The automobile fault code U1003 indicates a problem with the Variable Valve Event & Lift (VVEL) Control Module or its circuitry. 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 VVEL Control Module, an open or shorted harness, or a poor electrical connection.

It could also be caused by a faulty Engine Control Module (ECM). The repair importance is high as it affects the engine’s performance. 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 pins.

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 a sign of u1003 fault code. Here are the symptoms to look out for:

  • The u1003 fault code in an automobile can cause the following symptoms: Engine Light ON, Service Engine Soon Warning Light ON.

The automobile fault code u1003 can be caused by a faulty VVEL Control Module, open or shorted harness, poor electrical connection, or a faulty ECM.

  • The automobile fault code u1003 can be caused by a faulty Variable Valve Event & Lift (VVEL) Control Module.
  • It can also be caused by an open or shorted VVEL Control Module harness.
  • Another cause could be a poor electrical connection in the VVEL Control Module circuit.
  • Lastly, a faulty Engine Control Module (ECM) can also trigger the u1003 fault code.

To fix the u1003 automobile fault code, check the possible causes and inspect related wiring harness and connectors for damage or corrosion.

  • To fix the automobile fault code u1003, 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 U1003 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 fixing the U1003 fault code will depend on the hourly rate charged by the repair shop and the estimated repair time required to diagnose and fix the issue.

The U1003 fault code indicates a communication problem between the VVEL control module and the Engine Control Module (ECM). The Controller Area Network (CAN) is a communication line that connects the two modules.

If the ECM does not receive a signal from the VVEL control module for 2 seconds or more, the U1003 code is triggered.

This code is not related to emissions and is considered a non-OBD diagnostic trouble code.

What are the possible causes of the u1003 automobile fault code?

If you’re experiencing the u1003 fault code, you may notice that your engine light is on. This could be due to a faulty Variable Valve Event & Lift (VVEL) Control Module, an open or shorted VVEL Control Module harness, a poor electrical connection in the VVEL Control Module circuit, or a faulty Engine Control Module (ECM). To fix the issue, it’s recommended to 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 the VVEL Control Module harness be checked for faults in case of the u1003 fault code?

If you’re experiencing the u1003 fault code, indicated by the engine light or service engine soon warning light turning on, it could be due to a faulty VVEL Control Module or its harness. To fix this issue, you should check for possible causes such as poor electrical connection, open or shorted harness, or a faulty ECM. Visually inspect the wiring harness and connectors for any damage or corrosion, and check for broken or bent pins.

Is it necessary to replace the Engine Control Module (ECM) in case of the u1003 fault code, or can it be fixed by repairing the faulty components?

It is not necessary to replace the Engine Control Module (ECM) in case of the u1003 fault code. The fault can be fixed by repairing the faulty components such as the Variable Valve Event & Lift (VVEL) Control Module, VVEL Control Module harness, or the ECM itself. To fix the issue, one should visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

u1003 error fault code explained

If your engine light is on, it could be due to a faulty Variable Valve Event & Lift (VVEL) Control Module, open or shorted VVEL Control Module harness, poor electrical connection in the VVEL Control Module circuit, or a faulty Engine Control Module (ECM).

Visually inspect the wiring harness and connectors for damage and check for broken, bent, pushed out, or corroded connector pins.

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