01 The 1970s Military Aircraft That Still Sees Enemies Before … • 02 People Are Shocked To Learn This “Normal” Driving Action Ca… • 03 Is Using Sport Mode All the Time Bad for the Engine or Just… • 04 This Is How Wet Brakes Or A Wet Clutch Signal Urgent Mainte… • 05 The Owner Who Drove One Car 500,000 Miles Answers The Quest… • 06 B0017 and B0018 Codes: Right Front or Passenger Frontal Dep… • 07 Power Windows: Common Problems and Solutions • 08 Understanding Car Fuel Pumps: Functions, Types, and Mainten… • 09 The Power of Cruise Control: Advantages, Considerations, an… • 10 The $30 Device That's Making Car Thieves Invisible to Police •

DTC codes / BMW codes / P1522

P1522 · BMWA Camshaft Position Actuator Bank 2

P1522 on BMW vehicles indicates that the engine control module (ECM) has detected a fault in the camshaft position actuator circuit for bank 2, which is the bank of cylinders that does not contain cylinder number one. The ECM monitors the electrical circuit that controls the variable valve timing (VVT) solenoid and sets this code when the signal is out of expected range or the actuator fails to respond to commands.

SystemPowertrain
Code typeBMW specific
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or uneven engine operation, especially when cold
  • Reduced engine power or sluggish acceleration due to incorrect camshaft timing
  • Poor fuel economy or increased emissions
  • Engine may enter limp mode, limiting RPM
  • Occasional stalling or difficulty starting

Common causes, most likely first

  1. Faulty camshaft position actuator solenoid on bank 2
  2. Wiring damage or corrosion in the actuator circuit (open, short, or high resistance)
  3. Oil sludge or debris clogging the solenoid or oil passages
  4. Failed camshaft position sensor (though less common, it can affect actuator feedback)
  5. ECM software issue or internal fault (rare)
  6. Mechanical timing chain wear affecting camshaft phasing

How to diagnose and fix it

  1. Perform a visual inspection of the bank 2 camshaft actuator solenoid and its wiring harness for damage or corrosion
  2. Use a scan tool to command the actuator on and off and observe if the camshaft timing changes as expected
  3. Measure resistance of the solenoid and compare to BMW specifications; replace if out of range
  4. Check oil quality and level; perform an oil change if sludge is suspected, as clean oil is critical for VVT operation
  5. Test the circuit with a multimeter for voltage and ground signals from the ECM; repair wiring as needed
  6. If electrical checks pass, remove the solenoid and inspect for debris; clean or replace as necessary
  7. As a last resort, diagnose mechanical timing components or ECM software with dealer-level tools

Oil quality and circuit checks before parts

  • A dirty or sludged engine oil system is a leading cause of P1522 on BMWs, so always verify oil condition and change intervals before condemning the solenoid.
  • The code can be set by a simple loose or corroded connector at the solenoid, which is often overlooked during diagnosis.
  • Bank 2 refers to the bank without cylinder 1; on inline-six engines, bank 2 is typically the rear cylinders, so confirm orientation before testing.
  • A failing camshaft position sensor can mimic actuator faults by providing incorrect feedback, so check live data for both sensors.
  • After repairs, clear the code and perform a drive cycle to ensure the actuator responds correctly; some BMW models require a relearn procedure.

Can I keep driving with P1522?

You can usually drive the vehicle with P1522, but avoid aggressive acceleration or heavy loads because incorrect camshaft timing can cause poor performance and increased emissions. If the engine runs rough or enters limp mode, seek service promptly to prevent further damage.

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 BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage