P0085 — Exhaust Valve Control Solenoid Bank 2 – Circuit Low #

The code description may vary depending on the vehicle manufacturer.
Known label variations:

• Exhaust Valve Control Solenoid Circuit Low (Generic OBD-II)
• Exhaust Valve Control Solenoid Bank 2 Circuit Low (GM, Ford, Chrysler)
• VVT Exhaust Solenoid Circuit Low Bank 2 (Toyota, Nissan)
• Exhaust Valve Timing Control Solenoid Low Voltage Bank 2 (Honda, Hyundai, Kia)

Summary of Code P0085 #

P0085 is a generic powertrain code that indicates an issue detected by the vehicle’s Engine Control Module (ECM) or Powertrain Control Module (PCM) with the exhaust valve control solenoid circuit on bank 2. In plain English, this means the ECM has measured a voltage in the electrical circuit for the exhaust valve timing solenoid (sometimes called the VVT solenoid or Variable Valve Timing solenoid) that is lower than expected on the side of the engine that does not include cylinder 1 (bank 2). This solenoid is critical for adjusting exhaust valve timing for performance and emissions. A “circuit low” code typically points to an electrical issue—such as a short to ground, poor connection, or a failing solenoid—rather than a purely mechanical fault. Left unaddressed, this code can lead to drivability problems and increased emissions.

Frequent Symptoms for Code P0085 #

When P0085 is stored, you may notice several warning signs that indicate your exhaust valve timing is not being controlled as intended. These symptoms can range from mild to severe, depending on how long the problem is present and whether it has affected other engine components.

• Check Engine Light (CEL) illuminated
• Rough idle or fluctuating RPMs
• Poor acceleration or sluggish engine response
• Decreased fuel economy
• Engine hesitation or surging
• Possible stalling, especially at idle
• Increased exhaust emissions

Probable Causes for Code P0085 (Most to Least Common) #

A “circuit low” fault almost always points to an electrical issue in the exhaust valve control system. While a faulty solenoid is the most common culprit, the problem can originate anywhere along the signal path. Here are the most likely causes, in order of frequency:

1. Faulty exhaust valve control solenoid (VVT solenoid)
2. Wiring issues (damaged, corroded, or shorted wires/connectors in the solenoid circuit)
3. Poor electrical connection at the solenoid or ECM/PCM connector
4. Low system voltage or a weak battery affecting circuit performance
5. Malfunctioning ECM/PCM (rare, but possible)
6. Blown fuse in the VVT solenoid circuit
7. Contaminated oil causing solenoid sticking (less common for “circuit low,” but possible if it causes solenoid failure)

Step-by-Step Diagnostic for Code P0085 #

Diagnosing P0085 involves a systematic approach to isolate the root cause—starting with the most common and easiest-to-check issues. You’ll need a basic multimeter, scan tool, and possibly a wiring diagram for your specific vehicle.

• 1. Verify the code with a scan tool and note any related codes (especially VVT or oil pressure codes).
• 2. Inspect the wiring and connectors at the exhaust VVT solenoid for bank 2 for signs of corrosion, damage, or loose pins.
• 3. Check the battery voltage and charging system to ensure proper power supply to the circuit.
• 4. Use a multimeter to check for proper voltage at the solenoid connector (with key ON) and continuity to the ECM/PCM.
• 5. Test the solenoid resistance (compare to OEM specs) and check for internal shorts or opens.
• 6. Swap the solenoid with the one from bank 1 (if identical and accessible) to see if the code moves.
• 7. Check for blown fuses in the VVT or engine control circuits.
• 8. If all else checks out, consider ECM/PCM testing or reprogramming (rarely required).

Possible Repairs for Code P0085 #

Once the source of the “circuit low” reading is confirmed, the following repairs may be required. Always clear the code and retest after repairs to verify the fix.

• Replace the exhaust valve control solenoid (bank 2) if faulty
• Repair or replace damaged wiring or connectors in the solenoid circuit
• Clean corroded connectors and ensure tight electrical contacts
• Replace blown fuse(s) in the VVT/solenoid circuit
• Correct low battery or alternator output if system voltage is inadequate
• ECM/PCM replacement or programming (only if all other causes are eliminated)
• Perform an engine oil change if oil contamination is suspected (recommended as preventative maintenance)

Is It Safe to Drive With Code P0085? #

Limited — While driving with code P0085 is often possible for short distances, it is not recommended for extended periods. The vehicle may run rough, have reduced power, or stall unexpectedly, which can create unsafe driving conditions—especially in traffic or at intersections. Prolonged operation can also increase emissions and risk damage to the catalytic converter due to improper valve timing. Addressing this code as soon as possible is the safest choice.

Vehicles Most Commonly Affected by Code P0085 #

Code P0085 can appear in any vehicle equipped with variable valve timing (VVT) systems and OBD-II, but it is most frequently seen in certain makes and engine families. The following brands and models have reported this code more often, typically on V6 or V8 engines with banked cylinder layouts:

• Chevrolet (Silverado, Malibu, Traverse, Camaro)
• Ford (F-150, Explorer, Fusion, Edge)
• Nissan (Altima, Maxima, Pathfinder, Frontier)
• Toyota (Tacoma, 4Runner, Camry, Tundra)
• Hyundai/Kia (Santa Fe, Sorento, Sonata)
• Honda (Accord V6, Pilot, Ridgeline, Odyssey)
• Chrysler/Dodge/Jeep (Ram, Grand Cherokee, Charger, Durango)

Common Mistakes & Best Practices for Code P0085 #

Misdiagnosis is common with VVT solenoid codes because symptoms often overlap with other engine issues. To avoid wasted time and money, follow these best practices:

• Don’t replace the solenoid first—always check wiring and connectors for obvious faults before spending on parts.
• Don’t ignore oil maintenance—dirty oil can cause VVT solenoid sticking, even though “circuit low” usually points electrical.
• Confirm the correct bank—bank 2 is not always the passenger side; check your OEM documentation.
• Always clear codes and perform a road test after repairs to ensure the issue is resolved.
• Don’t overlook related codes—multiple VVT or oil pressure codes suggest a broader system issue.

Quick FAQ for Code P0085 #

Questions about P0085 are common, especially for DIYers and owners facing their first VVT-related warning. Here are a couple of the most frequent:

• Can I ignore P0085 if my car seems to run fine?
  Even if performance seems normal, ignoring P0085 can lead to premature engine wear, increased emissions, and, in some cases, unpredictable stalling. Address it promptly.
• How much does it cost to fix code P0085?
  Repair costs vary. Replacing a VVT solenoid typically runs $75–$250 for parts and labor, while wiring repairs may cost less if DIY. Dealer diagnosis can add $100–$200, but accurate troubleshooting saves money in the long run.