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 MANUALSCHEVROLET1999SUBURBAN C2500, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1537-U1193DTC P1637DTC P1637: GENERATOR LIGHT CIRCUIT FAULT (3.4L "U" SERIES)DIAGNOSTIC AIDS
1999 Chevrolet Suburban C2500, 6.5 F
Diagnostic Aids
1999 Chevrolet Suburban C2500, 6.5 FSECTION Diagnostic Aids
Check for poor connection at PCM. Inspect harness connectors for backed-out terminals, improper mating, broken locks or poor terminal-to-wire connection.
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.