Wrench light The wrench light comes on and says there is a powertrain fault has been detected

That means service period is due. Take it to your dealership or registered mechanic for service.

You may want to have faults read out of the powertrain control module. The wrench light generally means a transmission fault. If it does not come back it may not be a cause for alarm. However, if it lights up often while driving or permanently, you may want to get a mechanic to check into the cause of the light illuminating.

Wrench Warning Indicator (Base Instrument Cluster)
The instrument cluster receives the powertrain status from the PCM over the HS-CAN. When a powertrain system concern is detected, the PCM sends the instrument cluster a command signal to illuminate the wrench warning indicator. If the 4WD control module detects a failure with the 4WD drive system, the 4WD control module sends a message to the instrument cluster over the CAN to illuminate the wrench warning indicator. On 4.6L engines, if the transmission control module (TCM) detects a failure with the transmission, the TCM sends a message to the instrument cluster over the CAN to illuminate the wrench warning indicator.

It means a trip to the dealer or some other qualified repair shop .

Powertrain Malfunction (Wrench) Warning Indicator (base instrument cluster)
The instrument cluster receives the powertrain status from the PCM over the high speed CAN. When a powertrain system concern is detected, the PCM sends the instrument cluster a command signal to illuminate the powertrain malfunction (wrench) warning indicator. If the 4WD control module detects a failure with the 4WD drive system, the 4WD control module sends a message to the instrument cluster over the CAN to illuminate the powertrain malfunction (wrench) warning indicator. On 4.6L engines, if the transmission control module (TCM) detects a failure with the transmission, the TCM sends a message to the instrument cluster over the CAN to illuminate the powertrain malfunction (wrench) warning indicator.
better have it checked !
Bett

The Wrench Symbol is the Powertrain malfunction indicator: When this symbol comes on it means that the powertrain control module (PCM for short) has detected a problem in the powertrain (engine, transmission AWD), in you case it seems to be the engine that has problem. The number of problems that turns this light on is not cut and dry, it can be any number of things that have malfunctioned. What must be done now is to the the system scanned for fault codes, a fault code or codes is stored for the problem when this light came on or in your case comes on. It is likely this problem is covered under the emission system warranty if you have less than 70,000 miles on the truck.

Meintanance required, maybe a full tune up?

Hello. this is a warning indicator. this light is on because there is either a problem with the engine control system, or even possiblity the abs unit. you will need to have the vehicle scanned for trouble codes to see why this light is coming on.

The SERVICE (Wrench) telltale is pulled to ground by the powertrain control module (PCM). When the lamp is pulled to ground, current from the ignition circuit flows through the indicator lamp, allowing it to come ON. The PCM will turn the SERVICE (Wrench) telltale ON for all non-emission related DTCs that require that a telltale be turned ON (some DTCs do not turn on a telltale but are stored to aid in diagnosis).
The SERVICE (Wrench) telltale will also be turned ON if the ABS control module has detected a fault in its own warning indicator system. If the ABS system cannot turn on its own telltale, a message will be sent to the PCM through the class 2 data bus (circuit 1807) to turn on the SERVICE (Wrench) telltale.
The SERVICE (Wrench) telltale will be turned ON for 2-3 seconds when the ignition is turned to RUN for a bulb test.

Throttle Control/Transmission (Picture Of Wrench):
Illuminates when a powertrain fault
or an AWD fault (if equipped) has
been detected. Contact your dealer
as soon as possible.

from the manual:

Throttle Control/Transmission:
Illuminates when a powertrain fault
or an AWD fault (if equipped) has
been detected. Contact your
authorized dealer as soon as possible.

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Throttle Control/Transmission:
Illuminates when a powertrain fault
has been detected. Contact your
authorized dealer as soon as
possible
This is from the owners manual