Audi
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Closed throttle position (CTP) switch - does not close
Cause:
    Throttle cable/valve, wiring open circuit/ short to positive, CTP switch adjustment/defective, ECM

Ford
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle Air Control System at Adaptive Clip Conditions
Cause:
    Engine running for 1 minute, then the PCM detected that the idle speed was more than the value stored in memory for its calibration.

Honda
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Positive crankcase ventilation (PCV) - air leak
Cause:
    Hose leak/blockage, PCV system, throttle body

Hyundai
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) valve - opening coil circuit - open circuit
Cause:
    Wiring, IAC valve

Kia
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) valve - opening coil signal low
Cause:
    Wiring open/short to ground, IAC valve, ECM

Mazda
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) system
Cause:
    Wiring, IAC valve, mechanical fault, ECM

Subaru
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air (IAC) control valve - voltage high
Cause:
    Wiring, IAC valve, ECM

Volkswagen
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Closed throttle position (CTP) switch - does not close
Cause:
    Throttle cable/valve, wiring open circuit/ short to positive, CTP switch adjustment/ defective, ECM