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Summary
  • The P0935 code stands for “Hydraulic Pressure Sensor High.”
  • This code is set when the hydraulic pressure sensor sends an improbable pressure reading.
  • Some common causes include a failing hydraulic pressure sensor, faulty hydraulic pressure sensor wiring, or PCM/TCM failure.
  • Three symptoms to look out for are an illuminated check engine light, shifting troubles, and if the vehicle is stuck in limp mode.

The hydraulic pressure sensor sends information to the powertrain control module (PCM) about the amount of hydraulic pressure present in the vehicle’s transmission. If your vehicle’s hydraulic pressure sensor is faulty, it can trigger diagnostic trouble codes (DTCs) like the P0935.

What Does the P0935 Code Mean?

Diagnostic trouble code P0935 stands for Hydraulic Pressure Sensor High. This code triggers when the hydraulic pressure sensor sends a hydraulic line pressure reading that shouldn’t be plausible.

obd scan tool screen
The P0935 code is triggered when the hydraulic pressure sensor sends a hydraulic line pressure reading that shouldn’t be plausible.

The PCM uses the transmission’s pressure control solenoids to regulate the amount of pressure in the hydraulic lines. The PCM checks if the hydraulic pressure sensor’s readings are meeting its desired line pressure, which is determined by the PCM based on readings from other transmission and engine sensors. The desired line pressure can vary depending on factors such as driver demand and engine and transmission load.

Note: The definition of code P0935 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0935 Code?

The P0935 code might be caused by the following:

  • Failed hydraulic pressure sensor
  • Faulty hydraulic pressure sensor wiring
  • PCM or TCM failure

What are the Common Symptoms of the P0935 Code?

Your vehicle might show the following symptoms if the P0935 code is stored:

female driver in a car
One of the common symptoms of the P0935 code is a vehicle stuck in limp mode.

How to Diagnose the P0935 Code

The P0935 is a generic powertrain code that can be stored in most modern vehicles. Remember that diagnosing this trouble code can vary depending on vehicle specifications.

The diagnostic process might require a visual inspection of the concerned parts, such as the wiring between the pressure sensor and PCM. This task can be difficult if you aren’t familiar with your vehicle’s internal components. The hydraulic pressure sensor itself might need to be tested, which requires the right tools. We recommend asking a trained mechanic to do the job for you. However, you can also do it yourself if you’re confident in your DIY skills.

How to Fix the P0935 Code

First do a proper diagnosis before you start any repair process. Accurately diagnosing the issue that’s triggering the code is important. Otherwise, you might be fixing a part that’s working properly.

There are many ways to fix a specific OBD-II code’s underlying issues because there are many possible causes. Once you’ve identified the issues causing the trouble code, then you can consult reliable online auto repair resources and how-to guides for possible fixes.

Since all vehicles are different, a fix for an OBD-II code for one vehicle might not work for another. Internal components can vary greatly among manufacturers. This is why you should consult a repair manual or repair database when it comes to troubleshooting and repairing DTCs. Chilton repair manuals can be useful. An ALLDATA DIY subscription might be better, as it provides detailed factory repair information for drivers who want to do the repairs themselves.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at CarParts.com

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

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.

File Under : OBD-II Trouble Codes
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