Skip the auto shop - Our mechanics make house calls

P0827 OBD-II Trouble Code: Up and Down Shift Switch Input Circuit Low

diagnostic check engine light

P0827 code definition

The P0827 trouble code detects an electrical issue with the up and down shift switch circuit.

What the P0827 code means

The P0827 code is a generic OBD-II trouble code that notes an electrical problem with the upshift/downshift switch circuit, which contains the upshift/downshift switch, the mode actuator, and many electrical components. The upshift/downshift switch is used by the driver to control gears and shifting in an automatic transmission that has manual mode. When the powertrain control module (PCM) notes that the upshift/downshift switch circuit is producing an abnormal voltage or resistance signal, the P0827 trouble code will be detected.

What causes the P0827 code?

The P0827 trouble code is most frequently caused by damage to the upshift/downshift switch, which is located in the cabin of the vehicle, usually on the shifter, but sometimes on the steering wheel or column. This damage is usually the result of spilled liquids. Damaged electrical components (such as the wires and connectors) in the system can also trigger the P0827 code.

What are the symptoms of the P0827 code?

When the P0827 trouble code is detected, the check engine soon warning light will likely illuminate on the instrument cluster, though not always. It is common for the overdrive light to flash as well. As far as drivability is concerned, the manual mode in the automatic transmission will be disarmed, and the transmission may enter “limp-in” mode, which will impact the smoothness of the shifting.

How does a mechanic diagnose the P0827 code?

The P0827 code will be diagnosed using a standard OBD-II trouble code scanner. A professional technician will use the scanner to observe the freeze frame data, to gather information about the code. The mechanic will also check to see if additional trouble codes are present. If there are multiple codes, then they should be addressed in the order in which they appear on the scanner. The mechanic will then reset the trouble codes, restart the vehicle, and check to see if the code remains detected. If it does not, then the code was likely triggered erroneously, or represents an intermittent issue.

If the P0827 trouble code remains detected, then the mechanic should undergo a visual inspection of the electronical components in the automatic transmission. Any open or shorted wires, or damaged or corroded connectors should be replaced (it is also common for the entire electrical harness to be replaced). Next, the upshift/downshift switch will need to be carefully inspected, and quite likely replaced.

If the problem has not been found, the reference voltage and ground signals should be checked, and a digital volt/ohmmeter can be used to test for resistance and continuity between all the circuits.

After any component is replaced, the mechanic will reset the trouble codes, restart the vehicle, and once again check to see if the codes return. By doing this, the technician will be able to identify as soon as the issue has been resolved.

Common mistakes when diagnosing the P0827 code

The mistake that is made most often when diagnosing the P0827 code is the failure to properly comply with the OBD-II trouble code diagnosis protocol. Technicians should abide by the protocol step by step, at all times, to guarantee that every repair is both thorough and efficient.

It is fairly common for damaged switches to go unnoticed, because liquid spills do not always leave physical signs of damage.

How serious is the P0827 code?

A vehicle with a detected P0827 trouble code will still be drivable, though the manual shift mode may be deactivated, and shifting may be a little harsh. If this code is not resolved, further damage can occur to the transmission, so the P0827 code should be addressed as soon as it is detected.

What repairs can fix the P0827 code?

The most common repairs for the P0827 code are a replacement of the upshift/downshift switch, and replacement of the electrical components. In very rare cases, the PCM may need to be replaced.

Additional comments for consideration regarding the P0827 code

The P0827 trouble code only applies to vehicles that have automatic transmissions with manual shift mode.

Need help with a P0827 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...


Related questions

Q: 2009 Nissan Murano has the P0420 trouble code. It says the normal bank 1 issue, but now it says short to VBAT. What is that and how to fix it?

Hi there. From the description you have provided, for your vehicle's P0420 trouble code. I suspect the O2 (Oxygen) sensor you replaced has created an additional concern for your vehicle. Either, the O2 sensor is incorrect by application or is...

Q: Do all cars have an OBD system?

Virtually all vehicles from the 1987 model year to the present day have an OBD system. Some earlier model year vehicles, but not all, have some semblance of an OBD system. However, their diagnostic abilities are severely limited. There are...

Q: Wont start sometimes

The problem may be from the fuel pump or regulator or one of the sensors. You should have a Check Engine Light that can be scanned and diagnosed to see what may be causing the problem. I recommend having a...