P0029 indicates that the engine computer has detected the exhaust valve control solenoid circuit on Bank 2 is operating outside its expected electrical range or performance. This typically relates to variable valve lift/timing systems where an exhaust rocker arm oil control solenoid is not responding correctly.
The solenoid itself is the most common failure; internal winding resistance drifts or the valve sticks, causing out-of-range circuit feedback.
These systems rely on clean, correct-viscosity oil pressure to actuate. Dirty oil or overdue changes can cause solenoid performance codes without the part being defective.
Corrosion, chafed insulation, loose pins, or an open/high-resistance circuit can make the computer read the solenoid as out of range.
Sludge or debris blocking the feed gallery to the Bank 2 exhaust rocker arm solenoid can prevent proper actuation even when electrical function is normal.
A mechanically stuck or worn rocker arm actuator on Bank 2 can mimic a solenoid circuit/performance fault.
Rare; a driver circuit failure inside the PCM could set this code, but this is uncommon and should only be considered after all wiring, solenoid, and oil-supply checks pass.
Short distances may be okay, but prolonged driving can cause poor performance, increased emissions, and possible catalytic converter damage. Have it diagnosed reasonably soon.
No. PCM failure is rarely the cause. Shops or sources that immediately recommend a computer replacement for P0029 are usually wrong; the solenoid, oil condition, wiring, or oil passages are far more likely.
Sometimes. If the oil is old, low, or the wrong viscosity, correcting it can clear the code. If the solenoid or wiring is faulty, an oil change alone will not fix it.
It depends on the engine. Bank 2 is the side opposite Bank 1, and Bank 1 is the side containing cylinder #1. Confirm the cylinder layout for your specific engine before replacing anything.