P3453 indicates that the exhaust valve control circuit for cylinder 7 has an open circuit, meaning the PCM is not receiving a proper signal from the valve’s control solenoid. The code means the PCM cannot properly control the exhaust valve timing for that cylinder.
The solenoid that opens and closes the exhaust valve for cylinder 7 may have failed, creating an open circuit.
A broken wire, loose terminal, or short in the wiring harness to the solenoid can interrupt the signal.
Oxidation or poor contact at the solenoid connector can cause an open circuit condition.
The internal driver that supplies power to the solenoid may be defective, but this is less common.
A seized exhaust valve can prevent movement, but it usually triggers additional mechanical codes.
It is possible but uncommon; most often the issue is a faulty solenoid, wiring, or connector.
Only if a mechanical inspection shows the valve is stuck or damaged; otherwise the problem is electrical.
It may clear if the fault is intermittent, but the underlying issue usually remains until repaired.
Yes, it affects exhaust valve timing and can impact emissions, so the vehicle may fail an emissions test.