Idle Speed Control Error
1995-1999 BMW 318ti E36 1.9L I4 🇨🇦
Description
The DME detected that the engine idle speed is outside the acceptable range and cannot be corrected by the idle speed control system. The engine speed deviates from the target idle RPM by more than the allowable margin.
Symptoms
- Rough or unstable idle
- Idle speed too high or too low
- Engine stalling
- Check Engine Light
Common Causes
- Vacuum leak
- Dirty throttle body
- Faulty idle air control valve
- Incorrect base idle setting
- Air intake leak after MAF sensor
Diagnostic Steps
- Check for vacuum leaks with smoke machine
- Clean throttle body
- Test idle air control valve
- Perform idle adaptation with scan tool
- Check intake system for leaks
Repair Notes
Repair vacuum leaks and clean throttle body; perform idle speed adaptation.
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
P1550 on Other Vehicles
Common Questions
What does code P1550 mean on a 1995-1999 BMW 318ti E36?
P1550 stands for "Idle Speed Control Error". The DME detected that the engine idle speed is outside the acceptable range and cannot be corrected by the idle speed control system. The engine speed deviates from the target idle RPM by more than the allowable margin.
What are the symptoms of P1550 on a BMW 318ti E36?
Common symptoms of P1550 include: Rough or unstable idle, Idle speed too high or too low, Engine stalling, Check Engine Light.
What causes P1550 on a 1995-1999 BMW 318ti E36?
Common causes of P1550 include: Vacuum leak, Dirty throttle body, Faulty idle air control valve, Incorrect base idle setting, Air intake leak after MAF sensor.