P3472 indicates that the powertrain control module (PCM) has detected a high voltage condition on the control circuit for the cylinder 9 exhaust valve actuator, typically a solenoid or variable‑valve‑timing (VVT) oil‑control valve. In normal operation the PCM commands the actuator to adjust exhaust‑valve timing or lift; a high‑circuit reading means the expected ground or low‑side control is not present, preventing proper valve operation for that cylinder. The code is set when the commanded state does not match the observed circuit voltage.
The solenoid that drives the cylinder‑9 exhaust valve can internally short or stick, causing the circuit to read high voltage.
An open, short, or high‑resistance condition in the signal wire between the PCM and the actuator can produce a high‑voltage reading.
Moisture, corrosion, or poor pin contact at the actuator connector can prevent proper grounding and create a high‑circuit condition.
If engine oil pressure is insufficient or the oil is dirty, the actuator may not move correctly, leading to abnormal circuit voltages.
Sludge or carbon buildup can restrict oil flow to the variable‑valve‑timing mechanism, affecting actuator operation.
A malfunction within the PCM that misinterprets the circuit voltage can set P3472, but this should be confirmed only after all other components have been verified.
No. The PCM is rarely the root cause. In most cases the problem is a faulty actuator, wiring issue, or low/ dirty oil. PCM replacement should only be considered after all other components have been verified.
Yes. If oil pressure is too low or the oil is contaminated, the actuator may not move correctly, causing an abnormal voltage reading on the circuit.
Driving with a malfunctioning cylinder‑9 exhaust valve can lead to reduced performance, higher emissions, and potential engine damage, so the issue should be addressed promptly.
P3472 is specific to the exhaust‑valve control circuit for cylinder 9. Each cylinder with variable valve timing has its own dedicated actuator and circuit; a fault in another cylinder would trigger a different code.