AutoCodes – Generic – P1402

P1402 Code - EGR Function Open

Quick Answer

This system controls flow rate of Exhaust Gas Recirculation (EGR) led from exhaust manifold to intake manifold. Common causes include Faulty EGR temperature sensor, EGR volume control valve harness is open or shorted, EGR volume control valve circuit poor electrical connection. 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 temperature sensor, EGR volume control valve harness is open or shorted, EGR volume control valve circuit poor electrical connection.
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 Popularity 55,350

How popular is this code, among other codes? Medium

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 19, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1402 Description

This system controls flow rate of Exhaust Gas Recirculation (EGR) led from exhaust manifold to intake manifold. The opening of the EGR by-pass passage in the EGR volume control valve changes to control the flow rate. A built-in step motor moves the valve in steps corresponding to the Engine Control Module (ECM) output pulses. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. The EGR volume control valve remains closed under the following conditions.
- Engine stopped
- Engine starting
- Engine idling
- Low engine coolant temperature
- Excessively high engine coolant temperature
- High engine speed
- Wide open throttle
- Low battery voltage

OBDII Code P1402 - EGR Function Open - AutoCodes.com — P1402 Code - EGR Function Open

What does this mean?

What are the Possible Causes of the DTC P1402?

Faulty EGR temperature sensor
EGR volume control valve harness is open or shorted
EGR volume control valve circuit poor electrical connection
EGR volume control valve leaking or stuck open

How to Fix the DTC P1402?

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 does this mean?

Code Tech Notes

Start by cleaning the EGR valve, if the code persists it may be necessary to replaced the EGR Valve.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1402 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.

Need more information about the P1402 code?

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Need Help with the Code?

Get the P1402 code diagnosed by a professional: Find a repair shop in your area

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

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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.