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.
Pcm Coding (All Models)
If Powertrain Control Module (PCM) is replaced it is necessary to code new PCM. If new PCM is not properly coded, the following problems may occur:
- Driveability problems (i.e. harsh shifting).
- Increased fuel consumption.
- Increased exhaust emissions.
- Reduction in transmission life.
- Malfunctions not present are stored in PCM memory.
- Not all PCM functions are carried out (i.e. EVAP system operation).
Following manufacturer's instructions, connect VAG 1551 scan tool to vehicle. Following manufacturer's instructions, access PCM coding information using VAG 1551 scan tool. For PCM coding options, see appropriate ECM CODING OPTIONS table.
As an example, a properly coded PCM for an A4 model with EGR system, All Wheel Drive (AWD), and Automatic Transmission (A/T) would look like 01251 on the VAG 1551 scan tool.
| Application/Code | Option | |
|---|---|---|
| Country/Emissions | ||
| 06 | USA Equipped EVAP Leak Detection Pump | |
| Drivetrain/Auxiliary Function | ||
| 0 | Front Wheel Drive Without Traction Control | |
| 1 | Front Wheel Drive With Traction Control | |
| 2 | All Wheel Drive Without Traction Control | |
| 3 | All Wheel Drive With Traction Control | |
| Transmission | ||
| 0 | 5-Speed Manual Transmission | |
| 5 | Automatic Transmission 01V | |
| Vehicle Type | ||
| 1 | A4 | |
| Application/Code | Option | |
|---|---|---|
| Country/Emissions | ||
| 01 | Vehicle With EGR | |
| Drivetrain/Auxiliary Function | ||
| 0 | Front Wheel Drive Without Traction Control | |
| 1 | Front Wheel Drive With Traction Control | |
| 2 | All Wheel Drive Without Traction Control | |
| Transmission | ||
| 0 | 5-Speed Manual Transmission | |
| 5 | Automatic Transmission 01V | |
| Vehicle Type | ||
| 1 | A4 | |
| Application/Code | Option | |
|---|---|---|
| Country/Emissions | ||
| 06 | USA Equipped EVAP Leak Detection Pump | |
| Drivetrain/Auxiliary Function | ||
| 0 | Front Wheel Drive Without Traction Control | |
| 1 | Front Wheel Drive With Traction Control | |
| 2 | All Wheel Drive Without Traction Control | |
| 3 | All Wheel Drive With Traction Control | |
| Transmission | ||
| 0 | 5-Speed Manual Transmission | |
| 5 | Automatic Transmission 01V | |
| Vehicle Type | ||
| 2 | A6 | |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.