Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is saying that there's a problem with controlling how the exhaust comes out of cylinder number 8. It's like a switch isn't working right for letting the air out.
The P3464 code indicates an issue with the electrical circuit controlling the exhaust valve for cylinder 8, where the voltage is higher than expected.
This diagnostic trouble code (DTC) is triggered when the powertrain control module (PCM) detects a high voltage condition in the exhaust valve control circuit for cylinder 8. This could be due to a short circuit, faulty wiring, or a malfunctioning valve actuator.
• Check Engine Light is on
• Engine misfires
• Reduced engine performance
• Faulty exhaust valve actuator
• Short circuit in the wiring
• Faulty PCM
PCM: Powertrain Control Module, the computer that controls the engine and transmission.
Actuator: A device that controls a mechanism or system, such as opening or closing a valve.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections for cylinder 8 exhaust valve.
• Test the exhaust valve actuator for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the exhaust valve actuator.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular maintenance checks
• Ensure wiring is intact and free of corrosion
• Use quality parts for replacements
Engine Performance
• Do not ignore the Check Engine Light.
• Seek professional help if unsure about repairs.
Repairs may be covered under the powertrain warranty if the vehicle is still within the coverage period.
The P3464 code is relatively uncommon and typically associated with specific models using advanced valve control systems.
Moderate – The vehicle may still be drivable, but performance issues could worsen over time.
Driving with a malfunctioning exhaust valve can lead to increased emissions and potential engine damage.
• Engine running
• Vehicle at operating temperature
The exhaust valve actuator for cylinder 8 is located on the engine's cylinder head, typically on the passenger side for V8 engines.
Q: Can I drive my car with a P3464 code?
A: It's possible to drive short distances, but it's best to fix the issue soon to avoid further damage.
Q: What happens if I ignore the P3464 code?
A: Ignoring the code can lead to reduced engine performance and potential damage to the engine over time.
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A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
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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.