Code P3413 indicates the powertrain control module (PCM) has detected an open circuit in the electrical control for the cylinder 2 exhaust valve. This typically means the PCM cannot command or monitor the exhaust valve actuator (often part of a variable valve timing, cylinder deactivation, or engine braking system) because the circuit is broken, preventing proper valve operation.
The solenoid or actuator itself may have an internal open circuit, preventing it from functioning. This is a common failure point due to heat, oil contamination, or wear.
Wiring between the PCM and the actuator can become chafed, broken, or corroded, especially near the engine where heat and vibration are present. Connector pins may also be bent, pushed out, or corroded.
A break in the wire (open) or a short to voltage/ground can cause the circuit to read as open. This may be intermittent and triggered by engine movement.
Many exhaust valve control systems rely on proper oil pressure and flow. Low oil or the wrong viscosity can cause the actuator to stick or not respond, sometimes setting circuit codes.
A stuck or broken valve, collapsed lifter, or failed rocker arm can prevent the actuator from moving, which may be interpreted as an open circuit if the system monitors position feedback.
The PCM driver for the circuit can fail internally, but this is the least likely cause. It should only be considered after all other possibilities have been thoroughly ruled out.
It is not recommended. The engine may run poorly, misfire, or enter limp mode, which can cause further damage to the catalytic converter or engine components. Address the issue promptly.
No. While PCM failure is possible, it is very rare. The vast majority of cases are due to a faulty actuator, wiring problem, or oil-related issue. Replacing the PCM without thorough diagnosis is a common misstep and often does not fix the problem.
Yes. Many exhaust valve control systems are hydraulically actuated. Low oil level, dirty oil, or incorrect viscosity can prevent proper operation and trigger circuit-related codes. Always check oil first.
The code may clear if the fault is intermittent and the PCM no longer detects the open circuit after several drive cycles. However, the underlying problem will likely return and should be diagnosed and repaired.