[SOLVED] U1806 Code: Fix High Voltage Energy Management Can Bus Off

The automobile fault code U1806 indicates a problem with the Battery Energy Control Module or its related components. 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 Battery Energy Control Module, an open or shorted harness, or a poor electrical connection. The repair importance is high as it affects the performance of the vehicle’s hybrid powertrain. The repair difficulty is moderate, and the repair time is estimated at 1.0 hour.

To fix the issue, one should visually inspect the wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

It is essential to check the “Possible Causes” listed above to interpret the fault code correctly.

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 u1806 fault code. Here are the symptoms to look out for:

  • The U1806 fault code in an automobile can cause several symptoms, including the engine light turning on or the service engine soon warning light appearing.
  • Other symptoms may include issues with the transmission, such as difficulty shifting gears or the transmission slipping.
  • The vehicle may also experience a decrease in power or acceleration, and the engine may stall or hesitate during operation.
  • Additionally, the vehicle’s fuel efficiency may decrease, and there may be issues with the vehicle’s emissions.

The automobile fault code u1806 can be caused by a faulty battery energy control module, open or shorted harness, poor electrical connection, or a faulty hybrid powertrain control module 2.

  • The automobile fault code U1806 can be caused by a faulty Battery Energy Control Module.
  • It can also be caused by an open or shorted harness in the Battery Energy Control Module.
  • Another cause can be a poor electrical connection in the Battery Energy Control Module circuit.
  • Lastly, a faulty Hybrid Powertrain Control Module 2 can also cause the U1806 fault code.

Below are some possible fixes for the automobile fault code u1806, including inspecting wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code u1806, 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 U1806 can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of repair is influenced by the repair time, which is commonly charged between $75 and $150 per hour by most auto repair shops. Therefore, the total cost of fixing the U1806 fault code will depend on the hourly rate charged by the repair shop and the estimated repair time required to fix the issue.

The U1806 code is related to the high voltage energy management high-speed GMLAN serial data circuits in automobiles. These circuits are used to communicate information between the Hybrid Powertrain Control Module 2, the Battery Energy Control Module, and the Battery Charger. If this serial data system is inoperative, the devices will not communicate with each other on this bus, but they still communicate with the scan tool through high-speed GMLAN bus.

The Diagnostic Trouble Code (DTC) will set when the device setting the DTC has attempted to establish communications on the serial data circuits for more than 1.4 seconds without success.

What are the possible causes of the u1806 automobile fault code?

If you’re experiencing an illuminated engine light or service engine soon warning light, the u1806 fault code may be the culprit. This code is often caused by a faulty battery energy control module, an open or shorted harness, poor electrical connection, or a faulty hybrid powertrain control module 2. To fix the issue, it’s recommended to visually inspect the wiring harness and connectors for any damage or corrosion, and check for broken or bent pins.

How can one visually inspect the related wiring harness and connectors to fix the u1806 fault code?

If you’re experiencing the u1806 fault code, which is indicated by the engine light being on or the service engine soon warning light, there are a few possible causes. These include a faulty battery energy control module, an open or shorted harness, poor electrical connection, or a faulty hybrid powertrain control module 2. To fix the issue, start by visually inspecting the related wiring harness and connectors. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.

Is a faulty Hybrid Powertrain Control Module 2 a common cause of the u1806 fault code?

The u1806 fault code, indicated by the engine light or service engine soon warning light, may be caused by a faulty Hybrid Powertrain Control Module 2. Other possible causes include a faulty Battery Energy Control Module, open or shorted harness, or poor electrical connection. To fix the issue, inspect the related wiring harness and connectors for damage or corrosion, and check for broken or bent pins.

u1806 error fault code explained

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to a faulty Battery Energy Control Module or a poor electrical connection.

Check the wiring harness and connectors for damage and inspect the related components.

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