[SOLVED] U0078 Code: Fixing Low Speed Can Bus Communication

The automobile fault code U0078 is a Diagnostic Trouble Code (DTC) that triggers the Engine Light ON or Service Engine Soon Warning Light. The cause of this fault code can be a faulty Control Module, open or shorted Control Module harness, or poor electrical connection in the Control Module circuit. To fix this issue, one needs to visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

The repair time for this fault code is 1.0.

It is essential to diagnose and fix this issue promptly to avoid further damage to the vehicle.

To interpret the fault code, one needs to check for more codes and examine the vehicle symptom(s).

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 u0078 fault code.

Here are the symptoms to look out for:

  • The fault code U0078 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 ABS system, problems with the traction control system, and difficulty shifting gears.
  • Additionally, the vehicle may experience a decrease in fuel efficiency, reduced power, and poor acceleration.
  • It is important to address these symptoms promptly to prevent further damage to the vehicle and ensure safe driving conditions.

The automobile fault code u0078 can be caused by a range of issues, including a faulty control module and poor electrical connections.

  • The automobile fault code u0078 can be caused by various factors.
  • These include diagnosing the DTC through the vehicle symptom(s), checking for more codes, a faulty Control Module, an open or shorted Control Module harness, and poor electrical connection in the Control Module circuit.
  • It is important to consider all of these causes when attempting to diagnose and fix the issue.

To fix the u0078 automobile fault code, check the possible causes and inspect related wiring harness and connectors for damage.

  • To fix the automobile fault code u0078, 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 fault code U0078 is related to the communication system of the vehicle. The diagnosis cost may vary depending on the auto repair shop, but it is usually charged per hour. The estimated repair time for this fault code is 1.0 hour.

The fixing cost will depend on the hourly rate charged by the auto repair shop, which can range from $75 to $150 per hour.

These factors should be taken into consideration when estimating the total cost of fixing the U0078 fault code.

The U0078 code is related to the low speed General Motor Local Area Network (GMLAN) serial data bus. This code indicates that the control module is experiencing communication issues on the low speed CAN bus.

The Diagnostic Trouble Code (DTC) sets when the device setting the DTC has attempted to establish communications on the serial data circuits more than 3 times in 5 s. If this code appears, it means that the control module is unable to communicate with other devices on the low speed CAN bus.

What are the possible causes of the u0078 automobile fault code?

If you see the engine light on or the service engine soon warning light, it could be due to the u0078 fault code. This code is diagnosed by checking the vehicle’s symptoms and looking for other codes. The possible causes include a faulty control module, an open or shorted control module harness, or a poor electrical connection in the control module 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 the faulty control module be fixed in case of the u0078 fault code?

If you’re experiencing the u0078 fault code, which is indicated by the engine light being on, it could be due to a faulty control module or poor electrical connection. To fix this issue, start by visually inspecting the wiring harness and connectors for any damage or corrosion. Check for broken, bent, or pushed out connector pins. It’s also important to diagnose any other potential codes that may be contributing to the issue.

What steps should be taken to visually inspect the related wiring harness and connectors in case of the u0078 fault code?

If you encounter the u0078 fault code, which is indicated by the Engine Light ON or Service Engine Soon Warning Light, you should visually inspect the related wiring harness and connectors. This is because the cause of this Diagnostic Trouble Code (DTC) could be a faulty Control Module, an open or shorted Control Module harness, or a Control Module circuit with poor electrical connection. To fix this issue, check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

u0078 error fault code explained

If your engine light is on and showing the u0078 code, check for more codes and inspect the wiring harness and connectors for any damage or corrosion. This could be caused by a faulty control module or poor electrical connection. Take action by visually inspecting and fixing any issues found.

Scroll to Top