Free API
Help
1999 GMC SUBURBAN
6.5L V8 Diesel•4WD•diesel•turbo
2 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor519Torque135Fluid10DTC1612Battery1Maintenance0Recalls2
P1500high severityPowertrain

Starter Signal Circuit

on 1999 GMC Suburban 6.5L V8 Diesel · 4WD

What this code means

The starter signal circuit is reading a fault to the control module. This can affect engine cranking and starting.

Symptoms

  • No-start condition
  • Intermittent cranking
  • Check engine light on

Common causes

  • Faulty starter relay
  • Damaged starter signal wiring
  • Bad ignition switch
  • Poor ground connection

Diagnostic steps

  1. Scan for stored codes
  2. Check starter signal at control module
  3. Test starter relay operation
  4. Inspect wiring and connectors
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Powertrain codes on this vehicle

For shop owners
Diagnosing for customers?
Text them the estimate with photos and get approval in minutes with Auto Shop Base.
Talk to the ownerSee what's included
Built by a shop owner. Talk to Chris, not a sales rep.
🔌 Need this data in your app? It's all in the free API →
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 1999 GMC Suburban 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 GMC Suburban — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
A free website, SEO and Google reviews with your shop software. Auto Shop Base Professional, $250/mo, with our labor times on every estimate.
See what's included →