Skip the auto shop - Our mechanics make house calls

P0936 OBD-II Trouble Code: Hydraulic Pressure Sensor Circuit Intermittent

diagnostic check engine light

P0936 code definition

The P0936 trouble code notes an intermittent circuit error in the hydraulic pressure sensor.

What the P0936 code means

The P0936 code is a generic OBD-II trouble code that detects a problem with the hydraulic pressure sensor circuit. The purpose of the hydraulic pressure system is to provide power to help the automatic transmission shift gears. Each gear has a hydraulic circuit associated with it, and when the vehicle calls for an upshift or a downshift, the different hydraulic circuits will engage or disengage to make the shift happen. This is all controlled by the powertrain control module (PCM) and transmission control module (TCM), which calculate the proper shift strategy by accounting for various different engine factors and conditions. The PCM then monitors the hydraulic pressure by receiving data from the hydraulic pressure sensors. If the PCM receives an abnormal signal, or no signal at all from the hydraulic pressure sensors, then the P0936 trouble code may be stored.

What causes the P0936 code?

The P0936 trouble code is almost always the result of damaged electrical components. This can include blown fuses, corroded cables, short or open wires, or a loss of ground. Other potential causes of the code are a defective hydraulic pressure sensor, and a faulty PCM or TCM.

What are the symptoms of the P0936 code?

When the P0936 trouble code is detected, the check engine soon warning light will likely illuminate on the vehicle’s instrument panel. Transmission problems are usually evident, such as the failure to shift into certain gears (which can result in slow acceleration or excessive engine speed), and harsh shifting. Most vehicles will also experience reduced fuel efficiency.

How does a mechanic diagnose the P0936 code?

The P0936 code will be diagnosed with a standard OBD-II trouble code scanner. A trained technician will use the scanner to view the freeze frame data and assess the P0936 code. The scanner will also be used to check for the presence of any other trouble codes, as codes should always be addressed in the order in which they appear. The codes will then need to be reset, and the vehicle restarted, so the mechanic can see if the P0936 code returns. If it does not, then an erroneous trigger or an intermittent error are likely to blame.

If the code does return, then the mechanic will begin by visually inspecting the electrical components in the hydraulic pressure sensor system, and replacing any that are damaged. Next, the ground voltage should be checked, and then the mechanic can perform an inspection on the hydraulic pressure sensor. If no issue is found, a thorough inspection of the PCM and TCM will be required.

When any component is repaired or replaced, the mechanic will need to reset the codes, restart the vehicle, and again check to see if the P0936 code remains detected. By doing this, the technician will know when the issue is resolved.

Common mistakes when diagnosing the P0936 code?

The most commonly made mistake when diagnosing this code comes from not properly following the OBD-II diagnosis protocol. The protocol should always be followed exactly, to ensure that diagnoses and repairs are thorough and efficient.

It is fairly common for hydraulic pressure sensors to be replaced erroneously, when an electrical component was the only problem in the system.

How serious is the P0936 code?

In most cases, a vehicle with a P0936 code can still be driven, though there may be drivability issues. If the code is not addressed, severe damage can be done to the transmission, so an inspection should be scheduled as soon as the code is detected.

What repairs can fix the P0936 code?

Repairs for the P0936 trouble code are:

Additional comments for consideration regarding the P0936 code

It is very uncommon for the P0936 code to be the result of a defective PCM or TCM, so all other options should be checked before control module failure is assumed. If the PCM or TCM does need to be replaced, then a reprogramming will be required.

Need help with a P0936 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

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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.


Post a question and get free advice from our certified mechanics.


More related articles

The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...

Related questions

Q: I installed a new crankshaft positioning sensor, now I'm getting misfires and code P0300. Is this supposed to happen?

Assuming you replaced your vehicle's crankshaft position sensor for a P0335 trouble code and that code has not returned, this leads me to believe that the new sensor is either faulty or misadjusted. The sensor replacement should not have caused...

Q: OBD II monitor not ready

Hi! Your BMW has a timing element for certain functions on the Engine Control Module that can be read by the OBD II scanner. BMW has their own special scanner that resets certain things like oil change, emission inspection, and...

Q: I need help with diagnostic trouble codes that suddenly appeared making vehicle almost undriveable.

Firstly, you should have the battery disconnected and the PCM disconnected. Check their connectors for any problems and apply dielectric lube to the connectors so the connection is clean from corrosion. If the problem continues then replace the PCM. All...