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 there's a problem with the part of the car that controls how much air goes into the engine. It's like when you try to breathe through a straw and something is blocking it.
The engine control module (ECM) has detected an issue with the circuit that controls the intake air flow for diesel engines. This could mean that the circuit is open or not working properly.
P2390 indicates that the ECM has found an open or malfunction in the diesel intake air flow control circuit 'B'. This could be due to a wiring issue, a faulty sensor, or a problem with the ECM itself.
• Check Engine Light is on
• Reduced engine performance
• Poor fuel economy
• Faulty intake air flow sensor
• Damaged or corroded wiring or connectors
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the intake air flow sensor for proper operation.
• Replace or repair damaged wiring or connectors.
• Replace the intake air flow sensor if faulty.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $500
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram 2500
• Regular maintenance checks
• Keep wiring and connectors clean
• Use quality diesel fuel
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if you're unsure.
• Regularly check for any unusual engine noises.
Check with your vehicle manufacturer as some components may be covered under warranty.
This code has been associated with issues in diesel engines, particularly in vehicles with high mileage or poor maintenance history.
Moderate – It is important to address this issue to avoid potential engine performance problems.
Driving with a malfunctioning intake air flow sensor can lead to reduced engine performance and increased emissions.
• Engine at operating temperature
• Vehicle in a safe, stationary position
The intake air flow sensor is typically located near the air filter housing or along the air intake duct.
Q: Can I drive with a P2390 code?
A: It is not recommended to drive for long periods with this code active, as it can lead to engine performance issues.
Q: How do I reset the Check Engine Light after fixing the issue?
A: Use an OBD-II scanner to clear the codes after the repair is completed.
High-End · Full-system diagnostics
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Network faults often require full-system access instead of a generic code reader alone.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
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.