Cutlass Supreme V6-204 3.4L DOHC VIN X SFI (1995)
EGR Valve: All Technical Service Bulletins
PCM - MIL Illuminates/DTC P1403 Stored
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 57-65-01A
Date: September, 1996
Subject:
Malfunction Indicator Lamp Illuminates/DTC P1403 is Stored in the PCM (Replace PROM)
Models:
1994 Chevrolet Lumina from SOP - EOP
1995 Chevrolet Lumina
1994 Oldsmobile Cutlass Supreme - Built Prior to VIN RD337215
1995 Oldsmobile Cutlass Supreme
1994 Pontiac Grand Prix - Built Prior to VIN RF237349
1995 Pontiac Grand Prix with 3.4L Twin DOHC Engine (VIN X - RPO LQ1)
This bulletin is being revised to include the 1995 model year and to Change an incorrect PROM B/C code. Please discard Corporate Bulletin Number
57-65-01 (Section 6E - Engine Fuel & Emission).
Condition
Some owners of 1994 W cars equipped with a 3.4L twin DOHC engine (RPO LQ1 VIN X) built prior to the VIN breakpoints above may experience a
malfunction indicator light with a stored diagnostic trouble code (DTC) of P1403 (small EGR orifice). Also included are 1995 model year 3.4L engine
equipped vehicles. This condition could occur at altitudes above 5200 (1585 meters) feet above sea level.
Cause
The diagnostic self test run on the exhaust gas recirculation valve (EGR) was failing the EGR valve even though the valve itself was functioning
properly.
Correction
A new PROM has been released to address DTC P1403 that is set at altitudes greater than 5200 feet (1585 meters) above sea level.
Parts Information
Parts are currently available from GMSPO.
Warranty information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
J 6364
Prom, Replace
Use published labor
operation time.
