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 computer controlling the exhaust valve for cylinder 5 in your car's engine. It's like when a light switch is stuck in the 'on' position and won't turn off.
The engine control module (ECM) has detected a high voltage condition in the exhaust valve control circuit for cylinder 5.
P3440 is a diagnostic trouble code (DTC) for 'Cylinder 5 Exhaust Valve Control Circuit High.' This indicates that the ECM has detected an abnormally high voltage level in the exhaust valve control circuit for cylinder 5. This could be due to a short circuit, a faulty solenoid, or a wiring issue.
• Check Engine Light is on
• Engine may run rough or misfire
• Decrease in engine performance
• Faulty exhaust valve control solenoid
• Wiring issues such as short circuits or open circuits
• Faulty ECM (Engine Control Module)
ECM: Engine Control Module
DTC: Diagnostic Trouble Code
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors to the exhaust valve control solenoid for damage.
• Test the exhaust valve control solenoid for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the exhaust valve control solenoid if faulty.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Honda Accord
• Chevrolet Silverado
• GMC Sierra
• Regular maintenance and inspection of wiring and connectors.
• Timely replacement of faulty components.
• Ensure proper engine oil levels and quality.
Engine Performance
• Do not ignore the Check Engine Light.
• Have the vehicle diagnosed by a professional if unsure.
• Avoid driving the vehicle extensively until repaired.
Check with your vehicle manufacturer or warranty provider for coverage details.
This code has been associated with issues in vehicles using advanced cylinder deactivation technology.
Moderate – While the vehicle may still be drivable, it should be repaired soon to avoid further damage.
Driving with a malfunctioning exhaust valve control can lead to increased emissions and potential engine damage.
• Engine running
• Vehicle at operating temperature
The exhaust valve control solenoid is typically located on the engine near the cylinder head.
Q: Can I drive my car with a P3440 code?
A: It's possible to drive short distances, but it's recommended to get it fixed soon to avoid further damage.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to reduced engine performance and increased emissions.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.
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.
View options on Amazon
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.