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 MANUALSCHEVROLET1996CHEVY VAN G30, VAN CARGO EXTENDED, 6.5 YREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 4.3LTROUBLE CODE CHARTSCODE 86, LOW GEAR RATIO ERROR - ALL MODELSNOTES
1996 Chevrolet Chevy Van G30, Van Cargo Extended, 6.5 Y
Code 86, Low Gear Ratio Error - All Models: Notes
1996 Chevrolet Chevy Van G30, Van Cargo Extended, 6.5 YSECTION Notes
Control module calculates ratio based on transmission input speed and output speed sensor readings. Control module compares known ratio to calculated ratio.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- An out-of-calibration transmission range pressure switch could falsely indicate actual transmission range.
- This test verifies proper ratio.
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.