P1525high severityPowertrain
Variable Valve Timing Actuator Supply Voltage
on 1997 BMW 318ti E36 1.9L I4 M44 · RWD
What this code means
The DME detected that the supply voltage to the VANOS actuator system is out of specification. Proper voltage is critical for the precise electro-hydraulic control of variable valve timing.
Symptoms
- Check Engine Light
- VANOS not operating correctly
- Power loss at various RPMs
- Rough idle
- Poor throttle response
Common causes
- Low battery voltage
- Corroded wiring or connectors in VANOS circuit
- Faulty VANOS solenoid coil
- DME power supply issue
- High resistance in power feed
Diagnostic steps
- Test battery voltage and alternator output
- Measure voltage at VANOS solenoid connector
- Inspect wiring for corrosion or damage
- Test VANOS solenoid coil resistance
- Check DME power supply circuits
Repair notes
Repair the voltage supply issue to the VANOS actuator system.
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