Acura
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) system - low RPM
Cause:
    Intake system, throttle body, hose leak, wiring, IAC valve, ECM

Audi
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle speed control (ISC) - upper limit reached
Cause:
    Throttle control unit/basic setting, intake/exhaust leak, mechanical fault, AC signals

GM
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle Speed Low Conditions
Cause:
    DTC P1370, P1371, P1406, P1441 and P1442 not set, no other PCM codes set, EGR system not testing, in closed loop, ECT input from -4°F to 230-F, BARO at least 65 kPa, engine running at least 10 seconds, MAF input from 2-35 g/sec, Actual idle speed under Desired idle speed by at least 80 rpm, VSS input from 30-45 mph, throttle position stable during the test, IAC position at 100-205 counts, engine speed stable (± 75 rpm), then the PCM detected less than a 1.5 g/sec change in MAF sensor input as the IAC position was increased for 2 seconds

Honda
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) system - low RPM
Cause:
    Intake system, throttle body, hose leak, wiring, IAC valve, ECM

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

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

Jaguar
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) valve - circuit malfunction
Cause:
    Wiring open circuit, IAC valve, ECM

Kia
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) valve - closing coil signal high
Cause:
    Wiring short to positive, IAC valve, ECM

Mazda
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle air control (IAC) valve 1 - short/open circuit
Cause:
    Wiring, IAC valve, ECM

Volkswagen
Type:
    Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description:
    Idle speed control (ISC) - upper limit reached
Cause:
    Throttle control unit/basic setting, intake/exhaust leak, mechanical fault, AC signals