P0615: Starter Relay Circuit (Meaning, Causes, Fixes)
What P0615 means
The starter relay lets battery power reach the starter when the ignition is in the start position. OBD-Codes.com explains that the circuit starts at the battery and runs through the ignition switch, fuses, starter relay, starter solenoid and safety devices such as the clutch position sensor or neutral safety switch. When the PCM detects a general malfunction in this circuit it sets P0615; related codes P0616 (circuit low) and P0617 (circuit high) cover more specific faults. RepairPal describes it the same way: the PCM sees that the starter circuit isn't operating properly, and the engine won't crank. The code is generic to OBD-II vehicles (1996 and newer); OBD-Codes.com names Cadillac, Nissan, Chevrolet, Buick, Honda, Acura, Infiniti, Peugeot, Toyota, GMC, Mazda, Ford and Subaru among the makes that use it, and search interest shows people looking it up for Chevy Malibu and Silverado, Nissan, Infiniti and Acura, so check technical service bulletins (TSBs) for your vehicle.
Severity: can I keep driving?
Stop and fix promptly
Get it checked soon. RepairPal rates P0615 'Urgent', meaning immediate action is needed. OBD-Codes.com says the severity varies a lot: some cars just show a check engine light and still start and run, while others won't start at all. Either way, a car with this code may leave you stranded, so don't rely on it for important trips until it's fixed.
Common symptoms
- Engine won't crank (both sources)
- Sporadic no-crank, where it fails to crank only some of the time (OBD-Codes.com)
- Check engine light on, sometimes with the car still starting and running normally (OBD-Codes.com)
Likely causes
Roughly most to least common, based on the sources below. Your vehicle may differ.
- A failed starter relay (both sources)
- A failed starter, or a faulty starter solenoid (both sources list the starter; OBD-Codes.com adds the solenoid)
- Damaged or faulty wiring (both sources)
- A faulty ignition switch (OBD-Codes.com)
- A blown fuse or fusible link (OBD-Codes.com)
- Corroded or damaged connectors or battery cables (OBD-Codes.com)
- A failed PCM (both sources)
Diagnostic steps you can do
Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.
- Read all stored codes and write them down, including any P0616 or P0617, which point to a low or high circuit fault.
- Make sure the battery is charged (about 12 volts) and that the battery terminals and cables are clean, tight and undamaged.
- Check the fuse (and fusible link, if fitted) for the starter relay circuit using your vehicle's fuse chart.
- Inspect the wiring and connectors between the battery, ignition switch, PCM, starter relay, starter solenoid and starter for rubbing, bare wires, burn spots, corrosion or bent pins.
- Look up TSBs for your year, make, model and engine that mention P0615. OBD-Codes.com says this can save a lot of time.
Typical fixes
- Replace a blown fuse or fusible link
- Clean corroded connectors and repair or replace battery cables or terminals
- Repair or replace damaged wiring
- Replace the starter relay
- Replace the ignition switch
- Replace the starter solenoid or starter
- Reflash or replace the PCM (only after the rest of the circuit checks out)
Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.
🛠 When to call a pro
- OBD-Codes.com's voltage check: the starter should have battery voltage with the key in the start position. Voltage present with the starter not engaging points to a defective starter or solenoid; no voltage points to the ignition switch or wiring. Continuity tests should be done with power removed, and wiring should normally read 0 ohms unless the service data says otherwise.
- OBD-Codes.com says a common mistake is replacing the starter or PCM when damaged wiring or another component is the real problem.
- The sources differ on severity: RepairPal rates P0615 Urgent and says the engine will not crank, while OBD-Codes.com says it ranges from just a check engine light on a car that still starts and runs to a car that won't start at all. OBD-Codes.com also lists more causes (ignition switch, solenoid, fuses, connectors and battery cables) than RepairPal's four (PCM, starter, starter relay, wiring).
Where to buy
Plain search links. Always match parts to your exact year, make, model and engine.
FAQs
Can I drive with P0615?
If the car starts, you can usually drive it, but it may not start next time. RepairPal rates the code 'Urgent', and OBD-Codes.com says it can range from a car that runs normally to one that won't start at all, so get it checked before you get stranded.
Does P0615 mean I need a new starter?
Not necessarily. Both sources list the starter relay and wiring as causes alongside the starter, and OBD-Codes.com warns that replacing the starter or PCM when wiring or another part is at fault is a common mistake.
What's the difference between P0615, P0616 and P0617?
OBD-Codes.com says all three relate to the starter relay circuit: P0615 is a general circuit malfunction, while P0616 and P0617 are for circuit low and circuit high faults.
Where is the starter relay?
It varies by vehicle. It's often in a fuse and relay box, but check your owner's manual or service information for your exact model.
Sources
Last reviewed 2026-10-26. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.