What Does P1163 Mean?
This code indicates the fuel temperature sensor circuit is open or shorted to the positive voltage rail. The fuel temperature sensor measures fuel rail or fuel tank temperature so the PCM can compensate fuel injection pulse width for fuel density changes at different temperatures. An open or short-to-positive condition causes the PCM to receive maximum voltage, indicating an incorrect (very cold) fuel temperature reading and potentially over-fueling the engine.
Common Causes
30%
Open circuit in the fuel temperature sensor wiring (broken or disconnected wire)
25%
Failed fuel temperature sensor with open internal thermistor
20%
Corroded or backed-out connector pins at the fuel temperature sensor
15%
Signal wire chafed against a fuel line and shorted to the 5V reference
10%
Faulty PCM input pin for the fuel temperature signal
Diagnostic Steps
1
Read fuel temperature from live data; a fixed reading of -40°F (-40°C) or an implausibly low value confirms an open or short-to-positive fault.
2
Disconnect the fuel temperature sensor and measure resistance across the terminals; should be approximately 2,000-4,000 ohms at room temperature. An infinite reading confirms an open sensor.
3
Check for continuity on the signal wire from the sensor connector to the PCM; repair any open sections found.
4
Inspect the connector for corrosion, moisture, or terminals that are not making proper contact.
5
Replace the fuel temperature sensor if resistance is out of specification.
Estimated Repair Cost
$80 - $300
Parts + labor, varies by vehicle and location
This code indicates the fuel temperature sensor circuit is open or shorted to the positive voltage rail. The fuel temperature sensor measures fuel rail or fuel tank temperature so the PCM can compensate fuel injection pulse width for fuel density changes at different temperatures. An open or short-t...
The most common cause of P1163 (Fuel Temperature Sensor Open/Short To Positive) is: Open circuit in the fuel temperature sensor wiring (broken or disconnected wire)
Typical repair costs for P1163 range from $80 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No significant safety risk. The engine may run slightly rich due to incorrect fuel density compensation, resulting in marginally higher fuel consumption and emissions, but driveability is largely unaffected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1163 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Manufacturer
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