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Home / Codes / P0615
DTC code page

P0615: Starter Relay Circuit

Quick answer: The PCM detected a fault in the starter relay control or monitoring circuit.

Drivers also search this fault as starter relay circuit fault, starter control relay code, starter relay malfunction.

Severity: high Family: powertrain Related paths: 12
Meaning

What P0615 usually means

P0615 sits in the engine-start authorization path, not in the fuel or spark side after the engine is already running. On most vehicles it means the module is unhappy with the relay circuit that commands starter engagement or verifies that command happened correctly. In real diagnosis that pushes attention toward the relay, ignition-switch start request, park-neutral input, fuse-box terminals, and wiring around the starter control side before you start guessing about sensors.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Clarify whether the complaint is truly no-crank, intermittent crank, or crank-without-start because P0615 belongs on the starter-command side.
  • Check the starter relay, related fuses, and obvious fuse-box heat damage before assuming a PCM issue.
  • Notice whether moving the shifter or retrying the key changes behavior, since that often points toward authorization inputs instead of the relay itself.
Driving risk

Can you keep driving?

P0615 can leave the vehicle unable to crank at all or only starting unpredictably. If the fault is active, do not rely on the vehicle until the starter-control path is proven stable.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Symptoms

Common symptoms

Likely causes

Common causes behind this code

  • Failed starter relay or high-resistance relay contacts
  • Open or short in the starter relay control circuit
  • Ignition-switch start request not reaching the relay consistently
  • Park-neutral or clutch-start input preventing normal starter authorization
  • Fuse-box, ground, or connector damage in the starter command path

Cause phrases often tied to this code: starter relay, ignition switch, park neutral switch, fuse box, start request circuit.

Diagnostic order

Suggested workflow

  1. Confirm whether the relay receives a proper start request when the key is turned to crank.
  2. Check related fuses, relay socket tension, and voltage drop on both the control and load sides.
  3. Verify park-neutral or clutch switch status so the starter is not being blocked by an input fault.
  4. Inspect the starter control wire path for corrosion, rub-through, or poor previous repairs.
  5. If the circuit proves healthy, test the relay and downstream starter-control response directly.
Avoid guesswork

Common mistakes

  • Calling every P0615 a bad starter motor when the code is usually about the command side.
  • Skipping park-neutral, clutch, or ignition-switch checks because the relay is easier to replace.
  • Confusing no-crank and crank-no-start complaints and chasing the wrong system entirely.
Repair path

Practical fix guidance

  • Repair the verified starter relay, control wire, fuse-box connection, or authorization input fault first.
  • If the relay socket shows heat damage or loose terminals, fix that root cause instead of plugging in another relay and hoping.
  • After repair, confirm normal starter engagement across repeated cold and hot start attempts.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0615

Useful when the driver knows the wording but not the exact DTC yet.

  • starter relay circuit fault
  • starter control relay code
  • starter relay malfunction
Related search intent

Queries this page can answer naturally

  • P0615 code meaning
  • what does P0615 mean
  • starter relay circuit symptoms
  • starter relay control fault
FAQ

Quick questions about P0615

Does P0615 mean the starter itself is bad?

Not automatically. It points first to the relay circuit and start-command path, not automatically to a failed starter motor.

Can a bad park-neutral switch trigger P0615?

Yes. If the control module never sees valid starter authorization, the relay circuit can set a related fault story.

Why does jiggling the shifter sometimes change the symptom?

Because borderline park-neutral or start-authorization inputs can allow or block starter command intermittently.