P0085 indicates that the powertrain control module (PCM) has detected a low voltage condition in the exhaust valve control solenoid circuit for bank 2. This solenoid is part of the variable valve timing (VVT) system, and the low circuit signal typically points to an electrical fault such as a short to ground, open circuit, or a failed solenoid.
The solenoid itself is the most common failure point. Internal shorts or open windings can cause a low circuit condition.
Damaged, corroded, or loose wiring/connectors in the solenoid circuit can create a short to ground or an open circuit, triggering the low voltage code.
Many VVT solenoids rely on proper oil pressure to operate. Low oil level or pressure can cause the solenoid to draw abnormal current, leading to a low circuit code.
A failed PCM is an uncommon cause for P0085. It should only be considered after thoroughly testing the solenoid, wiring, and oil system.
You may be able to drive short distances, but the vehicle may experience reduced performance, rough idling, or stalling. Continued driving could cause further engine damage, especially if the issue is related to oil pressure.
No. The PCM is rarely the cause. Most often the problem is a faulty solenoid, wiring issue, or low oil pressure. Replacing the PCM without proper diagnosis is not recommended.
It means the PCM detects that the voltage on the solenoid control circuit is lower than expected, typically indicating a short to ground, an open circuit, or a solenoid with abnormally low resistance.
The fix depends on the root cause. Common repairs include replacing the exhaust valve control solenoid, repairing damaged wiring or connectors, or addressing low oil level/pressure. Always diagnose before replacing parts.