U1003 Nissan 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 Nissan 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 Nissan 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 Nissan?
- 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 Nissan?
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 Nissan 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 Nissan Code
1. What does the OBDII code U1003 mean on a Nissan?
U1003 indicates a "Lost Communication With VVEL Control Module," meaning the vehicle’s main control systems are not receiving communication from the Variable Valve Event & Lift (VVEL) control module.
2. What are common symptoms of the U1003 code on a Nissan?
Symptoms may include poor engine performance, reduced power, rough idling, stalling, or the Check Engine Light being illuminated.
3. What causes the U1003 code to appear on a Nissan vehicle?
Common causes include a faulty VVEL control module, wiring issues like damaged or corroded harnesses, poor electrical connections, or issues with the CAN (Controller Area Network) communication system.
4. Can I still drive my Nissan with the U1003 code active?
While the car may still drive, continued operation can lead to reduced performance, potential engine damage, or unsafe driving conditions. It’s best to address the issue promptly.
5. How do I diagnose the U1003 code on a Nissan?
Start by scanning for codes with a diagnostic tool. Inspect the VVEL control module, wiring, and connectors for damage or corrosion. Check the CAN communication system for faults.
6. How can the U1003 code be repaired on a Nissan?
Repairs may involve fixing or replacing damaged wiring, cleaning corroded connectors, reprogramming the VVEL control module, or replacing the faulty module if necessary.
7. Is the U1003 code specific to certain Nissan models?
While it can occur in various Nissan models, it is more commonly found in those equipped with VVEL systems, such as certain Infiniti and Nissan performance vehicles.
8. Can a weak battery cause the U1003 code on a Nissan?
Yes, a weak or failing battery can cause communication errors, including U1003, by disrupting the electrical supply to the VVEL control module.
9. What tools are needed to fix the U1003 code on a Nissan?
You’ll need an OBDII scanner, a multimeter for testing electrical connections, and potentially a specialized tool for reprogramming or resetting control modules.
10. How much does it cost to fix the U1003 code on a Nissan?
Repair costs can vary depending on the exact issue. Simple wiring repairs may cost under $200, while replacing the VVEL control module could cost $1,000 or more, including labor.
Discuss the causes and fixes for U1003 Nissan OBDII Code
-
The VVEL relay and the VVEL module so far. I have cleaned all fuses and connection as I can see.
still starts in Limp mode with error P1606 and U1003 codes. -
Let me check if I can find more information. What model and year is your Nissan?
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