Mechanics

OBD2 CODE P1404

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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Jramirezz
March 28, 2009.




Hope this help

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

BMRFIXIT
Mar 28, 2009.


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