P1402 Code - EGR Function Open
Quick Answer
The P1402 diagnostic trouble code (DTC) indicates an issue with the Exhaust Gas Recirculation (EGR) system in the vehicle. Common causes include Faulty EGR valve, Clogged or dirty EGR passages, Wiring or electrical issues in the EGR system. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P1402 indicates EGR Function Open.
- Common causes
- Common causes include Faulty EGR valve, Clogged or dirty EGR passages, Wiring or electrical issues in the EGR system.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
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Code P1402 Description
The P1402 diagnostic trouble code (DTC) indicates an issue with the Exhaust Gas Recirculation (EGR) system in the vehicle. The EGR system is responsible for reducing nitrogen oxide emissions by recirculating a portion of the exhaust gases back into the engine's intake manifold. This process helps lower combustion temperatures and prevent the formation of harmful pollutants.
Common Causes of P1402
- Faulty EGR valve
- Clogged or dirty EGR passages
- Wiring or electrical issues in the EGR system
- Vacuum leaks in the EGR system
- Carbon buildup in the EGR valve or passages
Symptoms of P1402
- Check Engine Light illuminated on the dashboard
- Rough idling or stalling when the vehicle is at a stop
- Decreased fuel efficiency
- Engine knocking or pinging noises
- Reduced engine power or acceleration
How to Fix P1402
- Begin by performing a visual inspection of the EGR valve and system components to check for any obvious signs of damage, clogging, or leaks.
- Use a scan tool to monitor the EGR valve position and operation while the engine is running to determine if it is functioning correctly.
- Clean or replace the EGR valve and passages if they are clogged with carbon buildup.
- Test the EGR system for vacuum leaks and repair or replace any damaged hoses or connections.
- Reset the ECU (Engine Control Unit) to clear the code and ensure the repair has been successful.
Cost to Fix P1402
The cost of repairing a P1402 code related to the EGR function open can vary depending on the vehicle make and model, the extent of the issue, and labor rates in your area. On average, you can expect to pay between $200 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to obtain quotes from multiple sources to ensure you get the best deal.
Tech Notes for P1402
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Code P1402 Information for Specific Makes
- P1402 Audi — EGR Vacuum Regulator Solenoid Valve Short To Positive
- P1402 BMW — Heated Catalyst Power Switch Overtemperature Condition Bank 1
- P1402 Buick — Exhaust Gas Recirculation Supply Circuit
- P1402 Cadillac — Exhaust Gas Recirculation Supply Circuit
- P1402 Chevrolet — Exhaust Gas Recirculation Supply Circuit
- P1402 Ford — EGR Metering Orifice Restricted
- P1402 GMC — Exhaust Gas Recirculation Supply Circuit
- P1402 Hyundai — DMTL Motor Circuit
- P1402 Infiniti — EGR Function Open
- P1402 KIA — Leak Detection Module Pump Circuit Malfunction
- P1402 Lincoln — EGR Metering Orifice Restricted
- P1402 Mazda — EGR Valve Position Sensor Circuit
- P1402 Mercedes-Benz — Exhaust Gas Recirculation Open-Loop Control
- P1402 Mercury — EGR Metering Orifice Restricted
- P1402 Nissan — EGR Function Open
- P1402 Subaru — Fuel Level Sensor Circuit Malfunction
- P1402 Volkswagen — EGR Vacuum Regulator Solenoid Valve Short To Positive
Frequently Asked Questions about P1402 Code
1. What are common symptoms of OBDII code P1402 (EGR Function Open)?
- Common symptoms include rough idle, engine hesitation, decreased fuel efficiency, and an illuminated check engine light.
2. What causes OBDII code P1402 to trigger?
- This code is triggered when the Engine Control Module (ECM) detects an open circuit in the Exhaust Gas Recirculation (EGR) valve control circuit.
3. How can I diagnose the cause of OBDII code P1402?
- Diagnosing the issue involves checking the EGR valve for proper operation, inspecting the wiring and connectors for damage, and testing the EGR valve control solenoid.
4. Can a dirty EGR valve cause OBDII code P1402?
- Yes, a dirty or clogged EGR valve can cause insufficient EGR flow, leading to code P1402. Regular maintenance of the EGR valve is important to prevent such issues.
5. What are the repair options for OBDII code P1402?
- Repair options include cleaning or replacing the EGR valve, repairing damaged wiring or connectors, and replacing the EGR valve control solenoid if faulty.
6. Is it safe to continue driving with OBDII code P1402 present?
- It is not recommended to drive with this code active, as it can lead to poor engine performance and potential damage over time. It is best to address the issue promptly.
7. Can a malfunctioning EGR system affect vehicle emissions?
- Yes, a malfunctioning EGR system can lead to increased emissions of harmful pollutants, potentially causing the vehicle to fail emissions testing.
8. Are there any preventive measures to avoid OBDII code P1402?
- Regular inspection and maintenance of the EGR system can help prevent issues that may trigger code P1402. Keeping the system clean and well-maintained is key.
9. How long does it typically take to repair OBDII code P1402?
- The repair time can vary depending on the exact cause of the issue. Simple fixes like cleaning the EGR valve may take less time, while more complex repairs could take longer.
10. Can OBDII code P1402 be a recurring problem?
- If the underlying cause of the code is not properly addressed, it can recur. Ensuring a thorough diagnosis and complete repair is essential to prevent the code from coming back.
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