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 MANUALSAUDI2004A6 QUATTRO SEDAN (4B2) V8-4.2L (AWN)REPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINCONTINUOUSLY VARIABLE TRANSMISSION/TRANSAXLECONTROL MODULETESTING AND INSPECTION
2004 Audi A6 Quattro Sedan (4B2) V8-4.2L (AWN)
Control Module: Testing and Inspection
2004 Audi A6 Quattro Sedan (4B2) V8-4.2L (AWN)SECTION Testing and Inspection
Transmission Control Module (TCM), coding
The Transmission Control Module (TCM) can be coded.
Note: Coding can only be performed with the ignition ON and with the selector lever in position "P" or "N." The accelerator pedal must be in the idle position. The vehicle must be stationary and the engine must not be started.
Test procedure
^ Connect VAS 5051 Vehicle Diagnosis, Measurement and Information System and select vehicle system "02 Transmission Electronics". Ignition must be switched on.
Display on VAS 5051
^ Touch -1- diagnostic function "07 Coding control module".
Display on VAS 5051:
^ 1 - Enter code word
^ On keypad -2- enter control module code as given in code chart
^ Confirm entry by pressing Q button.
Coding chart
Note: After coding, the Transmission Control Module DTC memory is a automatically deleted.
Display on VAS 5051:
^ 1 - Coding is being carried out
^ Wait until next display appears on screen.
Display on VAS 5051:
^ 1 - Coding in the vehicle system completed
^ 2 - Control module identification number with new coding (previous coding in parentheses)
^ Terminate function "07 Coding Control Module" by pressing 4 button.
^ Perform adaptation.
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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.