P0027 Fault Code

P0027 OBD-II Trouble Code Short Description

Exhaust Valve Control solenoid Circuit Range/Performance Bank 1

What does trouble code P0027 mean?

The P0027 fault code relates to the Exhaust Valve Control solenoid Circuit Range/Performance on Bank 1 of a car's engine. This code is typically seen in vehicles with variable valve timing (VVT) systems.

The Exhaust Valve Control solenoid is responsible for controlling the timing of the exhaust valves, which helps optimize engine performance and fuel efficiency. The solenoid receives signals from the engine control module (ECM) and adjusts the position of the camshaft accordingly.

When the ECM detects that the signal from the Exhaust Valve Control solenoid Circuit on Bank 1 is outside the expected range or not performing as it should, it triggers the P0027 fault code.

There are several potential causes for this fault code, including:

  1. Faulty Exhaust Valve Control solenoid: The solenoid itself may be malfunctioning and not responding correctly to signals from the ECM.

  2. Wiring or electrical connection issues: Loose connections, damaged wiring, or corroded terminals can disrupt the communication between the solenoid and ECM.

  3. Engine oil problems: Issues like low oil pressure, dirty oil, or incorrect oil viscosity can affect the performance of the solenoid and trigger the fault code.

To diagnose and resolve the P0027 code, it is recommended to:

  1. Inspect the wiring and connections: Check for any loose connections, damaged wires, or corrosion. Repair or clean as necessary.

  2. Verify engine oil condition: Ensure that the oil level is correct and clean. If needed, change the oil and filter using the recommended grade as specified by the vehicle manufacturer.

  3. Test or replace the Exhaust Valve Control solenoid: The solenoid may need to be tested using a multimeter or replaced if found faulty.

It is advisable to consult a qualified mechanic or utilize diagnostic equipment to accurately diagnose the issue and carry out the necessary repairs. Ignoring or neglecting the P0027 fault code can lead to reduced engine performance, increased fuel consumption, and potentially more severe engine damage over time.


What are the symptoms of the P0027 code?

  • Check Engine Light is illuminated
  • Poor engine performance
  • Engine misfires or stalls
  • Reduced fuel efficiency
  • Rough idling
  • Hesitation or lack of power during acceleration
  • Increased exhaust emissions


What causes the P0027 code?

The P0027 fault code is usually caused by one or more of the following issues:

  1. Faulty exhaust valve control solenoid: The solenoid may be malfunctioning, preventing the proper control of the exhaust valve.

  2. Electrical problems: There could be issues with the wiring or connectors related to the exhaust valve control solenoid circuit.

  3. Engine oil problems: Insufficient or contaminated engine oil can affect the performance of the exhaust valve control solenoid and cause the fault code.

  4. Mechanical issues: Problems with the timing chain or camshaft can also trigger the P0027 code.

It is recommended to diagnose the specific cause of the fault code using a diagnostic scanner and performing further troubleshooting to determine the exact issue and necessary repairs.

Possible Solutions

How to fix P0027?

The P0027 fault code indicates a problem with the exhaust valve control solenoid circuit range or performance in bank 1. This code is commonly found in vehicles with variable valve timing (VVT) systems. The exhaust valve control solenoid is responsible for controlling the position of the exhaust valves, optimizing engine performance and emissions.

Here are some steps to help you troubleshoot and fix the P0027 fault code:

1. Check the wiring and connectors

Inspect the wiring harness and connectors connected to the exhaust valve control solenoid. Look for any signs of damage, loose connections, or corrosion. Repair or replace any faulty wiring or connectors if necessary.

2. Test the exhaust valve control solenoid

Using a multimeter, measure the resistance of the exhaust valve control solenoid. Compare the reading to the manufacturer's specifications. If the resistance is outside the recommended range, replace the solenoid.

3. Inspect the engine oil

Verify that the engine oil is clean, at the correct level, and not contaminated. Dirty or low-quality oil can cause issues with the solenoid's performance. Change the oil if needed, ensuring to use the manufacturer's recommended oil type and viscosity.

4. Test the VVT system

Perform a diagnostic test on the VVT system using a scan tool. Look for any other related fault codes or system malfunctions. If necessary, consult a professional mechanic or use manufacturer-specific diagnostic software to troubleshoot the VVT system further.

5. Check the camshaft position sensor

Verify the functionality of the camshaft position sensor. A faulty sensor can cause issues with the VVT system and trigger the P0027 fault code. Replace the sensor if required.

6. Clear the fault code and test drive

After performing the necessary repairs, use a scan tool to clear the fault code from the vehicle's computer memory. Take the car for a test drive and monitor for any recurrence of the fault code.

If the P0027 fault code persists after attempting these steps, it is recommended to seek assistance from a qualified mechanic to perform further diagnosis and repair.