Fiat P1507

OBD Codes


Description of the defect

Idle Air Control (IAC) Underspeed Error
This DTC is set when the PCM detects engine idle speed that is less than the desired rpm.

Possible causes

List of elements that might trigger the appearance of this code

  • IAC circuit open
  • IAC circuit short to PWR
  • VPWR to IAC solenoid open
  • Air inlet is plugged
  • Damaged IAC solenoid
  • Damaged PCM

Diagnostic help

Some tricks to help us for the diagnosis of the failure

The IAC solenoid resistance is from 6 to 13 ohms

Disconnect IAC valve and look for no change in engine rpm as an indication of a stuck or damaged valve
The Carbon Cleaning ?
Prevents maintenance on engine problems

Preventive engine cleaning enables you to restore engine parts rather than replacing them, thereby saving vehicle owners on costly parts, such as a new turbocharger ($ 1.350 - 3.100), catalytic converter ($ 600 - 2.000), DPF ($ 600 - 2.000) or EGR valve ($ 370 - 500).

These problems result mainly from poor combustion, which stifles the engine.

So before replacing your engine parts, try Carbon Cleaning. A dirty engine as the result of carbon deposits is the new threat to vehicle performance.

Make your online diagnosis

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