P0616: Starter Relay Circuit Low (Meaning, Causes, Fixes)
What P0616 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 solenoid, starter relay and safety devices such as the clutch position sensor or neutral safety switch, and that the PCM sets P0616 when it detects a low voltage condition in this circuit. Related codes are P0615 (general circuit malfunction) and P0617 (circuit high). RepairPal titles the code 'Starter Relay Circuit Low' but describes it more generally: 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 Subaru, Hyundai, Kia, Honda, Ford, Suzuki and Can-Am, so check technical service bulletins (TSBs) for your vehicle.
Severity: can I keep driving?
Stop and fix promptly
Get it checked soon. RepairPal rates P0616 '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 or start (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 P0615 or P0617 that point to a general 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. A low circuit voltage can start at a weak battery or a corroded cable.
- 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 P0616. 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
- Flash 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 battery should read about 12 volts and 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; resistance or no continuity means an open or shorted wire.
- 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 and detail: RepairPal rates P0616 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 specifically ties P0616 to low voltage in the circuit, while RepairPal's description only says the circuit isn't operating properly (the same wording it uses for P0615). 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 P0616?
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 P0616 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, P0616 is set when the PCM sees low voltage in the circuit, and P0617 is the circuit high code.
Can a weak battery cause P0616?
OBD-Codes.com lists corroded or damaged battery cables among the causes and says the battery should read about 12 volts during testing, so check the battery and its cables first. Neither source lists the battery itself as a cause.
Sources
Last reviewed 2026-10-26. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.