AutoCodes – RAM – U1186 RAM

U1186 RAM Code - Lost Communication With Adaptive Cruise Control Module

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) doesn't receive a bus message from the Cruise Control Module for a specific amount of time. Common causes include Faulty Cruise Control Module, Cruise Control Module harness is open or shorted, Cruise 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: U1186 RAM indicates Lost Communication With Adaptive Cruise Control Module.
Common causes: Common causes include Faulty Cruise Control Module, Cruise Control Module harness is open or shorted, Cruise 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 524

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 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1186 RAM Description

The Diagnostic Trouble Code (DTC) sets when the Powertrain Control Module (PCM) doesn't receive a bus message from the Cruise Control Module for a specific amount of time.

OBDII Code U1186 RAM - Lost Communication With Adaptive Cruise Control Module - AutoCodes.com — U1186 RAM Code - Lost Communication With Adaptive Cruise Control Module

What does this mean?

What are the Possible Causes of the DTC U1186 RAM?

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

How to Fix the DTC U1186 RAM?

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 U1186 RAM 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 U1186 RAM code?

Need more information on how to fix the U1186 RAM code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1186 RAM code diagnosed by a professional: Find a repair shop in your area

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 U1186 RAM Code

1. What are common symptoms of OBDII code U1186 RAM "Lost Communication With Adaptive Cruise Control Module"?

The common symptoms include the adaptive cruise control system not functioning properly, warning lights illuminated on the dashboard, and potential issues with cruise control operation.

2. What are some possible causes of OBDII code U1186 RAM?

Possible causes include a malfunctioning adaptive cruise control module, damaged wiring or connectors in the communication system, software glitches, or a faulty vehicle speed sensor.

3. How can I diagnose the issue related to OBDII code U1186 RAM?

Diagnostic steps may include checking the wiring and connectors related to the adaptive cruise control module, inspecting the module for any visible damage, and using a diagnostic scanner to read and clear the code.

4. Can I still drive my vehicle with OBDII code U1186 RAM present?

It is not recommended to drive the vehicle with this code present, as it may affect the functionality of the adaptive cruise control system and potentially other vehicle systems.

5. How can I repair OBDII code U1186 RAM "Lost Communication With Adaptive Cruise Control Module"?

Repair options may involve replacing the adaptive cruise control module, repairing any damaged wiring or connectors, updating software if necessary, and clearing the code using a diagnostic scanner.

6. Will resetting the OBDII code U1186 RAM make the issue go away permanently?

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

7. Is it safe to continue using the adaptive cruise control if the OBDII code U1186 RAM is present?

It is not safe to rely on the adaptive cruise control system if the code is present, as it indicates a communication issue that may impact the proper functioning of the system.

8. How much does it typically cost to repair OBDII code U1186 RAM?

The cost of repairs can vary depending on the specific cause of the communication loss, but it may involve parts and labor expenses ranging from a few hundred to over a thousand dollars.

9. Can a DIY enthusiast fix OBDII code U1186 RAM at home?

DIY enthusiasts with advanced automotive repair knowledge and the necessary tools may be able to diagnose and repair the issue at home, but it is recommended to consult a professional mechanic for accurate diagnosis and safe repairs.

10. Are there any recalls or technical service bulletins related to OBDII code U1186 RAM?

It is advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to the specific OBDII code U1186 RAM and related issues with the adaptive cruise control module.