P0403 OBD-II Trouble Code: Exhaust Gas Recirculation Circuit Malfunction

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0403 code

P0403 is a diagnostic trouble code (DTC) for "Exhaust Gas Recirculation Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0403 DIAGNOSTIC Get a fair and transparent estimate upfront

P0403 code definition

Exhaust Gas Recirculation Circuit Malfunction

What the P0403 code means

P0403 is an OBD-II generic code that indicates that the engine control module (ECM) has detected the engine exhaust gas recirculation (EGR) circuit has malfunctioned. The ECM detected a short or open circuit in the EGR vacuum control solenoid or wiring to the solenoid.

What causes the P0403 code?

  • The ECM monitors the EGR vacuum control solenoid voltage and will detect a short or open circuit to the solenoid.

  • The EGR vacuum control solenoid is shorted or open internally.

  • The solenoid connection is corroded and losing connections.

What are the symptoms of the P0403 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory.
  • The engine may have pre-ignition on acceleration.
  • The engine EGR system will be disabled by the ECM.

How does a mechanic diagnose the P0403 code?

  • Scans codes and documents the freeze frame data in order to verify the problem.

  • Clears the engine codes and road tests the vehicle to verify whether the code comes back.

  • Visually checks the wiring and connections to the EGR control solenoid along with the EGR temperature sensor.

  • Disconnects and checks the EGR valve vacuum control solenoid for a short or open circuit in the solenoid.

  • Checks solenoid connection for corrosion in connection.

Common mistakes when diagnosing the P0403 code

  • Failing to disconnect the connection to the EGR control solenoid to check the connection for a corrosion buildup that could cause an open circuit to the ECM that could set this code.

  • Failing to check the wiring harness for cut wires causing an open circuit before replacing a good solenoid.

How serious is the P0403 code?

  • An EGR system that triggers this code IN the ECM will disable the EGR system and render it inoperative.

  • The Check Engine Light being on will cause the vehicle to fail emission testing and may cause the engine to ping on acceleration.

What repairs can fix the P0403 code?

  • Replacing the shorted or open EGR vacuum solenoid
  • Replacing a corroded connector to the EGR vacuum control solenoid
  • Repairing the wiring shorted to the EGR vacuum control solenoid

Additional comments for consideration regarding the P0403 code

Code P0403 is triggered when the EGR vacuum control solenoid is not making a complete and correct circuit to the ECM. When this happens, the ECM will turn off its control of the solenoid.

Need help with a P0403 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

P0403
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0403 code.

SCHEDULE P0403 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,064

Rating Summary
4,665
194
48
27
130
4,665
194
48
27
130

Mario

8 years of experience
22 reviews
Mario
8 years of experience
Chrysler PT Cruiser - Check Engine Light is on - Los Angeles, California
He was very courteous and knowledgeable. You can tell he knows his trade. Satisfied with his service.

Yoel

8 years of experience
91 reviews
Yoel
8 years of experience
Nissan Versa Note - Check Engine Light is on - Upper Darby, Pennsylvania
Yoel is very competent and provides great customer service. He took the time to explain and show me exactly what was going with my car. I will definitely use him again and recommend him to others.

Jason

31 years of experience
148 reviews
Jason
31 years of experience
Ford Explorer - Check Engine Light is on - Phoenix, Arizona
Jason was on time, friendly, explained everything he was doing and let me know the other services available, so when Jason comes back to install the new part I am having the oil changed too.

DeVaughn

25 years of experience
1 reviews
DeVaughn
25 years of experience
BMW X3 - Check Engine Light is on - Moreno Valley, California
The mechanic arrived on time, completed the work, which was replacement of an oxygen sensor, in a timely and professional manner.


Related questions

I have an intermittent misfire - 2002 Pontiac Grand Prix

Hi and thanks for contacting YourMechanic. The EGR can cause a misfire if it is stuck open when the engine is cold or running at a lower speed. The EGR replaces some of the air with burnt fuel to help...

Getting a P0430 code on my Buick Century 3100.

Hi there. The code p0403 is for the EGR circuit that shows it has malfunctioned. The code p0430 is for the catalytic converter showing that its below threshold. Check the harness to the EGR and make sure that all of...

Does not go into gear. 2002 Dodge Stratus

Hello. Code P0403 is the trouble code for an issue with the vehicle's EGR circuit. The EGR, short for exhaust gas re circulation, circuit is an emissions system that is responsible for recirculating exhaust gases in order to reduce N0x...

More related articles

10 Biggest Car-Related Headaches and What to Do About Them
You You don’t want to, but if you're a car owner it's inevitable that at some point you will experience car troubles. It's also fairly certain that the machine you rely on will cause you grief when you least expect...
P0004 OBD-II Trouble Code: Fuel Volume Regulator Control Circuit High
P0004 trouble code definition The P0004 code is associated with the electrical circuit which connects to your fuel system and is most...
P0238 OBD-II Trouble Code: Turbocharger Boost Sensor A Circuit High
P0238 code definition Turbocharger Boost Sensor A Circuit High What the P0238 code means P0238 is an OBD-II generic code triggered when...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com