Finding out what a trouble code means is the very first step in getting it resolved. One of those codes you may encounter is P0868. This article can help you learn more about the definition, causes, and symptoms of the P0868 code.
What Does the P0868 Code Mean?
Diagnostic trouble code (DTC) P0868 code stands for “transmission fluid pressure sensor low.” This trouble code is typically triggered when the powertrain control module (PCM) detects that transmission fluid pressure is low.
The transmission has a fluid pump that provides hydraulic pressure, which is necessary for gear shifts. It’s also responsible for lubrication and cooling. Fluid pressure needs to always be maintained at a certain threshold for the transmission to work properly. If there isn’t enough transmission fluid pressure, then the transmission might not maintain the selected gear.
The PCM can change gears by directing fluid into various hydraulic passages using electronically-controlled solenoids and valves. Transmission fluid pressure is typically provided by an internal pressure pump, which is driven by the engine. When there isn’t enough pressure, then the PCM will no longer be able to change gears because there is a minimum amount of pressure required to initiate a gearshift. At the same time, pressure is also needed to keep the gear engaged.
Note: The definition of P0868 code may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
What are the Possible Causes of the P0868 Code?
As previously mentioned, the P0868 code is triggered by low transmission fluid pressure. However, it can also be caused by issues such as:
- Defective transmission fluid pressure sensor
- Damaged wiring or connectors
- Low fluid levels caused by fluid leaks
- Dirty or contaminated transmission fluid
- Defective transmission fluid temperature sensor
- Pressure pump failure
- Faulty PCM
What are the Possible Symptoms of the P0868 Code?
When the P0868 code is triggered, you’ll likely experience symptoms such as:
- Illuminated check engine light
- Gears slipping
- Transmission might not be able to switch into gear
- Transmission overheating
- Vehicle turning on limp mode
- Transmission damage
How to Diagnose the P0868 Code
After plugging in a scan tool and identifying the P0868 code, the next step is identifying the faulty part. This can be a difficult process because the transmission of most vehicles is difficult to access. You might need a lot of time and labor to be able to disassemble it for inspection. To get a proper diagnosis, you might want to consult a professional.
If you want to get a better idea of the diagnostic process, you can watch the videos below:
How to Fix the P0868 Code
Before you can conduct any repair, you need to properly diagnose the issue first. There isn’t a simple one-size-fits-all fix for any OBD-II code. The process of fixing it is going to be dependent on what’s causing the issue. After accurately identifying the cause of the issue, you can then consult online auto repair resources and how-to guides for the next steps.
Since all vehicles are designed differently, a fix that works on a vehicle from one manufacturer may not work on one from a different manufacturer. You should always consult your vehicle’s repair manual before attempting to resolve diagnostic trouble codes. Chilton repair manuals may also be useful. However, ALLDATA subscriptions are even better, as they provide detailed factory repair information for drivers who want to do repairs themselves.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.