AutoCodes – Generic – U185D

U185D 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 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 1,296

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

What does this mean?

What are the Possible Causes of the DTC U185D?

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?

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 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 U185D code?

Need more information on how to fix the U185D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U185D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U185D Buick — Fuel Injector Control Module Lost Communication With Engine Control Module
U185D Cadillac — Fuel Injector Control Module Lost Communication With Engine Control Module
U185D Chevrolet — Fuel Injector Control Module Lost Communication With Engine Control Module
U185D GMC — Fuel Injector Control Module Lost Communication With Engine 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 U185D Code

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

- Common symptoms include engine misfires, rough idling, poor acceleration, and potentially stalling while driving.

2. What are the possible causes of OBDII code U185D?

- The code U185D can be triggered by issues such as a faulty fuel injector control module, a damaged wiring harness, a loose connection, or a malfunctioning engine control module.

3. How can I diagnose the cause of OBDII code U185D?

- To diagnose the issue, you can use a diagnostic scanner to retrieve the trouble codes, inspect the wiring connections, test the fuel injector control module, and check for any underlying electrical problems.

4. Can a bad fuel injector cause code U185D to appear?

- Yes, a malfunctioning fuel injector can potentially trigger code U185D if it causes a loss of communication between the fuel injector control module and the engine control module.

5. What are some repair tips for resolving OBDII code U185D?

- Repair tips include checking and repairing any damaged wiring, ensuring all connections are secure, replacing a faulty fuel injector control module if necessary, and addressing any underlying issues with the engine control module.

6. Is it safe to continue driving with OBDII code U185D present?

- It is not recommended to continue driving with code U185D, as it can lead to further engine problems and potentially unsafe driving conditions. It is best to address the issue promptly.

7. Can a DIY enthusiast fix OBDII code U185D at home?

- Depending on the underlying cause, some DIY enthusiasts may be able to address code U185D at home by following repair guides, but complex electrical issues may require professional assistance.

8. How much does it typically cost to repair OBDII code U185D?

- The cost of repairing code U185D can vary depending on the cause of the issue, the extent of the repairs needed, and whether you choose to DIY or seek professional help. Costs can range from a few hundred to over a thousand dollars.

9. Will resetting the trouble codes make OBDII code U185D disappear permanently?

- Resetting the trouble codes may temporarily clear code U185D, but if the underlying issue is not fixed, the code is likely to reappear once the problem is detected again by the vehicle's system.

10. How urgent is it to address OBDII code U185D?

- It is advisable to address code U185D promptly to prevent further engine complications, ensure optimal performance, and maintain the safety and efficiency of your vehicle.