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1991 GMC G1500 Rally 5.7L Code 4
Posted to GM Brakes on 9/19/2001 3 Replies

This van has recently set code 4 on the ABS (3 short & 1 long flash). It flashes the code WHENEVER the key is on, and also when the ALDL connector is jumped. My resources say code 4 is a grounded antilock valve switch circuit. If that is the blue wire to the v...

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  Related Documents & Media  1991 GMC G1500 Rally

 
Message Closed w/FIX

car Vehicle Data

1991 GMC G1500 Rally

VIN 1GKEG25K4M
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI
AffectedCode 4
Misc.Rwal
Message Closed w/FIX

car Vehicle Data

1991 GMC G1500 Rally

VIN 1GKEG25K4M
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI
AffectedCode 4
Misc.Rwal