Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P1117 — Engine Coolant Temperature Sensor Intermittent

P1117 — Engine Coolant Temperature Sensor Intermittent

Detailed page for trouble code P1117.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P1117

LAND ROVER P — Powertrain

Engine Coolant Temperature Sensor Intermittent

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

Causes

  • Loose, corroded, or damaged ECT sensor connector or terminals
  • Broken, chafed, or intermittent wiring in the ECT circuit (open/short to ground or battery)
  • Failing or internally intermittent ECT sensor (thermistor)
  • Poor engine/chassis ground or power/5V reference circuit fault
  • Coolant intrusion or contamination at the sensor connector
  • PCM input circuit fault (less common)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated intermittently
  • Erratic or fluctuating coolant temperature gauge or scanner PID
  • Difficult cold start, poor idle or rich/lean fuel trims when circuit misreports temperature
  • Cooling fan cycling incorrectly or not engaging based on false temp readings
  • Possible increased fuel consumption and failed emissions readiness
  • Stalling or hesitation under some conditions if PCM uses ECT for fueling

What to check

  • Read freeze frame and pending/continuous status with a scan tool; note conditions when fault set
  • Monitor live ECT PID while cold start, warm-up and under drive conditions — check for smooth, plausible temperature rise
  • Compare scanner temperature reading to actual engine temperature (infrared thermometer or thermometer at thermostat housing)
  • Visually inspect ECT connector for corrosion, bent pins, water, or damaged latch
  • Wiggle test harness and connector while monitoring live PID and watch for intermittent changes or flicker
  • Backprobe sensor connector: verify reference voltage (if applicable), ground continuity, and signal voltage behavior during warm-up

Signal parameters

  • ECT signal is a thermistor-based temperature value — resistance decreases as temperature rises (NTC behavior)
  • Signal voltage will vary with design; expect a smooth, continuous change as engine warms (typical on most systems: signal within ~0.1–4.9 V range depending on temperature and circuit design)
  • During cold start the PCM should read a low-temperature value and slowly increase to operating temperature; abrupt jumps, dropouts or frozen values indicate fault
  • Resistance should change steadily with temperature (no open circuit or infinite resistance at normal temps)

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data; note when P1117 set (cold, hot, vibration).
  2. Monitor live ECT PID while performing key-on, cranking, cold start and warm-up. Look for smooth progression; reproduce intermittent condition by wiggling harness.
  3. Visually inspect sensor and connector for corrosion, contamination, bent pins or water. Securely reseat connector. Replace if damaged.
  4. Backprobe connector: verify reference voltage (if applicable), signal voltage behavior and ground. Check for intermittent voltage loss while moving harness.
  5. With engine cool and then hot, measure sensor resistance and confirm it changes with temperature (resistance should decrease as temperature rises). If resistance is erratic or open at any temp, replace sensor.
  6. Check continuity and insulation of harness between sensor and PCM; repair any chafing, broken conductors or shorts to battery/ground. Use shorting/ohm tests and insulation inspection.
  7. Repair or replace connector/pins as needed (clean, solder or use new terminal as required). Protect with dielectric grease if allowed.
  8. If wiring and sensor check good but problem persists, inspect PCM input circuit and grounds; consider PCM testing or replacement as last resort.
  9. Clear codes, perform road/drive cycle and re-scan to confirm the intermittent fault is resolved.

Likely causes

  • Damaged connector pins or water ingress causing intermittent contact
  • Wiring broken inside insulation or pinched by engine movement leading to intermittent open/short
  • Thermistor inside sensor failing when hot or under vibration
  • Intermittent loss of reference voltage or poor ground at sensor
  • Corroded terminal that makes contact intermittently

Fault status

⚠️ Status
Intermittent fault detected on the Engine Coolant Temperature sensor circuit. PCM logged an erratic or out-of-range coolant temperature signal; fault is not continuously present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0115 P0116 P0117 P0118 P0128 P0125
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .