P1520high severityPowertrain
Camshaft Position Actuator Bank 1 Tight
on 1999 BMW 540iT E39 4.4L V8 · RWD
What this code means
The DME detected that the intake camshaft position actuator (VANOS unit) on Bank 1 is mechanically tight or seized. The VANOS unit is not moving freely within its expected range.
Symptoms
- Check Engine Light
- VANOS rattle on startup
- Loss of power at low RPM
- Rough idle
- Poor throttle response
Common causes
- Worn VANOS unit seals
- Sludge buildup in VANOS unit
- Failing VANOS solenoid
- Low oil pressure to VANOS
- VANOS piston ring wear
Diagnostic steps
- Listen for VANOS rattle at cold start
- Check engine oil level and condition
- Monitor VANOS position with scan tool
- Test VANOS solenoid
- Measure oil pressure
Repair notes
Rebuild or replace the VANOS unit on Bank 1; ensure oil is clean and at proper level.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1