Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1993 GMC Forward Control 6.2 J, AutomaticFACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location | ||
|---|---|---|---|
| ABS Module | |||
| Rear Wheel ABS | On left side of engine compartment. | ||
| 4-Wheel ABS | Under right side of vehicle, on frame rail. | ||
| Audio Alarm Module | Behind dash, below fuse block. | ||
| Brake Booster Delay Module ("P" Series) | Behind left side of dash, on parking brake support bracket. | ||
| Coolant Level Indicator Module | Behind left side of dash. | ||
| Cruise Control Module | On top of rear parking brake bracket. | ||
| Daytime Running Lights (DRL) Module | Behind left side of dash, above steering column. | ||
| Diode Array Module | Behind left side of dash, in dash harness. | ||
| Electronic Delay Module | Behind left side of dash. | ||
| Glow Plug Controller | |||
| "G" Series | On left side of engine. | ||
| "P" Series | On top rear of engine. | ||
| Hot Fuel Handling Module | |||
| "G" Series 5.0L (VIN H) & 5.7L (VIN K) | Under driver's seat. See Figure. | ||
| "G" Series 7.4L (VIN N) | Under driver's seat. See Figure. | ||
| "G" Series 5.7L (VIN K) | On left "B" pillar. See Figure. | ||
| "G" Series 7.4L (VIN N) | On left "B" pillar. See Figure. | ||
| "P" Series 4.3L (VIN Z - A/T) | Behind left side of shipping panel. See Figure. | ||
| "P" Series 4.3L (VIN Z - M/T) | Behind left side of shipping panel. See Figure. | ||
| "P" Series 7.4L (VIN N) | Behind left side of shipping panel. See Figure. | ||
| Keyless Entry Module | Behind right side of dash. | ||
| Knock Sensor Module | |||
| "P" Series 4.3L (VIN Z - M/T) | On top right of engine, on valve cover. See Figure. | ||
| "P" Series 5.7L (VIN K - M/T) | On top right of engine, on valve cover. See Figure. | ||
| Power Door Lock Delay Module | Behind dash, to right of steering column. | ||
| Powertrain Control Module (PCM) | |||
| "G" Series 4.3L (VIN Z) | Under driver's seat. See Figure. | ||
| "G" Series 5.0L (VIN H) & 5.7L (VIN K) | Under driver's seat. See Figure. | ||
| "G" Series 7.4L (VIN N) | Under driver's seat. See Figure. | ||
| "G" & "P" Series 6.2L (Diesel) | Under driver's seat. See Figure. | ||
| "G" Series 5.7L (VIN K) | On left "B" Pillar. | ||
| "G" Series 7.4L (VIN N) | On left "B" Pillar. | ||
| Diesel "G" & "P" Series 6.2L | Under driver's seat. See Figure. | ||
| Gas | |||
| "P" Series 4.3L (VIN Z - A/T) | Behind left side of shipping panel. See Figure. | ||
| "P" Series 4.3L (VIN Z - M/T) | Behind left side of shipping panel. See Figure. | ||
| "P" Series 5.7L (VIN K - A/T) | Behind left side of shipping panel. See Figure. | ||
| "P" Series 5.7L (VIN K - M/T) | Behind left side of shipping panel. See Figure. | ||
| "P" Series 7.4L (VIN N) | Behind left side of shipping panel. See Figure. | ||
| Transmission Control Module | |||
| "G" Series | Under driver's seat. | ||
| "P" Series | Behind left side of shipping panel. | ||
| Windshield Wiper Motor Module | Behind center of dash, on firewall. | ||
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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