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Home / DTC / P1170 — ESO Engine Shut Off Solenoid Fault

P1170 — ESO Engine Shut Off Solenoid Fault

Detailed page for trouble code P1170.

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Code

P1170

LINCOLN P — Powertrain

ESO Engine Shut Off Solenoid Fault

Brand: LINCOLN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted ESO wiring or connector
  • Corroded/loose ESO connector or poor pin contact
  • Failed or stuck ESO solenoid (mechanical or electrical)
  • Blown fuse or faulty relay supplying ESO circuit
  • Poor ground at ESO or PCM ground connection
  • PCM driver fault or internal module failure

Symptoms

  • Engine may not start or will crank but not run (if ESO prevents fuel delivery)
  • Intermittent no‑start or stalling
  • MIL (Malfunction Indicator Lamp) illuminated and P1170 stored
  • Possible inability to shut engine off via key in some systems (depending on design)
  • Crank/no‑start with no fuel pressure (on diesel systems with fuel cut solenoid)

What to check

  • Read and record freeze‑frame and live data with a scan tool
  • Check for other stored codes that might point to fuel or PCM issues
  • Visually inspect ESO connector, wiring, and nearby grounds for damage or corrosion
  • Check relevant fuses and relays for ESO circuit
  • Attempt to actuate ESO with bi‑directional scan tool (command ON/OFF)

Signal parameters

  • Nominal supply: battery voltage (approx. 11–14.5 V with key on) at ESO feed terminal when circuit powered
  • Control signal: PCM switches ground or supply depending on vehicle design — check for command voltage/ground at ESO when actuated by scan tool
  • Coil resistance (typical solenoid coils commonly fall roughly between 2–50 ohms) — measure coil resistance at the solenoid harness with connector disconnected
  • Current draw when energized typically in the hundreds of milliamps to a couple amps — compare to specification if available
  • No PWM frequency expected on many ESO designs — look for steady supply when commanded unless system uses PWM

Diagnostic algorithm

  1. Safety first: key off, chock wheels, follow manufacturer safety procedures.
  2. Retrieve freeze frame, pending codes, and relevant live data with a scan tool; note whether PCM is commanding the ESO.
  3. Perform visual inspection of ESO connector, wiring loom, and chassis/engine grounds; repair obvious damage.
  4. Check fuses and relays for the ESO circuit; replace if blown or failed.
  5. With key ON (engine off) measure supply voltage at ESO feed terminal; should be battery voltage. If no voltage, trace back to fuse/relay and repair.
  6. Use a scan tool to command the ESO ON and OFF while measuring the control terminal for a switching ground or voltage; if PCM commands but ESO does not respond, suspect solenoid or short/open in wiring.
  7. Measure ESO coil resistance with connector disconnected; compare to spec. An open or very low resistance indicates a bad coil.
  8. Perform a voltage drop test on supply and ground circuits while commanding ESO to check for high resistance connections.
  9. If wiring and power/ground are good but solenoid doesn't actuate, replace ESO. After replacement, clear codes and confirm operation.
  10. If ESO does not receive command from PCM (no switching at connector), check PCM outputs, related sensors, and wiring for opens/shorts; consider PCM bench/diagnostic testing only after excluding wiring and power issues.
  11. After repairs, clear codes, perform functional test and road test as required. Monitor for recurrence and re‑scan.

Likely causes

  • Damaged wiring harness to ESO (chafing, rodent bite, pinched)
  • Corroded connector terminals at the solenoid
  • ESO coil out of specification (open or shorted)
  • Blown fuse or failed control relay for the ESO circuit

Fault status

⚠️ Status
P1170 — Engine Shut Off Solenoid Circuit Fault detected. Check ESO wiring, power/ground, connector, and solenoid operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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166

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