Code Definition

P1345 — Ignition Coil Output Stage 3 Short To Ground

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

About P1345

P1345 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 P1345 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.

P1345 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

Ignition coils on these Audi and Volkswagen engines are switched by an output stage, either integrated into the coil body or housed in a separate ignition power module, with the Engine Control Module supplying a low current trigger signal to control dwell and spark timing. The module supervises the state of its own trigger output, so it can identify when that line is being pulled low by something other than its own driver. DTC P1345 is stored when the ECM detects the ignition coil output stage 3 trigger circuit shorted to ground. With the trigger permanently earthed the module has no authority...

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