P0085 Code – Exhaust Valve Control Solenoid Circuit Low

The P0085 diagnostic trouble code (DTC) indicates that the engine control unit (ECU) has detected a low voltage condition in the exhaust valve control solenoid circuit on bank 2.

The exhaust valve control solenoid is part of the Variable Valve Timing (VVT) system. This system adjusts the timing of the exhaust valves depending on engine load, speed, and driving conditions.

The solenoid controls the flow of engine oil to the camshaft actuator, which changes the position of the exhaust camshaft. Adjusting valve timing helps improve:

• engine performance

• fuel efficiency

• emissions control

• overall engine efficiency

If the ECU detects that the voltage in the solenoid circuit is lower than the normal operating range, it will store the P0085 OBD2 code.

Bank 2 refers to the side of the engine that does not contain cylinder number 1.

Symptoms of Code P0085

Drivers may notice the following symptoms:

• Check Engine light illuminated

• Rough engine idle

• Reduced engine power

• Hesitation during acceleration

• Increased fuel consumption

• Poor throttle response

In some vehicles, the engine may enter limp mode to protect engine components.

Common Causes of P0085

Typical causes include:

• Faulty exhaust valve control solenoid

• Short circuit to ground in the wiring

• Damaged wiring harness

• Loose or corroded electrical connectors

• Low engine oil level

• Dirty or contaminated engine oil

• Faulty ECU driver circuit

Because the VVT system relies on clean oil and proper oil pressure, oil condition can directly affect system performance.

How Serious Is Code P0085

The P0085 code is considered a moderate severity problem.

The vehicle may still be drivable, but ignoring the issue may lead to:

• poor engine performance

• incorrect valve timing

• increased fuel consumption

• additional engine trouble codes

Repairing the problem early helps maintain proper engine operation.

How to Diagnose Code P0085

Diagnosis usually involves the following steps:

1. Scan the vehicle using an OBD2 diagnostic scanner

2. Check live data related to VVT system operation

3. Inspect the exhaust valve control solenoid

4. Check wiring and electrical connectors

5. Test solenoid resistance using a multimeter

6. Verify ECU control signals

Technicians often inspect engine oil level and quality, since VVT systems depend on proper lubrication.

How to Fix Code P0085

Possible repair solutions include:

• replacing the exhaust valve control solenoid

• repairing damaged wiring

• cleaning or replacing electrical connectors

• changing engine oil and oil filter

• clearing the fault code after repair

In many vehicles, replacing the solenoid resolves the issue.

Vehicles Commonly Affected by P0085

The P0085 trouble code may appear on vehicles equipped with variable valve timing systems, including:

• Toyota

• Nissan

• Honda

• Ford

• Volkswagen

• BMW

• Hyundai

Any modern engine using VVT technology can potentially trigger this code.

FAQ – P0085 Code

Can I drive with code P0085?

Yes, but engine performance may be reduced and fuel consumption may increase.

Can dirty engine oil cause this code?

Yes. Dirty or low engine oil can affect the VVT system.

Is the exhaust valve control solenoid difficult to replace?

In most vehicles it is relatively easy to replace and not very expensive.