Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected water in the fuel, which can cause problems because engines need clean fuel to run properly. Imagine trying to drink water with dirt in it - it wouldn't be good for you!
The engine control module (ECM) has detected the presence of water in the fuel system through Sensor B, which is responsible for monitoring fuel quality.
The P238F code indicates that the ECM has received a signal from Sensor B that suggests there is water contamination in the fuel. This can cause poor engine performance and potential damage if not addressed.
• Check Engine Light is on
• Poor engine performance
• Engine misfires
• Contaminated fuel from a gas station
• Faulty water-in-fuel sensor
• Fuel tank condensation
ECM: Engine Control Module, the computer that manages the engine's functions.
OBD-II: On-Board Diagnostics, a system that monitors vehicle performance and emissions.
• Check for any other related codes.
• Inspect the fuel for water contamination.
• Test the water-in-fuel sensor for proper operation.
• Drain and replace contaminated fuel.
• Replace the faulty water-in-fuel sensor.
• Clean the fuel system if necessary.
• OBD-II scanner
• Fuel siphon pump
• Multimeter
$100 - $300
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram 2500
• Use high-quality fuel from reputable stations.
• Regularly check and maintain the fuel system.
• Keep the fuel tank full to minimize condensation.
Sensor Issue
• Avoid driving the vehicle until the issue is fixed to prevent engine damage.
• Consider using a fuel additive to remove water from the fuel system.
Check with your vehicle manufacturer for warranty coverage on fuel system components.
Water-in-fuel issues have been more common in diesel engines, but can occur in gasoline engines as well due to poor fuel quality.
High – Water in fuel can cause severe engine damage if not addressed promptly.
Driving with water in the fuel can lead to engine failure and is a safety risk. Address this issue immediately.
• Engine at operating temperature
• Vehicle on a flat surface
The water-in-fuel sensor is typically located near the fuel filter or within the fuel tank.
Q: Can I drive with a P238F code?
A: It's not recommended to drive with this code active, as water in the fuel can cause engine damage.
Q: How does water get into the fuel?
A: Water can enter the fuel system through condensation or contaminated fuel from a gas station.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.