Mercury Mountaineer flashing overdrive light and transmission hesitation issue on Mercury Mountaineer

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Mercury Mountaineer owners report experiencing issues with a flashing overdrive (OD) light and transmission hesitation, indicating potential electronic faults within the transmission system. These owners note that failing to address the flashing OD light promptly can lead to expensive mechanical damage. Additionally, some drivers experience hesitation when shifting gears, which can manifest as a pulsating feeling or bucking sensation while driving. The problems may be linked to a faulty electronic pressure control (EPC) solenoid circuit or issues with monitored sensors crucial for transmission operation. It is recommended that owners experiencing these symptoms have their vehicles inspected by a qualified mechanic to diagnose and resolve the underlying issues for safe and reliable operation.

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