G 2500 3/4 Ton Van V8-305 5.0L VIN M SFI (1997)
Engine Control Module: Customer Interest
Engine Controls - VCM/PCM Water Intrusion
Bulletin No.: 02-06-04-020B
Date: October 06, 2003
INFORMATION
Subject:
VCM/PCM Replacement Due to Corrosion and/or Water Intrusion
Models:
1996-2002 Chevrolet Express
1996-2002 GMC Savana
with Gas Engine
Supercede:
This bulletin is being revised to update the service procedure for 1996-1999 vehicles and change warranty information. Please discard Corporate Bulletin
Number 02-06-04-020A (Section 06 - Engine/Propulsion System).
This bulletin is being issued to inform dealers that the VCM/PCM for the above listed vehicles may be susceptible to corrosion due to its mounting
location under the hood near the left front fender. Any time the VCM/PCM is replaced due to corrosion, the engine wiring harness deflector should be
replaced with a new redesigned deflector. This new deflector will more effectively channel windshield run-off water away from the VCM/PCM. Also, a
road splash shield should be installed onto the VCM/PCM bracket to provide additional protection to the VCM/PCM. Use the appropriate procedure
listed below.
For 1996-1999 Vehicles:
Install the new engine wiring harness deflector, P/N 15091839, road splash shield, P/N 15183966, and 2000 model year designed VCM/PCM
bracket, P/N 15766026, since the road splash shield will not fit on the older design bracket.
1.
Open the hood.
2.
Remove the engine wiring harness deflector from the left front fender and discard.
3.
Install the new engine wiring harness deflector. The new deflector attaches using only the front clip.
4.
Remove the air cleaner assembly.
5.
Disconnect the negative battery cable.
6.
Remove the spring retainers off the edges of the VCM/PCM.
7.
Slide the VCM/PCM out of the bracket.
8.
Disconnect the VCM/PCM harness connectors.
9.
Remove the nuts and the VCM/PCM mounting bracket.
Important:
Before the new VCM/PCM bracket can be installed, the VCM/PCM fastening bail/latch must be relocated. Drill out casting dimples
approximately 25 mm (1 in) above current holes using 4.76 mm (0.1875 in) drill bit and move bail/latch to new location.
10.
Install the new 2000 model year designed VCM/PCM bracket, P/N 15766026, and nuts.
