[SOLVED] U0120 Code: How To Fix Lost Communication With Starter Module

The automobile fault code U0120 indicates a problem with the StarterGenerator Control Module, which can cause the engine light to turn on.

The cause of this issue could be a faulty module, an open or shorted harness, or poor electrical connections.

It is important to visually inspect the wiring harness and connectors for any damage or corrosion. The repair time for this issue is estimated to be around 1.0. To interpret the fault code, it is recommended to check the “Possible Causes” listed above and follow the suggested fix accordingly.

Repair Importance Level	10.0 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	10.0 (Out of 10)

Decode U0120: Unveiling Symptoms Of This Fault Code

If you notice the Engine Light ON (or Service Engine Soon Warning Light), it could be a sign of u0120 fault code. Here are the symptoms to look out for:

The automobile fault code U0120 has the following symptoms: – Engine Light ON (or Service Engine Soon Warning Light) – Loss of communication with the Anti-Lock Brake System (ABS) Control Module – Loss of communication with the Power Steering Control Module – Loss of communication with the Transmission Control Module (TCM) – Loss of communication with the Vehicle Dynamics Control (VDC) Module – Loss of communication with the Engine Control Module (ECM) – Loss of communication with the Fuel Pump Control Module – Loss of communication with the Instrument Panel Cluster (IPC) Control Module.

Decoding U0120: Common Causes Of The Fault Code

The automobile fault code u0120 can be caused by a faulty control module, open or shorted harness, or poor electrical connection.

The automobile fault code u0120 can be caused by a faulty Starter/Generator Control Module.
It can also be caused by an open or shorted Starter/Generator Control Module harness.
Additionally, a poor electrical connection in the Starter/Generator Control Module circuit can also trigger this fault code.

Fix U0120: Simple Steps To Solve The Fault Code

To fix the u0120 fault code, check the possible causes and inspect related wiring harness, connectors, and components for damage.

To fix the automobile fault code u0120, first, check the possible causes listed above.
Then, visually inspect the related wiring harness and connectors.
Look for 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.

Crunching The Numbers: U0120 Diagnosis Cost & Complexity

The automobile fault code U0120 can be diagnosed and fixed within an estimated repair time of 1.0 hour. The cost of repair is influenced by the hourly rate charged by the auto repair shop, which typically ranges between $75 and $150 per hour. Therefore, the total cost of diagnosis and fixing the U0120 fault code will depend on the hourly rate charged by the auto repair shop and the estimated repair time required to fix the issue.

Decoding U0120: Understanding The Lost Communication With Abs Module

The U0120 code is a Controller Area Network (CAN) fault code. CAN is a vehicle bus standard designed to interconnect automotive devices without a host computer. The U0120 code sets when a periodic message from the Starter Generator Control Module has not been received.

CAN bus uses two dedicated wires for communication, CAN high and CAN low. The Diagnostic Trouble Code (DTC) sets when there is a lost communication with the Starter Generator Control Module.

The CAN bus is not sensitive to inductive spikes, electrical fields, or other noise.

FAQ

What are the possible causes of the u0120 automobile fault code?

If your engine light is on and you’re seeing the u0120 fault code, it could be due to a faulty Starter/Generator Control Module, an open or shorted harness, or poor electrical connection in the 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 u0120 fault code?

If you’re experiencing the u0120 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 Starter/Generator Control Module, an open or shorted harness, or a poor electrical connection in the circuit. To address this problem, you should 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 will help you identify the issue and take the necessary steps to fix it.

What are the signs that the Starter / Generator Control Module circuit has a poor electrical connection causing the u0120 fault code?

If the Starter / Generator Control Module circuit has a poor electrical connection causing the u0120 fault code, the engine light or service engine soon warning light will turn on. The cause of this issue could be a faulty Starter / Generator Control Module, an open or shorted harness, or a poor electrical connection in the circuit. To fix this problem, it is recommended 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.

Wrap Up

If your engine light is on, it could be due to a faulty StarterGenerator Control Module, an open or shorted harness, or poor electrical connection.

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