OBD CodesWhat it means
On many cars the engine computer switches the starter motor through a relay. These codes mean the computer sees an electrical fault in that relay circuit.
Codes in this group
| Code | Meaning |
|---|---|
| P0615 | Starter relay circuit fault |
| P0616 | Starter relay circuit signal low |
| P0617 | Starter relay circuit signal high |
Bank 1 is the side of the engine that has cylinder 1. Sensor 1 is before the catalytic converter and sensor 2 is after it. More terms explained.
What you may notice
- Engine does not crank when the key or button is used
- Starts sometimes and not others
- A single click and nothing more
Common causes
Most likely first:
- A failed starter relay
- A weak battery or poor terminals
- A faulty clutch or gear position switch stopping the start signal
- Wiring fault
What to check first
- Check the battery first
- On an automatic, try starting in Neutral as well as Park
- On a manual, press the clutch fully
Have a mechanic confirm. A fault code tells you which system reported a problem, not which part has failed. The same code can have several causes, and they differ between car models. Use this page to understand the code, then have a qualified mechanic test the car before any part is replaced.
After the repair
Once the cause is fixed, the code can be cleared with a scan tool, or the warning light goes out by itself after several trips without the fault. Clearing a code without fixing the cause only hides it for a while. More about clearing codes.
Related codes
Engine overheating or overspeed (P0217), Fuel level sensor (P0460), Radiator cooling fan circuit (P0480), Vehicle speed sensor (P0500), Idle speed control (P0505), Brake pedal switch (P0504), Engine oil pressure sensor (P0520), Air conditioning pressure sensor (P0530). All codes.
Written in November 2026. These are generic OBD-II codes, the same on all makes. Causes and repair steps differ between models.