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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 15 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 5.7L)MISCELLANEOUS PCM/VCM CONTROLSTRANSMISSIONSHIFT LIGHT (MANUAL TRANSMISSION)
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Shift Light (Manual Transmission)
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Shift Light (Manual Transmission)
WARNING: This page is about a different variant/trim than selected.
- If powertrain OBD system check has been performed, go to next step. If powertrain OBD system check has not been performed, perform powertrain OBD system check. See POWERTRAIN OBD SYSTEM CHECK in TESTS W/CODES - 5.7L article.
- Turn ignition switch to LOCK position. Connect scan tool to data link connector. Turn ignition switch to RUN position. Using scan tool, command shift light on. If shift light does not illuminate, go to next step. If shift light illuminates, go to step 4).
- Turn ignition switch to LOCK position. Disconnect PCM harness connector that contains shift light circuit. Turn ignition switch to RUN position. Using a fused jumper wire, ground shift light control circuit (Tan/Black wire) at PCM harness connector. If shift light illuminates when grounded, go to step 5). If shift light does not illuminate, go to step 6).
- Using scan tool, command shift light off then on. If shift light operates as expected, system is okay at this time. If shift light does not operate as expected, go to step 8).
- Check for poor connection at PCM. If poor connection exists, go to step 7). If poor connection does not exist, go to step 10).
- Repair open in shift light control circuit and go to step 11).
- Repair poor connection as necessary and go to step 11).
- Turn ignition switch to LOCK position. Disconnect PCM harness connector that contains shift light circuit. Turn ignition switch to RUN position. If shift light illuminates, go to next step. If shift light does not illuminate, go to step 10).
- Repair short to ground in shift light control circuit (Tan/Black wire) between PCM and instrument cluster. After repair is complete, go to step 11).
- Replace PCM. Program PCM, perform VTD password relearn procedure and perform crankshaft variation learn procedure. See COMPUTER RELEARN PROCEDURES in GENERAL INFORMATION article. After repair is complete, go to next step.
- Start engine and let idle until normal operating temperature is obtained. Select DTC FAILED THIS IGNITION on scan tool. If DTCs do not exist, system is okay at this time. If DTCs exist, perform appropriate DTC test. See TESTS W/CODES - 5.7L article.
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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.