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P0028 — Intake Valve Control Solenoid Circuit Rangeperformance Bank 2

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

P0028 indicates that the powertrain control module has detected the intake valve timing control solenoid circuit on bank 2 is operating outside its expected electrical or performance range. This system adjusts intake camshaft timing for improved efficiency and power, and the code points to the circuit, control solenoid, or related oil pressure/flow rather than the camshaft itself.

Symptoms

What causes it — most likely first

1. Faulty intake valve timing control solenoid (bank 2)

The solenoid can fail electrically or mechanically, causing out-of-range circuit feedback or improper valve operation. This is the most common root cause for P0028.

2. Low or degraded engine oil / incorrect viscosity

The VVT system depends on adequate oil pressure and flow; dirty oil, low level, or wrong viscosity can prevent the solenoid from performing within range.

3. Wiring, connector, or fuse issue in the solenoid circuit

Corroded pins, chafed wiring, loose connectors, or an open fuse can cause the PCM to see an out-of-range signal without the solenoid itself being bad.

4. Clogged oil passages or VVT filter screens

Sludge or debris blocking oil flow to the solenoid or camshaft phaser can produce a range/performance fault even when the solenoid tests electrically fine.

5. Stuck or mechanically failed bank 2 camshaft phaser

If the phaser cannot move as commanded, the PCM may interpret the resulting solenoid feedback as a circuit range/performance problem.

6. Faulty powertrain control module (PCM)

A PCM driver circuit failure is rare and should only be considered after all wiring, solenoid, oil, and mechanical components are verified.

How it's diagnosed

  1. Check engine oil level and condition; confirm the correct viscosity and change interval before proceeding.
  2. Inspect the bank 2 intake VVT solenoid connector and wiring for corrosion, looseness, chafing, or melted insulation; verify fuse integrity.
  3. With the solenoid disconnected, measure coil resistance and compare to specification; check for open or shorted windings.
  4. Command the solenoid with a scan tool while monitoring camshaft position and oil pressure response; listen for audible clicking.
  5. Remove the bank 2 intake VVT solenoid and inspect its screen for sludge or debris; clean or replace as warranted.
  6. If all electrical and oil-flow checks pass but the code persists, evaluate the camshaft phaser mechanically before considering the PCM.

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

Can I drive with a P0028 code?

Short distances are usually possible, but continued driving can cause poor performance, increased emissions, and potential catalyst damage if the engine runs poorly. Have it diagnosed promptly.

Will an oil change fix P0028?

Sometimes. If the oil is dirty, low, or the wrong viscosity, correcting that can resolve the code. However, if the solenoid, wiring, or phaser is faulty, an oil change alone will not fix it.

Should I replace the PCM for P0028?

No. PCM failure is rarely the cause of P0028. The solenoid, oil condition, wiring, and mechanical phaser should all be verified first; replacing the PCM is a last resort and is usually unnecessary.

Is P0028 the same as a camshaft sensor code?

No. P0028 relates to the intake valve timing control solenoid circuit on bank 2, not the camshaft position sensor itself, though both systems interact and camshaft position data is used to evaluate solenoid performance.