What Does P0935 Mean?
DTC P0935 indicates the hydraulic pressure sensor circuit is producing a voltage signal above the maximum expected threshold. The PCM/TCM interprets this as an abnormally high pressure reading, which may be caused by a sensor fault, open ground circuit, or wiring issue. This code is the high-input counterpart to P0934 and suggests the sensor signal is railed high rather than reflecting actual hydraulic pressure.
Common Causes
30%
Faulty hydraulic pressure sensor (open circuit or internal failure)
25%
Open or broken ground wire in the sensor circuit
20%
Signal wire shorted to voltage source (battery or 5V reference)
15%
Corroded or disconnected sensor connector
10%
TCM internal reference voltage fault
Diagnostic Steps
1
Step 1: Inspect the hydraulic pressure sensor connector for corrosion, disconnection, or damaged pins. An open ground circuit will cause the signal to read high.
2
Step 2: Using a multimeter, measure the sensor signal voltage at the TCM connector with the key on. A reading near 5V (reference voltage) suggests an open sensor or ground circuit.
3
Step 3: Check continuity of the ground wire from the sensor connector back to the TCM or chassis ground point. Repair any open circuits found.
4
Step 4: Verify the signal wire is not chafed or shorted to a nearby power wire. Inspect the routing of the harness for damage points.
5
Step 5: If all wiring checks pass, replace the hydraulic pressure sensor. Clear codes and test drive to verify the signal returns to normal operating range.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
DTC P0935 indicates the hydraulic pressure sensor circuit is producing a voltage signal above the maximum expected threshold. The PCM/TCM interprets this as an abnormally high pressure reading, which may be caused by a sensor fault, open ground circuit, or wiring issue. This code is the high-input c...
The most common cause of P0935 (Hydraulic Pressure Sensor Circuit High Input) is: Faulty hydraulic pressure sensor (open circuit or internal failure)
Typical repair costs for P0935 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A falsely high pressure reading may cause the TCM to make incorrect shift decisions, potentially leading to harsh shifts, clutch slippage, or transmission limp mode. The vehicle should be diagnosed promptly to prevent drivetrain damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0935 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission / Clutch Hydraulic System
Difficulty
Type
Generic (SAE)
Recommended Tools
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