Code Definition

P1613 — MIL Request Signal Circuit High Input

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

About P1613

P1613 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1613 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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.

P1613 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

On this system a control module communicates a malfunction indicator lamp (MIL) request across a dedicated MIL request signal circuit, and the Engine Control Module (ECM) monitors the voltage on that line. DTC P1613 sets when the ECM sees the MIL request signal voltage higher than the expected range, which is a circuit high input fault. A high reading is typically caused by the signal wire being shorted to a voltage source, or by an open circuit that lets an internal pull up hold the input high. Because the fault lies in the request circuit rather than the engine itself, the usual result is an...

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