[SOLVED] Fix U1866 Code: Body Control Module Communication Lost With Battery

The automobile fault code U1866 indicates a problem with the Body Control Module (BCM). The most common symptom is the Engine Light ON or Service Engine Soon Warning Light. The cause of this fault code could be a faulty BCM, an open or shorted BCM harness, or a poor electrical connection in the BCM circuit.

It is important to address this issue promptly as it can affect the overall performance of the vehicle. The repair time for this fault code is estimated at 1.0, and the fix involves visually inspecting the wiring harness and connectors, checking for damaged components, and looking for broken, bent, pushed out, or corroded connector’s pins. It is crucial to check the possible causes listed above to interpret the fault code accurately.

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 u1866 fault code.

Symptoms include:

  • The automobile fault code U1866 has the following symptoms: Engine Light ON, Service Engine Soon Warning Light ON.

The automobile fault code u1866 can be caused by a faulty BCM, open or shorted BCM harness, or poor electrical connection.

  • The automobile fault code U1866 can be caused by a faulty Body Control Module (BCM).
  • It can also be caused by an open or shorted Body Control Module harness.
  • Additionally, a poor electrical connection in the Body Control Module circuit can also trigger this fault code.

To fix the automobile fault code u1866, check the possible causes and inspect the related wiring harness and connectors for any damage or corrosion.

  • To fix the automobile fault code u1866, 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 U1866 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 U1866 will depend on the hourly rate charged by the repair shop. It is important to consider the repair time and hourly rate when estimating the cost of fixing this fault code.

The U1866 code is related to the Controller Area Network (CAN) serial data circuits in a vehicle. The modules connected to the CAN circuits monitor for serial data communications during normal vehicle operation. If a module with a CAN circuit malfunction or loses power during the current ignition cycle, a Loss of Communication Diagnostic Trouble Code (DTC) will be set by other modules that depend on information from that failed module.

The U1866 code specifically indicates that the Battery Energy Control Module has lost communication with the Body Control Module.

What are the possible causes of the u1866 automobile fault code?

If you see the engine light on or the service engine soon warning light, it could be due to the u1866 automobile fault code. This code is caused by a faulty Body Control Module (BCM), an open or shorted BCM harness, or a poor electrical connection in the BCM 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’s pins.

How can one visually inspect the related wiring harness and connectors to fix the u1866 fault code?

If you’re experiencing the u1866 fault code, which is indicated by the Engine Light ON or Service Engine Soon Warning Light, there are a few things you can do to fix it. The cause of this issue could be a faulty Body Control Module (BCM), an open or shorted Body Control Module harness, or a poor electrical connection in the Body Control Module circuit. To address this problem, you should visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector’s pins.

What are the signs that the Body Control Module harness is open or shorted, causing the u1866 fault code?

If the engine light is on or the service engine soon warning light is illuminated, it could be a sign of a faulty Body Control Module (BCM) or an open or shorted BCM harness. The cause could also be a poor electrical connection in the BCM circuit. To fix this issue, it is recommended to visually inspect the related wiring harness and connectors for any damage or corrosion. Check for broken, bent, pushed out, or corroded connector pins to ensure proper electrical connection.

u1866 error fault code explained

If your engine light is on, it could be due to a faulty Body Control Module (BCM), an open or shorted BCM 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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