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.
1996 GMC Forward Control 6.5 Y, StandardFACTORY OEM SERVICE PROCEDURE
Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
- Install scan tool. Check if any other DTCs are set. If other DTCs are not set, go to next step. If other DTCs are set, go to that DTC test.
- Check if DTC P0507 is active this ignition cycle. If DTC P0507 is active this ignition cycle, go to step 5). If DTC P0507 is not active this ignition cycle, go to next step.
- DTC is intermittent. See DIAGNOSTIC AIDS.
- Problem is engine mechanical related. Repair as necessary and go to step 7).
- Using scan tool, clear codes. Start engine. Idle at operating temperature. Select SPECIFIC DTC for DTC P0507. Operate vehicle under conditions which originally set DTC. If scan tool indicates DTC test has run and passed, go to next step. if not, go to step 2).
- Using scan tool, select CAPTURE INFO function. Review stored info. If other DTCs are stored, go to applicable DTC. If not, system is okay.
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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