Code Definition

P15ED — Integrated Supply Module (ISM) or Terminal 15 Power Supply Fault

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

About P15ED

P15ED is a manufacturer-specific powertrain diagnostic trouble code recorded for BMW 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.

P15ED 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 Digital Motor Electronics (DME) monitors the Terminal 15 ignition switched power supply and the Integrated Supply Module (ISM) output to confirm correct voltage presence and switching behaviour when the ignition is in the ON or START position. DTC P15ED is set when the DME detects missing, unstable, or implausible voltage on the Terminal 15 circuit or the corresponding ISM controlled supply outside the specified operating range for a calibrated period. The Terminal 15 input is the primary wake up signal from the ignition lock or CAS, FEM, or BDC module on BMW platforms, and the ISM uses th...

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