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P0819 is a diagnostic trouble code (DTC) for "Up and Down Shift Switch to Transmission Range Correlation". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
A P0819 trouble code is related to a vehicle’s automatic transmission and its up- and down-shift functions, frequently referred to as “manual mode.”
P0819 is an OBD-II generic code for a voltage/resistance problem with the transmission’s up- and down-shift switch. When the engine computer detects voltage or resistance from the transmission range correlation circuit (the switch, wiring, connectors, and mode actuator), it will illuminate a check engine light and, depending on make and model, disable the manual shifting functions of the transmission.
The most common causes for a P0819 are:
Symptoms will depend on the make and model of your vehicle, but typical issues are disabled use of the up- and down-shift functions. Some vehicles may enter “limp-mode” that limit high rpm shifting.
Your mechanic will typically start with a visual inspection of the up- and down-shift switch itself. Locations may vary between manufacturers, but for the most part, the switch is located underneath the center console. If any wiring or electrical connectors look dirty or damaged, they should be repaired or replaced. If it appears the switch itself is damaged, your mechanic will replace the switch and test drive the vehicle.
The electrical connectors for the switch can be damaged from spilled liquid such as beverages stored in the cupholders. When this happens, it can cause a P0819 when the switch is still in working order. While rare, the condition of the connectors should not be overlooked.
Because most automakers will not let a P0819 trigger “limp-mode,” the code typically isn’t that serious of an issue. The transmission should shift as it should in normal drive mode. If “limp-mode” is activated, this can hinder driving from a lack of performance.
The most common repairs for a P0819 are as follows:
While rare, the number of P0819 issues may soon increase as more and more modern vehicles offer automatic transmissions with manual shift modes.
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