Variable Valve Timing Actuator Supply Voltage
1992-1998 BMW 318i E36 1.8L I4
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1525 on Other Vehicles
Common Questions
What does code P1525 mean on a 1992-1998 BMW 318i E36?
P1525 stands for "Variable Valve Timing Actuator Supply Voltage". 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.
What are the symptoms of P1525 on a BMW 318i E36?
Common symptoms of P1525 include: Check Engine Light, VANOS not operating correctly, Power loss at various RPMs, Rough idle, Poor throttle response.
What causes P1525 on a 1992-1998 BMW 318i E36?
Common causes of P1525 include: Low battery voltage, Corroded wiring or connectors in VANOS circuit, Faulty VANOS solenoid coil, DME power supply issue, High resistance in power feed.