P0403 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

Thread Tools Search this Thread
Old 09-24-2009, 07:57 PM   #1
Retired Senior Admin

Expert Gearhead
Thread Starter
Danthurs's Avatar
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default P0403



PCM monitors EGR valve pintle position input to ensure that
valve responds properly to commands from PCM. The EGR (linear) valve
is controlled by using an ignition positive driver and ground circuit
within the PCM. The driver has the ability to detect an electrical
malfunction in the ignition positive or ground circuit, then signal
the PCM to set the DTC.

A fault in the control circuit, will leave no noticeable symptoms other than the Service Engine Soon (SES) light. If the EGR control solenoid is stuck open the code may be accompanied by misfire under acceleration, rough idle, or engine stalling.

  • Bad EGR solenoid
  • Resistance in control circuit (PCM controlled ground) due to damage to the wiring harness
  • Poor connection at the EGR solenoid harness
  • Corrosion at the EGR solenoid harness
  • Stuck pintle
Possible Solutions
  • Check wires and harness for shorts or loose connections.
  • Remove EGR valve and clean pintle
  • Replace EGR valve
Danthurs is offline  

Related Topics
Thread Thread Starter Forum Replies Last Post
EGR codes: P0403 & P0404 tomgreco 1992-1999 9 07-29-2009 12:24 PM

obd2, obdii, p0403, p403

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 12:50 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.