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U1186 Dodge Code - Lost Communication With Adaptive Cruise Control Module

Quick Answer

The U1186 diagnostic trouble code (DTC) for Dodge vehicles indicates that there is a communication issue with the Adaptive Cruise Control (ACC) module. Common causes include Faulty wiring or connectors related to the ACC module, Malfunctioning ACC module, Issues with the control module communicating with the ACC module. 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 Dodge indicates Lost Communication With Adaptive Cruise Control Module.
Common causes
Common causes include Faulty wiring or connectors related to the ACC module, Malfunctioning ACC module, Issues with the control module communicating with the ACC module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 19, 2024
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Code U1186 Dodge Description

The U1186 diagnostic trouble code (DTC) for Dodge vehicles indicates that there is a communication issue with the Adaptive Cruise Control (ACC) module. This means that the onboard computer system is unable to establish a connection with the ACC module, which is responsible for controlling the vehicle's adaptive cruise control system. The ACC system uses sensors to monitor the distance between your vehicle and the one in front of you, adjusting your speed accordingly to maintain a safe following distance.

OBDII Code U1186 Dodge - Lost Communication With Adaptive Cruise Control Module
U1186 Dodge Code - Lost Communication With Adaptive Cruise Control Module

Common Causes of U1186 Dodge

  1. Faulty wiring or connectors related to the ACC module
  2. Malfunctioning ACC module
  3. Issues with the control module communicating with the ACC module
  4. Network communication problems within the vehicle's system

Symptoms of U1186 Dodge

  1. Adaptive cruise control system not working
  2. Loss of collision warning and automatic braking features
  3. Dashboard warning light related to ACC system
  4. Inconsistent speed control while using cruise control

How to Fix U1186 Dodge

  1. Begin by conducting a thorough inspection of the wiring and connectors related to the ACC module to check for any damage or loose connections.
  2. Test the ACC module to determine if it is functioning correctly or needs to be replaced.
  3. Check the control module for any faults or errors that may be preventing communication with the ACC module.
  4. Diagnose and repair any network communication issues within the vehicle's system that may be affecting the ACC module.
  5. Clear the DTC from the vehicle's computer system and test the ACC system to ensure proper functionality.

Cost to Fix U1186 Dodge

The cost of repairing a lost communication issue with the Adaptive Cruise Control module can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a few quotes from different shops to find the best price. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 U1186 Dodge Code

1. What are the common symptoms of OBDII code U1186 in a Dodge vehicle related to the Adaptive Cruise Control Module?

- Common symptoms include the cruise control system not working, the adaptive cruise control not functioning properly, and the illumination of the check engine light.

2. What are some possible causes of the U1186 code indicating a lost communication with the Adaptive Cruise Control Module in a Dodge?

- Possible causes include a faulty cruise control module, damaged wiring or connectors, a blown fuse, software issues, or a malfunctioning powertrain control module.

3. How can I diagnose the U1186 code in my Dodge to pinpoint the issue with the Adaptive Cruise Control Module?

- Diagnosing the U1186 code typically involves using an OBDII scanner to retrieve the specific fault codes, checking the wiring and connectors for any damage, and performing a thorough inspection of the cruise control system components.

4. Is it safe to continue driving my Dodge with the U1186 code related to the Adaptive Cruise Control Module issue?

- While the vehicle should still be safe to drive, it is recommended to address the issue promptly to ensure the proper functioning of the cruise control system and avoid any potential safety hazards.

5. Can I repair the U1186 code related to the Adaptive Cruise Control Module in my Dodge on my own?

- Depending on your level of automotive expertise, you may be able to address the issue yourself by checking and repairing any damaged wiring or connectors, or by replacing the cruise control module if necessary.

6. How much does it typically cost to repair the U1186 code indicating a lost communication with the Adaptive Cruise Control Module in a Dodge?

- Repair costs can vary depending on the specific cause of the issue, but they may range from a few hundred dollars for simple fixes like replacing a fuse or connector, to over a thousand dollars for more complex repairs involving module replacement.

7. Are there any preventive maintenance tips to avoid encountering the U1186 code related to the Adaptive Cruise Control Module in my Dodge?

- To prevent issues with the Adaptive Cruise Control Module, it is recommended to regularly inspect and maintain the cruise control system components, check for any signs of wear or damage, and address any warning lights or unusual behavior promptly.

8. Will resetting the OBDII code U1186 related to the Adaptive Cruise Control Module in my Dodge make the issue go away permanently?

- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying problem causing the lost communication with the Adaptive Cruise Control Module. It is crucial to diagnose and repair the issue to prevent it from recurring.

9. Can extreme weather conditions or environmental factors contribute to triggering the U1186 code in a Dodge vehicle with Adaptive Cruise Control?

- While rare, extreme weather conditions or environmental factors such as water ingress, corrosion, or extreme temperatures can potentially lead to communication issues with the Adaptive Cruise Control Module, triggering the U1186 code.

10. How long does it typically take to repair the U1186 code indicating a lost communication with the Adaptive Cruise Control Module in a Dodge?

- The repair time can vary depending on the specific cause of the issue and the complexity of the repair. Simple fixes like replacing a fuse or connector may take less than an hour, while more involved repairs could take several hours or even a day.

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