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.
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HOMESERVICE MANUALSCHEVROLET1999PICKUP C2500, 2D PICKUP, 6.5 F, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 239 (ENGINE CONTROLS - TROUBLE SHOOTING - NO CODES - 3.4L)INTERMITTENTSINTERMITTENT CONDITIONSCONTROL MODULE/COMPONENT POWER & GROUNDS
1999 Chevrolet Pickup C2500, 2D Pickup, 6.5 F, Standard
Control Module/Component Power & Grounds
1999 Chevrolet Pickup C2500, 2D Pickup, 6.5 F, StandardSECTION Control Module/Component Power & Grounds
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Poor power or ground connections can cause widely varying symptoms.
- Check all Powertrain Control Module (PCM) power circuits. Many vehicles have multiple circuits supplying power to the PCM. Other components in the system may have separate power circuits that may also need to be tested. Inspect connections at the module/component connectors, fuses, and any intermediate connections between the power source and the module/component. A test light or a DMM may indicate that voltage is present, but neither tests a circuit ability to carry sufficient current. Ensure that the circuit can carry the current necessary to operate the component.
- Check all control module ground and system ground circuits. The PCM may have multiple ground circuits. Other components in the system may have separate grounds that may also need to be tested. Inspect grounds for clean and tight connections at the grounding point. Inspect the connections at the component and in splice packs, where applicable. Ensure that the circuit can carry the current necessary to operate the component.
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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.