Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car uses sensors to know where parts of the engine are. This code means one of those sensors isn't working right, kind of like a broken thermometer that can't tell you the temperature.
The engine control module (ECM) has detected a problem with the signal from the Camshaft Position Sensor B on Bank 2.
The P0390 code is triggered when the ECM detects a malfunction in the circuit of the Camshaft Position Sensor B on Bank 2. This sensor monitors the position of the camshaft to ensure proper timing and operation of the engine.
• Check Engine Light is on
• Engine may run rough or misfire
• Poor fuel economy
• Faulty Camshaft Position Sensor B
• Wiring issues such as damaged wires or poor connections
• 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.
• Test the Camshaft Position Sensor B for proper operation.
• Replace the faulty Camshaft Position Sensor B.
• Repair any damaged wiring or connectors.
• Replace or reprogram the ECM if necessary.
• OBD-II Scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular maintenance checks
• Ensure wiring harnesses are secure
• Replace sensors at recommended intervals
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional if unsure.
Check with your vehicle manufacturer; some powertrain warranties may cover sensor issues.
P0390 is a common code that has been reported across various makes and models, often due to sensor failure or wiring issues.
Moderate – While the vehicle may still run, ignoring this issue can lead to more significant problems.
Driving with a malfunctioning sensor can lead to increased emissions and potential engine damage.
• Engine running
• Warm engine
The Camshaft Position Sensor B for Bank 2 is typically located near the camshaft on the opposite side of the engine from Bank 1.
Q: What happens if I ignore the P0390 code?
A: Ignoring this code can lead to poor engine performance and increased emissions.
Q: Can I drive my car with a P0390 code?
A: While you might still be able to drive, it's best to address the issue to avoid further damage.
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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
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.