P0935 - Hydraulic Pressure Sensor Circuit High

P0935 – OBD-II Trouble Code Technical Description

High signal level in the hydraulic pressure sensor circuit

What does the fault code mean P0935?

There may be times when your vehicle's OBD codes will flash and your check engine light may come on. To deal with these error codes, you need to check the symptoms and make a proper diagnosis. P0935 is issued by the TCM when it notices abnormal signals from the hydraulic pressure sensor.

Your vehicle's hydraulic pressure is used by the clutch to engage and disengage the various gears needed while driving. This pressure is stored in the accumulator, and the accumulator pressure sensor sends information to the transmission control module about how much pressure is present in the system. If the signal sent back to the TCM is unacceptable, a P0935 code is stored.

The hydraulic pressure sensor is an important part of the transmission that helps the ECU decide how to shift gears. If an unusually high signal is detected in the hydraulic pressure sensor/line pressure sensor circuit, DTC P0935 will be set.

Possible reasons

What causes a high signal problem in the hydraulic pressure sensor circuit?

• The hydraulic pressure sensor has an open or shorted wiring harness.
• The hydraulic pressure sensor circuit shows a poor electrical connection.
• Damaged wiring and/or connectors.
• Faulty fuses.
• The pressure sensor in the gearbox is faulty.

What are the symptoms of a fault code? P0935?

Our main goal is to achieve customer satisfaction, so we will help you diagnose the P0935 code by highlighting some of the main symptoms below:

• Low fuel efficiency
• Gear shift problem
• Unusually harsh gear shifting at low speeds
• Unusually smooth gear shifting at high revs
• Less acceleration (if gear starts in 1st instead of 2nd)
• Unusually high rpm at speed (because the ECU has told the transmission not to upshift)

How to diagnose a fault code P0935?

To properly diagnose a P0935 OBDII trouble code, your mechanic must first check the condition of the wiring and connectors in the transmission pressure sensor circuit, as well as the associated fuses and relays. If nothing is found, you should check the hydraulic pressure sensor/line pressure sensor itself, as well as the ECU and TCM. Perform the following diagnostic steps to resolve the P0935 code:

• Start with a general check of the wiring harnesses for damage, shorts, and other physical problems. Pay attention to the condition of the connectors and contacts, and make sure they are connected correctly.
• Use a DMM and EWD (electrical wiring diagram) to check the voltage and ground in the pressure sensor circuit. Make sure the voltage matches your vehicle's specifications.
• Measure the LPS supply voltage at 5 V and the ground at 0 V. There should be AC ​​voltage present on the signal line. If you find a discrepancy, check the circuit for an open circuit on the ground.
• Disconnect the LPS and measure the 5V reference, 0V signal, and ground. If you find a discrepancy, trace the circuit to find the short to power.
• Turn the ignition key off and disconnect the ECM and LPS. Check the circuits end to end for resistance and proper connections to ground.

By following these steps, you will be able to diagnose and repair the P0935 code problem.

Diagnostic errors

When diagnosing car problems, various errors may occur. Some of the common errors that may occur when diagnosing a vehicle include:

1. Incorrect use of diagnostic equipment: Using inappropriate or outdated diagnostic equipment may lead to incorrect conclusions and misdiagnosis of the problem.
2. Lack of Attention to Detail: Failure to attend to the smallest details or miss important points can lead to missing key information and misidentifying the root of the problem.
3. Misinterpretation of error codes: Improper understanding or interpretation of vehicle error codes can lead to incorrect diagnosis and, as a result, incorrect repairs.
4. Neglecting a Visual Inspection: Skipping a visual inspection of important vehicle components can result in obvious problems such as worn or damaged parts being missed.
5. Failure to maintain regular maintenance: Insufficient or improper regular maintenance of your vehicle can lead to problems that can be prevented in advance.
6. Inadequacy of Diagnostic Experience: Inadequacy of a mechanic's or diagnostic technician's experience and knowledge of a particular problem can lead to misdiagnosis and incorrect decisions.
7. Not taking into account external factors: Some car problems can be caused by external factors, such as adverse operating conditions or the environment, and should be taken into account when diagnosing.

To avoid these mistakes, it is important to have a good understanding of how automotive systems work, use the correct diagnostic equipment and techniques, and contact experienced technicians when necessary.

How serious is the fault code? P0935?

Trouble code P0935 indicates a problem with the vehicle's transmission hydraulic pressure system. This code indicates that there is excessive voltage in the transmission pressure sensor circuit. Depending on the specific circumstances and characteristics of your vehicle, the severity of the problem may vary.

If you have a P0935 code, it is recommended that you take it to a qualified auto mechanic for diagnosis and repair. Although this code itself is not a critical failure, it does indicate problems in an important vehicle system that can lead to poor shifting and other negative consequences.

Ignoring the problem associated with the P0935 code can lead to further deterioration of the transmission and other related vehicle systems. Therefore, it is recommended to immediately contact a specialist to diagnose and fix the problem.

Overall, it is important to take error codes seriously and resolve them as soon as possible to avoid further damage and keep your vehicle functioning properly.

What repair will help eliminate the code? P0935?

To resolve the P0935 trouble code, you must perform diagnostics to determine the specific cause of the problem. Depending on the identified cause, repairs may include the following measures:

1. Check and replace wiring and connectors: If the problem is with the wiring or connectors, they should be checked for damage, corrosion, short circuits and replaced if necessary.
2. Replacing the Hydraulic Pressure Sensor: If the hydraulic pressure sensor is faulty, it must be replaced with a new one to restore proper operation of the system.
3. Checking and replacing fuses and relays: If the cause is faulty fuses or relays, they must be checked and replaced with working units.
4. Transmission Control Module (TCM) Test and Rebuild: If the problem is a faulty TCM, the unit may need to be professionally diagnosed and rebuilt.
5. Repair or replace the hydraulic unit: If the hydraulic unit fails, it must be repaired or replaced to restore normal functioning of the system.

When making repairs, contact a qualified auto mechanic or service center, especially if the repair involves complex mechanisms or electronic systems. Diagnosis must be carried out carefully and thoroughly to eliminate the possibility of further problems and confidently resolve the P0935 trouble code.

What is P0935 Engine Code [Quick Guide]

P0935 – Brand-specific information

Of course, here are the P0935 codes for some specific car brands:

1. Ford: P0935 – Hydraulic Pressure Sensor Circuit High Input
2. Chevrolet: P0935 – Hydraulic Pressure Sensor Circuit
3. Toyota: P0935 – Hydraulic Pressure Sensor Circuit
4. Honda: P0935 – Hydraulic Pressure Sensor Circuit
5. BMW: P0935 – Hydraulic Pressure Sensor Circuit Range/Performance
6. Mercedes-Benz: P0935 – Hydraulic Pressure Sensor Circuit
7. Audi: P0935 – Hydraulic Pressure Sensor Circuit

Please note that these are just examples, and the explanations may vary depending on the specific model and year of manufacture of the car. For more accurate information, consult your owner's manual or your vehicle's specifications.