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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 6.5L DIESEL (G SERIES)DIAGNOSTIC TROUBLE CODESDTC P0263 - CYLINDER NO. 1 BALANCE SYSTEMCIRCUIT DESCRIPTION
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
Circuit Description
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Circuit Description
PCM has ability to increase and decrease amount of fuel to each cylinder to provide smooth idle operation. DTC will set if fuel correction amount exceeds defined limits.
DTC will set when the following conditions are present:
- Engine at idle.
- Engine coolant at normal temperatures.
- Cylinder fault must be constant.
- Fuel correction amount exceeds limits (internal to PCM).
- Conditions are met for 2 seconds.
RENDER: 1.0x
NO RELATED
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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.