Hydraulic Pressure Sensor Circuit High
The P0935 code means the vehicle's onboard diagnostic system has detected: Hydraulic Pressure Sensor Circuit High. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $1,200 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light on
- Hydraulic pressure reads high
- Transmission may enter limp mode
- Abnormal transmission behavior
Probable Causes (Ranked by Likelihood)
- Open in hydraulic pressure sensor circuit Very High
- Contaminated or low transmission fluid High
- Wiring or connector fault in the circuit Moderate
- TCM internal failure Low
Frequently Asked Questions
What does P0935 indicate?
P0935 indicates a problem with the hydraulic pressure sensor circuit high. This is a transmission control system code that requires professional diagnosis.
Do I need a transmission rebuild?
Not necessarily. Many transmission codes are caused by solenoid failures, sensor issues, or fluid problems that can be repaired without a full rebuild.
How important is transmission fluid condition?
Very important. Contaminated or degraded fluid is a leading cause of transmission problems. It causes solenoid sticking, valve body issues, and accelerated clutch wear. Regular fluid changes can prevent many of these codes.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Use a scan tool to read Hydraulic Pressure Sensor related data
-
Check transmission fluid level, condition, and color
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Inspect the transmission wiring harness and connector for damage or corrosion
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Compare sensor readings to manufacturer specifications
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2010-2020 Ford F-150
- 2012-2019 Chevrolet Silverado
- 2011-2020 Toyota Camry
- 2009-2019 Honda Accord
Related Codes
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