1999 GMC SUBURBAN OBD2 CODE P1404

  • Tiny
  • Jramirezz
  • 1999 GMC SUBURBAN

Engine Performance problem
1999 GMC Suburban V8 Two Wheel Drive Automatic 122000 miles

i am getting code p1404 egr pintle valve stuck open, I replaced the egr valve, and after 20 miles driving it, the same code came back, does the egr vacuum selenoid have something to do with this? Or am I miising something? Please advice

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Saturday, March 28th, 2009 AT 7:47 PM

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  • Tiny
  • BMRFIXIT
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ENG OBD II DTC P1404 - REFLASH VCM
TECHNICAL SERVICE BULLETIN
Reference Number(s): 86-65-03, Date of Issue: July, 1998 Related Ref Number(s): 86-65-03
ARTICLE BEGINNING
OBD II DIAGNOSTIC TROUBLE CODE (DTC) P1404 (REFLASH VCM)
Model(s): 1998* -99 Chevrolet and GMC C/K, M/L, S/T**, G, P Models with 4.3L, 5.0L, 5.7L, 7.4L Engine (VINs X, W, M, R, J - RPOs LF6, L35, L30, L31, L29)
* (C/K, G with RPO ZK3) ** (Does not include RPO ZN4)
1998 Oldsmobile Bravada with 4.3L, 5.0L, 5.7L, 7.4L Engine (VINs X, W, M, R, J - RPOs LF6, L35, L30, L31, L29)
Section: 6E - Engine Fuel & Emission
Bulletin No: 86-65-03
Date: July, 1998
CONDITION
Some vehicles may set a false OBD II DTC P1404.
CAUSE
Electronic noise in the vehicle may create momentary false "low" exhaust gas recirculation (EGR) pintle position feedback signal values. Severe occurrences may cause the vehicle control module (VCM) to set a P1404 DTC because the VCM perceives that the EGR valve is stuck open.
CORRECTION
1. Using the Tech 2 Scan Tool, exercise the EGR valve and verify the valve's actual and desired position track. 2. Following steps 1, 2 and 3 of the Strategy Based Diagnostics, determine if the vehicle has an actual EGR valve condition. If there is a valve condition, perform the appropriate repair procedures. 3. Finally, reflash the VCM with the new software and corresponding calibrations

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Saturday, March 28th, 2009 AT 8:17 PM

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