Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car's engine that controls when the air intake valves open and close on one side of the engine.
The P340B code indicates an issue with the electrical circuit that controls the deactivation or activation of intake valves on the second bank of the engine.
The P340B code is triggered when the Engine Control Module (ECM) detects a malfunction in the deactivation or intake valve control circuit for bank 2. This could involve an open or short circuit, or a failure in the actuator or solenoid responsible for valve control.
• Check Engine Light illuminated
• Reduced engine performance
• Engine misfires or runs rough
• Faulty intake valve control solenoid
• Open or shorted wiring in the valve control circuit
• Poor electrical connection in the valve control circuit
ECM: Engine Control Module
Solenoid: A device that converts electrical energy into mechanical movement
• Use an OBD-II scanner to confirm the code and check for additional codes.
• Inspect the wiring and connectors for the intake valve control solenoid on bank 2.
• Test the intake valve control solenoid for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty intake valve control solenoid.
• Clear the code and test drive to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance checks
• Ensure proper engine oil levels
• Use quality fuel and oil
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
Check with your vehicle's manufacturer for specific warranty coverage related to engine components.
This code has been associated with issues in vehicles with advanced valve timing systems.
Moderate – Addressing this issue promptly can prevent further engine damage.
Operating a vehicle with a malfunctioning engine component could lead to decreased performance and increased emissions.
• Engine at operating temperature
• Vehicle at idle
The intake valve control solenoid is typically located on the engine's cylinder head, near the intake valves.
Q: Can I drive with a P340B code?
A: It's not recommended to drive for extended periods with this code, as it can lead to further engine issues.
Q: What happens if I ignore the P340B code?
A: Ignoring this code can result in reduced engine performance and potential damage to the engine.
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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.