Fault code P0827 is called “Up and Down Shift Switch Circuit Low” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.
Technical description and explained code P0827
This diagnostic trouble code (DTC) is a generic transmission code. Error P0827 is considered a general code because it applies to all makes and models of vehicles. Although the specific repair steps may vary slightly from model to model.
This code applies to vehicles with automatic transmission or manual shift variator. It is set when the transmission control module detects a low signal in the up/down shifter circuit. Which works in conjunction with the transmission range correlation circuit.
The manual shift design features may be a selector lever or push-button controls on the shift selector or steering wheel. But in all cases, the system allows the driver to manually shift gears on the automatic.
Activation of the corresponding control initiates either an upshift or a downshift. The signals are transmitted to the transmission control module (TCM) via CAN (Control Area Network) protocols.
All relevant components such as the switch, wiring, connectors and mode actuator are part of the circuit. Most of which is built into either the console around the gear selector in the cabin or on or near the steering wheel.
If the PCM detects a low signal in the up/down shifter circuit, or if the circuit voltage is out of tolerance. Code P0827 may be stored and the Malfunction Indicator Light (MIL) may illuminate.
Symptoms of vehicle malfunctions
The main signal that an error P0827 has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.
It can also be warning signs such as:
- The “Check engine” control lamp on the control panel will light up (the code will be stored as a fault).
- It may be difficult to shift gears while driving.
- Unstable or abrupt shifting of gears.
- Takes a long time to change gear.
- Disabling the manual shift function.
- Transmission may be put into emergency mode.
- There may be no symptoms other than a stored fault code.
A stored P0827 code indicates that a potentially serious fault has been detected. The conditions that contributed to the stored code should be corrected as soon as possible.
Factors that can cause this error code
The error code P0827 can mean that one or more of the following problems have occurred:
- Transmission mode switch is defective.
- Faulty mode control device.
- Corrosion, breakage or short circuit in wiring or connectors.
- Poor electrical connection.
- Sometimes faulty control module is the cause.
How to fix or reset OBD-2 code P0827
Some suggested steps for troubleshooting and fix the error code P0827:
- Connect an OBD-II scanner to the vehicle’s diagnostic connector and read all stored data and error codes.
- Clear the error codes, perform a test drive, and check if the P0827 fault appears again.
- Visually inspect the electrical wires and connectors.
- If necessary, repair or replace any shorted, broken, damaged, or corroded components.
- Check the transmission mode switch.
Diagnose and repair of problems
The first thing to do when troubleshooting error P0827 is to check the electrical part for damage. In today’s vehicles, electrical and electronic signals require good cabling for proper data transmission. Any malfunctions, such as breaks, disconnected connectors or corrosion, can interrupt signals, leading to transmission control failures.
Check the battery pack, as some PCM and TCM modules are sensitive to low voltage. If the battery is low, the system may detect this as a failure. Make sure the battery is delivering at least 12 volts and that the alternator is running properly, at least 13 volts at idle.
If the car does not show a failure caused by faulty wiring, the problem is most likely caused by a worn transmission mode switch. Its replacement should solve the problem with the P0827 error. But don’t overlook fuses either, because a blown fuse is a common problem.
On which vehicles does this problem occur most frequently
Fault code P0827 can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:
- Cadillac (CTS)
- Chevrolet (Silverado)
- GMC (Sierra)
- Nissan
- Saab (9-5)
- Ssangyong
Fault code P0827 can sometimes be found with other errors. The most common are the following: P0826, P0828.
