Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The cost of diagnosing the P1491 RAM code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
The Powertrain Control Module (PCM) has detected an open or shorted condition in the radiator fan relay circuit
With the key on or engine running, system voltage over 10v, fan relay commanded on, the Powertrain Control Module (PCM) sets the Diagnostic Trouble Code (DTC) when it detects a shorted or open condition in the relay control circuit. Test the fan relay resistance (it should be 30-70 ohms).
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