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.”

What the P0819 code means

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.

What causes the P0819 code?

The most common causes for a P0819 are:

  • Faulty up- and down-shift switch
  • Faulty or corroded electrical connectors
  • Faulty or corroded wiring

What are the symptoms of the P0819 code?

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.

How does a mechanic diagnose the P0819 code?

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.

Common mistakes when diagnosing the P0819 code

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.

How serious is the P0819 code?

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.

What repairs can fix the P0819 code?

The most common repairs for a P0819 are as follows:

  • Replacing the up- and down-shift switch
  • Replacing electrical connectors for the switch
  • Replacing damaged wiring

Additional comments for consideration regarding the P0819 code

While rare, the number of P0819 issues may soon increase as more and more modern vehicles offer automatic transmissions with manual shift modes.

Need help with a P0819 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

This article originally appeared on YourMechanic.com as P0819 OBD-II Trouble Code: Up and Down Shift Switch to Transmission Range Correlation and was authored by Logan Utsman.


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