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 pins.
The cost to diagnose the P1661 Buick code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
With the engine speed over 600 rpm, the Powertrain Control Module (PCM) detects that the Actual and Commanded state of the MIL Control circuit did not match, condition met for over 5 seconds.
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Get the P1661 Buick code diagnosed by a professional: Find a repair shop in your area