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GMC
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1999
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C3500 HD 6.5 F, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls Tests W/Codes - Diesel
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Diagnostic Tests
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DTC P0225: Accelerator Pedal Position (App) Sensor 3 Circuit ("C", "G", "K" & "P" Series)
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Diagnostic Aids
Diagnostic Aids
All 5-volt reference circuits must be checked for proper reference voltage.