U1003 Infiniti Code - Lost Communication With VVEL Control Module
Quick Answer
The Controller Area Network (CAN) is a serial communication line for real-time applications. Common causes include Faulty Variable Valve Event & Lift (VVEL) Control Module, VVEL Control Module harness is open or shorted, VVEL Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U1003 Infiniti indicates Lost Communication With VVEL Control Module.
- Common causes
- Common causes include Faulty Variable Valve Event & Lift (VVEL) Control Module, VVEL Control Module harness is open or shorted, VVEL Control Module circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code U1003 Infiniti Description
The Diagnostic Trouble Code (DTC) sets when a CAN communication signal other than OBD (emission-related diagnosis) is not received between Variable Valve Event & Lift (VVEL) control module and Engine Control Module (ECM) for 2 seconds or more.
What are the Possible Causes of the DTC U1003 Infiniti?
- Faulty Variable Valve Event & Lift (VVEL) Control Module
- VVEL Control Module harness is open or shorted
- VVEL Control Module circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC U1003 Infiniti?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U1003 Infiniti code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about U1003 Infiniti Code
1. What are the common symptoms of OBDII code U1003 in an Infiniti related to lost communication with the VVEL control module?
- Common symptoms include engine misfires, reduced power, stalling, and the illumination of the check engine light.
2. What are some possible causes of OBDII code U1003 in an Infiniti indicating a communication issue with the VVEL control module?
- Possible causes may include a faulty VVEL control module, damaged wiring or connectors, or a communication network issue within the vehicle.
3. How can I diagnose the source of the communication problem with the VVEL control module triggering code U1003 in my Infiniti?
- Diagnosing the issue may involve checking the wiring and connectors for damage, verifying power and ground connections, and using a scan tool to assess communication on the network.
4. Can a DIY enthusiast repair OBDII code U1003 related to lost communication with the VVEL control module in an Infiniti?
- While basic checks like inspecting wiring connections can be done by DIY enthusiasts, resolving complex communication issues often requires advanced diagnostic tools and expertise.
5. Is it safe to drive my Infiniti with OBDII code U1003 present due to a VVEL control module communication problem?
- It is not recommended to drive the vehicle with this code active, as it can lead to performance issues and potential safety risks. Prompt diagnosis and repair are advised.
6. What are some possible repair tips for addressing OBDII code U1003 linked to communication loss with the VVEL control module in an Infiniti?
- Repair tips may include checking and repairing damaged wiring, ensuring proper connections, resetting the code, and retesting to verify the issue has been resolved.
7. Can a software update fix OBDII code U1003 caused by lost communication with the VVEL control module in an Infiniti?
- In some cases, a software update from the manufacturer may address communication issues, so it's worth consulting with a dealership or professional technician for guidance.
8. How does the VVEL control module communicate with other systems in an Infiniti, and what role does it play in the vehicle's operation?
- The VVEL control module communicates with various engine management systems to regulate valve lift and timing, optimizing performance and fuel efficiency in the vehicle.
9. Are there any common issues or known problems with the VVEL control module in Infiniti vehicles that could trigger OBDII code U1003?
- Over time, the VVEL control module may experience internal faults or failures, leading to communication issues that trigger OBDII code U1003.
10. What steps should be taken after resolving OBDII code U1003 related to lost communication with the VVEL control module in an Infiniti to ensure the problem does not recur?
- After repairs, it is recommended to clear the fault code, perform a thorough test drive to confirm the issue is resolved, and monitor the vehicle for any reoccurrence of the code.
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