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.
Powertrain Control Module (Pcm)
The Powertrain Control Module (PCM) has memory storage and a permanent diagnostic trouble code memory. For PCM application, see PCM APPLICATION table.
| Model | PCM No. | ||||
|---|---|---|---|---|---|
| A4 | (2) 8D0 906 266 A | ||||
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New PCM must be coded with the Volkswagen Audi Group (VAG) 1551 scan tool when installed in vehicle. See TESTS W/CODES article for PCM coding information.
The PCM receives input signals from various engine sensors. These input signals are used to control idle speed, fuel delivery and ignition timing to maintain optimum performance, fuel economy and emission standards.
Use the Manual With the Right Hardware
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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.
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