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P0026 — Intake Valve Control Solenoid Circuit Rangeperformance Bank 1

Generic OBD-II · all makesPowertrain (engine & transmission)

P0026 indicates the engine control module (PCM) has detected an electrical issue with the intake valve control solenoid circuit for Bank 1. This typically means the signal is outside the expected range, either too high, too low, or unresponsive, affecting variable valve timing or lift control.

Symptoms

What causes it — most likely first

1. Faulty intake valve control solenoid

The solenoid itself may be internally shorted, open, or mechanically stuck, preventing proper operation and causing an out-of-range signal.

2. Wiring or connector issues in the solenoid circuit

Damaged, corroded, or loose wiring or connectors between the solenoid and PCM can cause voltage drops, shorts, or open circuits, leading to the code.

3. Low or dirty engine oil

Variable valve timing systems often rely on clean, properly pressurized oil. Low oil level or degraded oil can prevent the solenoid from functioning correctly.

4. Oil control valve or phaser mechanical failure

Internal wear or blockage in the oil control valve or cam phaser can cause improper operation, which may trigger the solenoid circuit code.

5. PCM software or calibration issue (rare)

In rare cases, a software glitch or incorrect calibration in the PCM may incorrectly interpret the solenoid signal, though this is uncommon.

6. Faulty PCM (extremely rare)

A defective PCM causing this code is highly unlikely. Only consider this after all other causes have been thoroughly ruled out.

How it's diagnosed

  1. Retrieve and document all stored trouble codes and freeze frame data using an OBD-II scanner.
  2. Visually inspect the intake valve control solenoid and its wiring harness for damage, corrosion, or loose connections. Repair or replace as needed.
  3. Check engine oil level and condition. Verify it meets the manufacturer’s specifications for type and viscosity. Top off or replace if necessary.
  4. Using a digital multimeter, test the solenoid’s resistance and compare it to the manufacturer’s specifications. Replace the solenoid if out of range.
  5. Test the solenoid’s control circuit for proper voltage and ground signals from the PCM during key-on and engine-running conditions.
  6. If all electrical tests pass, inspect the oil control valve and cam phaser for mechanical issues or blockages. Replace components if faulty.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationSAE generic — identical on every make
Related codesP0020 — Camshaft Position Actuator Control CirP0021 — Camshaft Position Timing Over AdvancP0022 — Camshaft Position Timing Over RetardP0023 — B Camshaft Position Actuator Control CP0024 — B Camshaft Position Timing Over AdvaP0025 — B Camshaft Position Timing Over Reta

Frequently asked

Is the PCM usually the cause of P0026?

No. While the PCM monitors the circuit, it is rarely the root cause of P0026. The issue is almost always due to the solenoid, wiring, oil condition, or mechanical components. Replacing the PCM should only be considered as a last resort after all other possibilities are exhausted.

Can I drive with a P0026 code?

Driving with this code may result in reduced engine performance, poor fuel economy, or increased emissions. While the vehicle may still be drivable, prolonged operation could lead to further damage, especially if the issue affects oil flow or valve timing.

Will changing the oil fix P0026?

If the code is caused by low or degraded engine oil, changing the oil and filter may resolve the issue. However, if the problem is electrical or mechanical (e.g., faulty solenoid or wiring), an oil change alone will not fix it.

How do I know if the solenoid or the wiring is the problem?

Testing the solenoid’s resistance and checking for proper voltage/ground signals at the connector can help isolate the issue. If the solenoid tests within specifications but the circuit still fails, the wiring or PCM output is likely the problem.