If it were me, I'd start with disconnecting the battery for a few minutes and then reconnecting it. It won't hurt anything and it's the simplest thing to do. Good luck.
This if from the factory service manual
Powertrain Malfunction (Wrench)/Service Warning Indicator
The powertrain malfunction (wrench)/service warning indicator is used to inform the driver that an oil change is required and to inform the driver if a powertrain fault is present in the PCM or TCM .
For powertrain faults, the IPC uses 2 messaged inputs to control the powertrain malfunction (wrench) indicator. The IPC receives the engine warning indication message from the PCM over the HS-CAN . The second input is the transmission fault indication message, sent to the IPC over the HS-CAN from the TCM . When a fault occurs in the Electronic Throttle Control (ETC) or the transmission, the PCM or TCM sends a message to the IPC to illuminate the powertrain malfunction (wrench) indicator.
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