P1500moderate severityPowertrain

Starter Signal Circuit

on 2010 Toyota 4Runner 4.0L V6 · 4WD

What this code means

The ECM is not receiving the proper signal from the starter motor circuit.

Symptoms

  • CEL
  • Extended cranking
  • Rough startup
  • Poor cold start

Common causes

  • Faulty starter relay
  • Damaged wiring
  • Poor ground
  • Faulty ignition switch

Diagnostic steps

  1. Test starter signal wire
  2. Check relay operation
  3. Inspect wiring
  4. Test ignition switch

Repair notes

Repair starter signal circuit.

Other Powertrain codes on this vehicle

🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
⚠ STILL BEHIND THE PAYWALL
The 2010 Toyota 4Runner repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Toyota 4Runner — $99 →
Building an app?
Free API access to all this data — 50 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →