[SOLVED] Fix U186A Code: Engine Control Module Communication Lost With Brake Module

The automobile fault code U186A indicates a problem with the Engine Control Module (ECM) or its related wiring harness and connectors.

The most common symptom is the illumination of the Engine Light or Service Engine Soon Warning Light. The cause of this fault code could be a faulty ECM, an open or shorted ECM harness, or a poor electrical connection in the ECM circuit. The importance of repairing this issue lies in the fact that the ECM is responsible for controlling the engine’s performance, and any malfunction could lead to poor fuel efficiency and engine performance.

The repair difficulty is moderate, and the fix involves visually inspecting the wiring harness and connectors for any damage or corrosion.

The repair time is estimated to be around 1.0 hour.

To interpret the fault code, one needs to check the “Possible Causes” listed above and visually inspect the related components.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

If you notice the Engine Light ON or Service Engine Soon Warning Light, it could be due to the u186a fault code.

Here are the symptoms to look out for:

  • The automobile fault code U186A has the following symptoms: Engine Light ON, Service Engine Soon Warning Light.

The automobile fault code u186a can be caused by a faulty ECM, open or shorted harness, or poor electrical connection.

  • The automobile fault code U186A can be caused by a faulty Engine Control Module (ECM).
  • It can also be caused by an open or shorted Engine Control Module harness.
  • Additionally, a poor electrical connection in the Engine Control Module circuit can also trigger this fault code.

Below are some possible fixes for the automobile fault code u186a, including inspecting wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code u186a, first, check the possible causes listed above.
  • Then, visually inspect the related wiring harness and connectors.
  • Look for any damaged components and check for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The automobile fault code U186A has an estimated repair time of 1.0 hour.

The cost of fixing this fault code is influenced by the repair time.

Most auto repair shops charge between $75 and $150 per hour for their services. Therefore, the fixing cost of U186A will range between $75 and $150, depending on the repair time required.

The U186A fault code is related to the communication between the Electronic Brake Control Module (EBCM) and the Engine Control Module (ECM). The EBCM and ECM exchange operating information and commands through the Controller Area Network (CAN) serial data circuits.

If the EBCM loses power or malfunctions during the current ignition cycle, a Loss of Communication Diagnostic Trouble Code (DTC) will be set by other modules that depend on information from the EBCM.

What are the possible causes of the u186a automobile fault code?

If you see the engine light on or the service engine soon warning light, it could be due to the u186a fault code. This code is often caused by a faulty Engine Control Module (ECM), an open or shorted ECM harness, or a poor electrical connection in the ECM circuit. To fix this issue, you should visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector pins.

How can I visually inspect the related wiring harness and connectors to fix the u186a fault code?

If you’re experiencing the u186a fault code, start by checking the engine light or service engine soon warning light. The cause could be a faulty Engine Control Module (ECM), an open or shorted ECM harness, or a poor electrical connection in the ECM circuit. To fix the issue, visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins. This will help you identify the problem and take the necessary steps to resolve it.

What are the signs of damaged components that I should look for when fixing the u186a fault code?

If you’re dealing with the u186a fault code, you may notice that the engine light is on or the service engine soon warning light is illuminated. This could be caused by a faulty Engine Control Module (ECM), an open or shorted ECM harness, or a poor electrical connection in the ECM circuit. To fix the issue, start by visually inspecting the wiring harness and connectors, checking for any damaged components or broken, bent, pushed out, or corroded connector pins.

u186a error fault code explained

If your engine light is on, it could be due to a faulty Engine Control Module (ECM), an open or shorted ECM harness, or poor electrical connection. Check the wiring harness and connectors for damage, broken or corroded pins.

Inspect the components and follow the possible causes listed above.

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