Code Definition

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

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

About P1908

P1908 is a manufacturer-specific powertrain diagnostic trouble code recorded for Audi 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

DTC P1908 is set when the engine management system detects that data held in Engine Control Module 1 and Engine Control Module 2 does not agree. Some Audi models, particularly large multi cylinder engines such as W12 layouts, use two engine control modules that share the workload and must keep key operating parameters, adaptations, and immobiliser or coding data synchronised with each other. When the two modules report values that do not match within an allowed tolerance, the system flags this correlation fault. Because the modules no longer fully trust each other, the engine may drop into a r...

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