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P0826 is a diagnostic trouble code (DTC) for "Up and Down Switch Input Circuit". 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 P0826 trouble code indicates a problem in the electrical circuit of the upshift/downshift switch to the transmission range correlation circuit. This circuit includes the switch, wiring, connectors, and mode actuator, and is used on vehicles that have manually shiftable automatic transmissions. Related codes include P0827 and P0828.
When the powertrain control module (PCM) detects a variance in the voltage from the upshift/downshift switch circuit that doesn't match the variance as outlined in the manufacturer's specifications, a P0826 trouble code is stored and the check engine light illuminates. The mechanic should keep in mind that some vehicles require multiple failure cycles in order for the check engine light to come on, while the check engine light in some vehicles does not illuminate at all.
In addition to shorted, disconnected, or otherwise faulty wiring and connectors, a P0826 trouble code is most commonly caused by liquids spilled on the upshift/downshift switch.
The most common symptom of a P0826 trouble code is a disabled manual shifter. Another common indicator of a P0826 trouble code is for the transmission control module (TCM) to place the transmission in Limp-in mode, leading to harsh shifting on the part of the transmission and the inability of the torque converter to operate properly. In addition, when a P0826 trouble code is stored, the overdrive light might also flash.
Diagnosing a P0826 trouble code requires a mechanic to have an advanced scanner, digital volt/ohmmeter, and the manufacturer's wiring diagram for the vehicle in question on hand. The mechanic must also perform the following:
A common mistake made when diagnosing a P0826 trouble code is for the mechanic to overlook spilled liquid on the upshift/downshift switch as the cause of the problem and instead erroneously focus on faulty transmission wiring as the source of the problems causing the code storage.
While you can drive with a stored P0826 trouble code, the transmission problems caused by the issues that cause this code can make it more difficult, if not impossible, to drive a vehicle.
To repair a P0826 trouble code the mechanic must do the following:
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