P1190

FTS High - Fuel Pump Temperature Sensor High

Powertrain Fuel and Air Metering Fuel pump temperature 🟡 Moderate — Fix within a week ⚠️ Drive with Care
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What This Actually Means

In plain language — no jargon

The fuel pump temperature sensor is reading a temperature signal that's too high, like a thermometer stuck on the hot end. This tells the ECU the fuel is overheating, which can reduce fuel pressure and engine performance.

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Symptoms You May Notice

3 known symptoms for this code
Check Engine Light (CEL) illuminated
Reduced fuel pressure or hard starting
Engine hesitation or loss of power under load
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the fuel pump temperature sensor voltage, which inversely correlates to fuel temperature. When the sensor voltage reads too low (indicating high temperature), the ECU triggers this fault. The threshold is typically around 250°F (121°C) or higher depending on the vehicle.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Fuel Temperature Signal Voltage 0.5-4.5V (approximately 40-100°F fuel temp) Below 0.5V (above 250°F fuel temp)
Fuel Pump Temperature Resistance 100-10,000 ohms depending on temp range Below expected resistance for high temp condition
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Fuel pump temperature sensor connector
Inspect and clean the sensor connector for corrosion or loose pins that may cause false high-temp readings.
2
Fuel pump temperature sensor
Replace the sensor if it reads consistently high or has internal resistance issues; typically located in or near the fuel tank.
3
Engine cooling system and fuel line routing
Check for actual overheating conditions: ensure radiator is clean, coolant levels are correct, and fuel lines aren't routed near hot engine areas.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code P1190 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code P1190

What happens after you fix the fault

Once the fault is repaired, P1190 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.