Code Definition

P1908 — Data in Engine Control Modules 1 & 2 does not match

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Volkswagen

About P1908

P1908 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1908 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This fault code is set when the engine control module (ECM) detects a mismatch in the data exchanged between ECM 1 and ECM 2. Many Audi vehicles, especially those with high-performance or dual-engine configurations, use a redundant or split control system where two ECMs must synchronize operational parameters. A data mismatch can cause performance issues, fail-safe mode activation, or drivability concerns.

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