code U185D GMC for Fuel Injector Control Module communication loss?

- DIY repairs may be possible if the issue is with wiring or connectors, but complex repairs involving module replacements or network diagnosis may require professional help.

5. Is it safe to continue driving with OBDII code U185D GMC triggered by Fuel Injector Control Module communication loss?

- It is not recommended to drive with this code active, as it can lead to poor engine performance and potential further damage if left unresolved.

6. How much does it typically cost to repair OBDII code U185D GMC due to Fuel Injector Control Module communication loss?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventive maintenance tips to avoid encountering OBDII code U185D GMC related to Fuel Injector Control Module communication issues?

- Regularly checking and maintaining the vehicle's electrical system, including wiring and connectors, can help prevent communication problems between modules.

8. Can a low battery voltage cause OBDII code U185D GMC to appear for Fuel Injector Control Module communication loss?

- Yes, low battery voltage can disrupt communication between modules and trigger this code, so ensuring the battery is in good condition is important.

9. How long does it usually take to repair OBDII code U185D GMC associated with Fuel Injector Control Module communication loss?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a full day in most cases.

10. Is it necessary to clear the OBDII code U185D GMC after repairing the Fuel Injector Control Module communication issue?

- Yes, it is important to clear the code after resolving the problem to reset the vehicle's system and ensure that the issue has been successfully addressed.