P1403 – EGR System Control Difference (Audi, VW)

Brian Jones

By Brian Jones (Contact Me)
Last Updated 2019-02-20

Trouble CodeFault LocationProbable Cause
P1403 EGR System Control Difference (AUDI, VOLKSWAGEN)
Carbon Canister Shut Off Valve Control Circuit Electrical (BMW)
Exhaust Gas Recirculation System Valve 1 (BUICK, CADILLAC, CHEVROLET, GMC)
5 volt reference voltage to EGR valve missing (CHRYSLER, DODGE, JEEP)
Differential Pressure Feedback Electronic Sensor Hoses Reversed (FORD, LINCOLN, MERCURY)
DMTL Valve Circuit (HYUNDAI)
Leak Detection Module Solenoid Valve Circuit Fault (KIA)
DPFE Hoses Reversed (MAZDA)

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What Does Code P1403 Mean?

The vehicle’s exhaust gas recirculation (EGR) system is an emissions control in many modern vehicles. Its main purpose is to recirculate exhaust gas back to the intake and reduce cylinder temperatures while lowering NOx emissions. The EGR valve is the main component controlling the recirculation and flow of the exhaust. When the valve is open, the gas flows freely through the EGR system. Otherwise, the operation and flow of the exhaust gases are hindered which leads to performance and emissions concerns.

This code indicates that there is a fault or trouble somewhere in the EGR System. It could even be within the valve itself. It could also be related to a faulty EGR valve, blocked EGR passages, an open or shorted EGR valve harness, poor electrical connections of the EGR valve circuit or just an issue with the EGR valve hose connections.

Where is the P1403 sensor located?

The EGR valve is found either on or near the intake manifold.

What are the common causes of code P1403?

  • Faulty EGR valve
  • Loose EGR valve hose connections
  • Blocked EGR passages
  • Open or shorted EGR valve
  • Poor electrical connection of the EGR valve circuit

How expensive is it to fix code P1403?

This depends on what the problem actually is. If you can clean the valve, clean the passageways or repair the connector, you aren’t looking at a lot of money. If, however, you need to replace the entire valve, you might face a price of anywhere between $60 and $500 just for the part. If you factor in labor costs, you could look at another $150 to $500.

What are the symptoms of code P1403?

  • Reduced acceleration
  • Reduced power
  • Decrease in fuel economy
  • Rough idle
  • Check Engine Light on

What are common solutions to code P1403?

The solution depends on what the problem turns out to be. You can start by cleaning the passageways and valve. From there, you may find a wire or connector that needs to be repaired. The most significant solution would be to replace the EGR valve itself.

How serious is code P1403?

This depends on how well the vehicle is running. Either way, you’ll be increasing emissions, but you might also have trouble with a rough idle, hesitation and possibly even a stalling engine. This could quickly become worse so you shouldn’t wait for repair.

How safe is it to still drive the car with code P1403?

While the car might be drivable, you could cause an accident on the road when your engine stalls or runs roughly. If you were to stall in the middle of an intersection, it could be a deadly situation.

How difficult is it to repair code P1403?

Some car models have an accessible EGR valve while others make it more difficult to find. If you can get to it, most times, it doesn’t take much to replace it. Depending on your car, you might need some special tools to remove the nuts and bolts or other components so you can gain access to the EGR valve. If your valve is easily accessible, you simply unbolt the old valve and install a new one. Once you have the valve off, it’s also a simple process to clear the EGR passageways.

What are the common mistakes when repairing code P1403?

Rust is often present on the mounting nuts and bolts, so it’s wise to use penetrating oil before attempting removal. You also want to use care when working with hot exhaust components. Check all the passages for carbon deposits and clean them during the valve replacement.

How do you troubleshoot code P1403?

  • OBD II scan tool
  • Wrenches and sockets to remove the EGR valve
  • Cleaner for passageways and parts

Codes Related to P1403

  • P0400: Exhaust gas recirculation (EGR) system -flow malfunction
  • P0401: Exhaust gas recirculation (EGR) system -insufficient flow detected
  • P0402: Exhaust gas recirculation (EGR) system -excessive flow detected
  • P0403: Exhaust Gas Recirculation “A” Control Circuit
  • P0489: Exhaust Gas Recirculation “A” Control Circuit Low
  • P0490: Exhaust Gas Recirculation “A” Control Circuit High

Other Manufacturer Specific Definitions for P1403

Exhaust Gas Recirculation Error (EGR Solenoid 1) Conditions (GM)
Differential Pressure Feedback Electronic Sensor Hoses Reversed (Ford)
Exhaust gas recirculation (EGR) system - control difference (Volkswagen)
Exhaust gas recirculation (EGR) system - control difference (Audi)
Idle Air Control Actuator 2 Target Position Fault (BMW)
Exhaust gas recirculation (EGR) valvesolenoid 1 (Buick)
Exhaust Gas Recirculation System Valve 1 (Cadillac)
Exhaust gas recirculation (EGR) solenoid 1circuit malfunction (Chevrolet)
Exhaust gas recirculation (EGR) valve position sensor no 5 volt supply (Chrysler)
Exhaust gas recirculation (EGR) system -malfunction (Dodge)
Exhaust gas recirculation (EGR) system -malfunction (Freightliner)
Fuel tank leakage diagnostic module – valve malfunction (Hyundai)
Exhaust gas recirculation (EGR) valve position sensor no 5 volt supply (Jeep)
Evaporative emission (EVAP) leak detection module solenoid – circuit malfunction (Kia)
Pressure transducer – hoses transposed (Land Rover)
Exhaust gas recirculation (EGR) pressure sensor (Lincoln)
Differential pressure feedback sensor – hoses reversed (Mazda)
Differential Pressure Feedback Electronic Sensor Hoses Reversed (Mercury)
Exhaust gas recirculation (EGR) valve solenoid 1 (Oldsmobile)
Exhaust gas recirculation (EGR) valve position sensor no 5 volt supply (Plymouth)
Exhaust gas recirculation (EGR) solenoid 1circuit malfunction (Pontiac)
Exhaust gas recirculation (EGR) solenoid -voltage low (Saturn)

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