OBD-II code P3487 indicates a low voltage condition in the exhaust valve control circuit for cylinder 11. This typically affects engines with variable valve timing or cylinder deactivation systems, signaling that the powertrain control module detected voltage below the expected threshold for the specific solenoid or actuator controlling the exhaust valve.
The solenoid responsible for actuating the exhaust valve mechanism on cylinder 11 has internally failed or developed a short circuit, causing low resistance and low voltage readings.
Wires leading to the cylinder 11 exhaust valve solenoid may be frayed, corroded, or shorted to ground, while connectors may have loose pins or moisture intrusion.
Variable valve timing and cylinder deactivation systems rely on hydraulic pressure; low oil levels, degraded oil, or a failing oil pump can prevent proper solenoid operation.
Carbon buildup or mechanical failure within the exhaust valve lifters or rocker arms on cylinder 11 can prevent the solenoid from moving the valve, triggering a circuit error.
A dedicated fuse for the valve control circuit may have blown, or the control relay may be malfunctioning, cutting power to the specific bank or cylinder group.
While rare, the internal driver circuit within the PCM responsible for grounding the solenoid control circuit may have failed, though this is rarely the primary cause.
It is generally not recommended to drive extensively with this code, as the engine may enter limp mode, suffer from reduced power, or experience increased emissions and fuel consumption.
No, replacing the PCM is rarely the correct fix for P3487; the issue is almost always a failed solenoid, wiring problem, or oil pressure issue, and the computer should only be suspect after all other components are ruled out.
Yes, sludge or low oil pressure can prevent the hydraulic components of the valve control system from operating correctly, leading the system to register a circuit malfunction.
No, P3487 is specific to cylinder 11; however, similar codes with different suffixes will appear if other cylinders experience the same exhaust valve control circuit low condition.