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1999 Dodge Durango P0505 Code: Check Engine Light On, Idle Unstable After IAC Replacement

Model: 99 Durango Fault Code: P0505 Posted: 2014-08-19 20:13

The check engine light is on in my 1999 Dodge Durango with a 5.9L V8 engine, and the idle speed fluctuates significantly. I replaced the Idle Air Control (IAC) valve and performed a reset, but the P0505 code persists. The vehicle exhibits rough idling and inconsistent performance. What could be causing this issue? Any guidance on diagnosing or fixing the P0505 idle air control circuit fault?

Related fault codes
P0505
Comments (1)
Anonymous 2014-08-20 10:54

The P0505 code specifically indicates an issue with the Idle Air Control (IAC) motor circuit, not a replacement requirement. To troubleshoot this, you'll need a digital multimeter (DVOM) and the correct wiring diagram for your 1999 Dodge Durango. If I develop a simple DIY diagnostic guide, I will share it later.