Code Definition

P1218 — Injector Circuit Cylinder 6 Short to B+

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

About P1218

P1218 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.

When P1218 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

P1218 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

The cylinder 6 fuel injector receives battery voltage through the fuel pump relay or an injector fuse, and the Engine Control Module completes the circuit by switching the low side to ground for the calculated pulse width. Between injection events the control wire sits near battery voltage through the injector winding, and during an event it should be pulled close to ground, allowing the module to detect a fault by comparing the commanded state with the actual state of the line. DTC P1218 is stored when the ECM finds the cylinder 6 injector control circuit remaining at battery voltage when it ...

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