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 MANUALSAUDI1999A6 QUATTROREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSSHIFT INTERLOCK SYSTEMSTROUBLE SHOOTINGFUNCTIONAL CHECK
1999 Audi A6 Quattro
Functional Check
1999 Audi A6 QuattroSECTION Functional Check
NOTE:
If battery is disconnected or discharged, gear selector can be moved out of Park by turning ignition key to START position. Shift lock relay will not lock gear selector when vehicle speed is greater than 3 MPH.
- With ignition key removed, ensure gear selector cannot be moved from Park. Insert key in ignition switch. Turn ignition switch on. Ensure gear selector can only be moved with brake pedal pressed down. Move gear selector to Neutral position. Without pressing brake pedal, ensure gear selector cannot move out of Neutral. Press brake pedal down. Ensure it is now possible to move gear selector. If shift lock system does not operate as described, adjust gear selector, solenoid and control cable.
- If shift lock system does not operate after adjustments are made, check electrical system of shift lock system with Tester (VAG 1551/1). See testing information in appropriate VOLKSWAGEN/AUDI V.A.G. ELECTRONIC CONTROLS article. If any problems are found, service harness or components. If no problems are found, TCM may be defective. If shift lock system still does not operate correctly, check for worn or damaged parts and replace as necessary.
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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.