Hey guys I got a CEL on my car this past weekend and was going to take it in the next day to Autozone and have them scan it. Well the following day I woke up and it was gone, so if figured it was all good. Then today when I got in the car, up it came again. So on the way to work I drove over to Auto Zone and had them scan it ...

The code: P0403

According to the sticky that means:

DTC P0403: EGR Control Circuit

Now my car only has 6,000 miles on it and is pretty much stock (only suspension mods and wheels) ... anyone have any ideas of why its getting this code and can someone please explain to me what it means.

Thanks!

 

here is a good thread I found on EGR related problems:


http://www.mycgiproxy.com/browse/ind...dobGlnaHQ9ZWdy

 

^ Thanks but thats all on the P0401 .... mine is a P0403 ... Circut Malfunction.

 

Well it describes the whole EGR system on the first page.....how to test it and such. Maybe try searching more.

 

Or....maybe just bring it in to the dealer since you are still under warranty.

 

Yea I think im going to do that ... just wondering what the problem is before hand so I dont get BSed by the dealership.

 

Here is some info copied from the manual (sorry I can't scan the images)....

DTC P0403: EXHAUST GAS RECIRCULATION CONTROL CIRCUIT

CIRCUIT OPERATION
• The EGR vacuum regulator solenoid valve power is supplied from the MFI relay (terminal No. 4).
• The ECM controls the EGR vacuum regulator solenoid valve ground by turning the power transistor in the ECM "ON" and "OFF".
.
TECHNICAL DESCRIPTION
• To judge if there is open circuit in the EGR vacuum regulator solenoid valve drive circuit, ECM measures the surge voltage of the EGR vacuum regulator solenoid valve coil.
• The ECM drives the EGR vacuum regulator solenoid valve. After the solenoid is turned off, the ECM will check if the solenoid coil produces a surge voltage of 2 volts or more.
.
DTC SET CONDITIONS
Check Conditions
• Engine is being cranked.
• Battery positive voltage is at between 10 and 16 volts.

Judgment Criteria
• The EGR vacuum regulator solenoid valve coil surge voltage (battery positive voltage + 2 volts) is not detected for 0.2 second.

The ECM monitors for this condition once during the drive cycle.
Check Conditions
• Battery positive voltage is at between 10 and 16 volts.
• ON duty cycle of the EGR vacuum regulator solenoid valve is between 10 and 90 percent.
• ON duty cycle of the evaporative emission purge solenoid is 0 percent.
• Evaporative emission ventilation solenoid is OFF.
• More than 1 second has elapsed after the above mentioned conditions have been met.

Judgment Criteria
• The EGR vacuum regulator solenoid valve coil surge voltage (battery positive voltage + 2 volts) is not detected for 1 second. When the EGR vacuum regulator solenoid valve is turned OFF.
.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
• EGR vacuum regulator solenoid valve failed.
• Open or shorted EGR vacuum regulator solenoid valve circuit, harness damage, or connector damage.
• ECM failed.

 

^Thanks thats some real good info.

 

Just an update for anyone else that gets this error code....

I took the car into the dealer and they are going to replace the EGR valve becuase its faulty.