P0615 Starter Relay Circuit

P0615 indicates a starter relay circuit problem. The controller has detected an electrical fault in the command or feedback path used to operate the starter relay.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the starter motor before testing the starter relay control circuit and start authorization inputs.

Symptoms of P0615

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0615

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Check start request status, starter relay command, relay coil voltage, relay output, park or neutral input, immobilizer status, and freeze-frame data.
Inspect relay contacts, fuse feed, control wiring, ground path, ignition switch or start button input, neutral safety inputs, and connector corrosion.
Command or test the relay circuit and verify whether the starter solenoid receives power only when requested.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.