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DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0026

P0026Intake Valve Control Solenoid Circuit Range/Performance (Bank 1)

P0026 indicates that the powertrain control module (PCM) has detected an out-of-range condition in the electrical circuit for the bank 1 intake valve control solenoid, which is part of the variable valve timing (VVT) system. The computer monitors the solenoid's command signal and expected response, and it sets this code when the circuit's performance does not match the commanded state within a calibrated time or voltage window.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or intermittent misfire, especially when the engine is cold
  • Reduced engine power or sluggish acceleration due to retarded intake valve timing
  • Poor fuel economy as the PCM defaults to a fixed valve timing strategy
  • Occasional stalling or hesitation during light-throttle cruising
  • A noticeable rattle or tick from the front of the engine if the solenoid is sticking

Common causes, most likely first

  1. Dirty or contaminated engine oil clogging the solenoid's internal screen or passages
  2. Failed intake valve control solenoid (open or shorted winding, or mechanically stuck)
  3. Damaged or corroded wiring harness connector at the solenoid
  4. Open or shorted circuit in the solenoid control wire between the PCM and solenoid
  5. Restricted oil passage or low oil pressure preventing the solenoid from actuating the phaser
  6. PCM software calibration issue or internal driver fault (rare)

How to diagnose and fix it

  1. Verify oil level and condition; change oil and filter if overdue or contaminated
  2. Inspect the solenoid connector and wiring for corrosion, chafing, or loose pins
  3. Measure solenoid resistance and compare to manufacturer specification; replace if out of range
  4. Check for battery voltage at the solenoid connector with the key on and engine off
  5. Command the solenoid on and off with a scan tool and listen for a click or observe timing change
  6. Remove and clean the solenoid screen; replace the solenoid if cleaning does not restore function
  7. Clear the code and perform a road test to confirm the repair and ensure the monitor runs to completion

Oil quality and hidden circuit faults

  • A sticking solenoid caused by sludge from neglected oil changes is the most common root cause, and simply replacing the solenoid without addressing oil condition often leads to a repeat failure.
  • The code can set intermittently from a marginal electrical connection that only acts up when hot or vibrating, so a wiggle test of the harness while monitoring solenoid command is a valuable step.
  • A low oil level or a worn oil pump can reduce pressure at the phaser enough to trigger P0026 even when the solenoid itself tests good on the bench.
  • Some vehicles use the same solenoid for both intake and exhaust on bank 1, and a failure can set P0026 alongside P0027 or other VVT codes, so do not replace parts based on one code alone.
  • After repairs, the PCM may need to relearn the camshaft position; failing to clear adaptive values can cause a lingering rough idle that mimics a faulty solenoid.

Can I keep driving with P0026?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration and sustained high speeds because the engine is running on a default valve timing strategy that can increase emissions and reduce power. If the check engine light flashes or the engine runs very rough, stop driving and have it towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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