AL551

Bosch/ZF AL551 (8HP55) is a 8 speed tiptronic Transmission Control Unit mounted in:

• Audi: A4, A6, A7, A8, Q5

Technical details

Available services

AL551 transfer

Allows complete transfer of IMMO data between different TCU families and TCU models. Commonly used during transmission conversions or swaps where the replacement TCU differs from the original unit.

AL551 to TCU

Transfer from AL551 to another TCU.

Order transfer to TCU

AL551 synchronization

Synchronizes the TCU with the vehicle’s immo master module to restore proper immo operation. Required after TCU replacement, module mismatch or when restoring immo pairing.

AL551 with BCM2

Synchronizes AL551 with the BCM2.

Order BCM2 synchronization

Part numbers

All AL551 part numbers are supported for transfer and synchronization services. The list below shows the most common variants:

Notes

• 🔧 Full bench/boot read is required.
• ⚠️ Virtual/partial reads are not supported.
• ✅ Full checksum correction is included.

Related ECUs

• AL951
• DL382
• DL501
• VL381