Code Definition

P1911 — Controller Area Network data bus fault

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

About P1911

P1911 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.

P1911 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 P1911 indicates that the engine control system has detected a fault on the Controller Area Network (CAN) data bus, the twisted pair network that lets the control modules share information. Modules such as the ECM, transmission control module (TCM), ABS, instrument cluster, and gateway all rely on this bus, and the code sets when messages are lost or corrupted or the bus voltages leave their normal range. As with related CAN faults, the trouble usually lies in the physical bus, a wiring or connector fault, a bad terminating resistor, or a module that is disturbing the network, rather than i...

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