What Does P0190 Mean?
This code indicates the fuel temperature sensor B circuit is producing an intermittent signal. The ECM has detected momentary dropouts, spikes, or erratic voltage changes from the sensor that do not correlate with actual fuel temperature changes. This typically points to a wiring or connection issue rather than a genuine fuel temperature anomaly.
Common Causes
35%
Corroded or loose fuel temperature sensor B connector causing intermittent electrical contact
30%
Intermittent open or short in the fuel temperature sensor B signal wire due to vibration fatigue or chafing
25%
Failing fuel temperature sensor B with an internally cracked thermistor element
10%
Poor ECM ground or connector pin contact on the sensor input circuit
Diagnostic Steps
1
Step 1: Monitor the fuel temperature sensor B PID on a scan tool while performing a wiggle test on the sensor connector and wiring. Note any sudden value jumps that correlate with harness movement.
2
Step 2: Disconnect the fuel temperature sensor B connector and inspect both halves for corroded, bent, or backed-out terminals. Clean contacts with electrical cleaner and verify terminal lock tabs are secure.
3
Step 3: Measure resistance of the sensor itself across a range of temperatures; a good NTC thermistor should read approximately 2.4k ohms at 68 degrees F, decreasing smoothly as temperature rises. Erratic jumps in resistance confirm sensor failure.
4
Step 4: Check continuity and resistance of the signal and ground wires from the sensor connector to the ECM while flexing the harness. Any fluctuation indicates an intermittent break requiring wire repair.
5
Step 5: After repairs, clear the code and drive through at least two warm-up cycles to verify the code does not return.
Estimated Repair Cost
$80 - $280
Parts + labor, varies by vehicle and location
This code indicates the fuel temperature sensor B circuit is producing an intermittent signal. The ECM has detected momentary dropouts, spikes, or erratic voltage changes from the sensor that do not correlate with actual fuel temperature changes. This typically points to a wiring or connection issue...
The most common cause of P0190 (Fuel Temperature Sensor B Circuit Intermittent) is: Corroded or loose fuel temperature sensor B connector causing intermittent electrical contact
Typical repair costs for P0190 range from $80 to $280, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An intermittent fuel temperature signal may cause minor fuel trim inaccuracies, but typically does not create an immediate safety hazard. Prolonged operation may slightly reduce fuel economy and increase emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0190 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Delivery System
Difficulty
Type
Generic (SAE)
Recommended Tools
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