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 MANUALSHYUNDAI1991SONATA V6-3.0LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINTRANSMISSION CONTROL SYSTEMSTECHNICAL SERVICE BULLETINS
1991 Hyundai Sonata V6-3.0L
Transmission Control Systems: Technical Service Bulletins
1991 Hyundai Sonata V6-3.0LSECTION Technical Service Bulletins
- Customer Interest
- By Symptom
- All Technical Service Bulletins
- A/T - Tester Sets Diagnostic Trouble Codes
- Scan Tool - Software Update Procedure
- TCU - Fault Code Erasure
- A/T - Will Not Engage Overdrive
- A/T - Reverse To Drive Engagement Shock
- A/T - Harsh Engagement Shock
- TCM - Adaptive Control
- Pulse Generator - Supplier Change
- A/T - Driveability Concerns/DTC's Set/MIL ON
- A/T - Intermittent Delayed, Erratic, Harsh Shifting
- A/T - Delayed/Harsh/Erratic Upshifts/Downshifts
- A/T - Poor 1st to 2nd Gear Upshift/Harsh Shifts
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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.