Failed exhaust valve control solenoid or actuator on cylinder 8; Open or damaged wiring in the control circuit between the PCM and the solenoid; Corroded, loose, or pushed-back terminal at the solenoid or PCM connector; Short to voltage on the control wire, often from chafed insulation; Internal PCM driver failure for that specific circuit; Oil sludge or debris blocking the solenoid, causing it to draw abnormal current and set a high-voltage code; Aftermarket or incorrect solenoid installed previously

DTC codes / P34xx · Auxiliary emission controls / P3464

P3464Cylinder 8 Exhaust Valve Control Circuit High

Q: What does code P3464 mean?

Cylinder 8 Exhaust Valve Control Circuit High. P3464 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for cylinder 8's exhaust valve, which is part of a variable valve timing or cylinder deactivation system. The PCM expects the circuit to pull to a specific voltage when commanded, and a high reading tells it the circuit is open, shorted to power, or the actuator has failed.

P3464 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for cylinder 8's exhaust valve, which is part of a variable valve timing or cylinder deactivation system. The PCM expects the circuit to pull to a specific voltage when commanded, and a high reading tells it the circuit is open, shorted to power, or the actuator has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or misfire-like shaking, especially when the engine is cold or under light load
Reduced engine power or a limp-home mode in some vehicles
Poor fuel economy or increased emissions
Audible ticking or tapping from the valve cover area on the affected bank
Intermittent driveability problems that come and go with temperature or vibration

Common causes, most likely first

Failed exhaust valve control solenoid or actuator on cylinder 8
Open or damaged wiring in the control circuit between the PCM and the solenoid
Corroded, loose, or pushed-back terminal at the solenoid or PCM connector
Short to voltage on the control wire, often from chafed insulation
Internal PCM driver failure for that specific circuit
Oil sludge or debris blocking the solenoid, causing it to draw abnormal current and set a high-voltage code
Aftermarket or incorrect solenoid installed previously

How to diagnose and fix it

Scan all modules and record freeze-frame data to confirm the code is current and not history
Inspect the solenoid connector and wiring harness for corrosion, chafing, or loose pins
Measure resistance of the cylinder 8 exhaust valve control solenoid and compare to the manufacturer's specification
Back-probe the control circuit at the PCM and check for voltage with the key on and engine off, looking for a short to power
Perform a wiggle test on the harness while monitoring the circuit with a scan tool or multimeter
If wiring and solenoid test good, check for oil sludge or mechanical binding in the valve control mechanism
Replace the faulty solenoid or repair the wiring, clear the code, and verify the repair with a road test

What a high-voltage valve code really means

A high-voltage code on a valve control circuit often points to an open circuit rather than a short, because the PCM pulls the circuit up and sees full voltage when the solenoid is disconnected.
Technicians sometimes replace the solenoid only to find a corroded ground or a chafed wire a few inches away, so always inspect the entire circuit before condemning the part.
This code can be set by a weak battery or charging system fault that causes the PCM to misread circuit voltage during cranking.
On engines with cylinder deactivation, a failed exhaust valve solenoid can cause the affected cylinder to stay on an exhaust lobe, leading to misfire codes that mask the real problem.
A generic P3464 does not tell you which bank or engine configuration; always confirm cylinder 8 location and valve control strategy in the service information for the specific vehicle.

Can I keep driving with P3464?

You can usually drive short distances to a repair shop, but avoid heavy acceleration or towing because a stuck exhaust valve can cause misfires and overheating. If the engine runs rough or loses power, stop driving and have it towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.