Faulty hydraulic pressure sensor 1, which may read high due to internal sensor degradation or contamination; Damaged or chafed wiring harness between the pressure sensor and the transmission control module, causing a short to voltage or signal interference; Corroded or loose electrical connector pins at the sensor or the transmission control module; Low or contaminated transmission fluid, which can affect hydraulic pressure readings and sensor performance; Sticking or faulty pressure regulator valve in the valve body, causing actual hydraulic pressure to exceed commanded values; A failing transmission control module (TCM) that misinterprets sensor signals or has internal faults; Restricted hydraulic passage or a blocked filter, leading to abnormal pressure buildup that the sensor correctly reports

DTC codes / Volkswagen codes / P1773

P1773 · VolkswagenHydraulic Pressure Sensor 1 Too High

Q: What does code P1773 mean?

Hydraulic Pressure Sensor 1 Too High. P1773 on Volkswagen vehicles means the transmission control module has detected that the hydraulic pressure sensor 1 signal is higher than the expected range for the current operating conditions. The sensor monitors pressure inside the direct shift gearbox (DSG) hydraulic circuit, and the module sets this code when the voltage or calculated pressure exceeds a calibrated threshold.

P1773 on Volkswagen vehicles means the transmission control module has detected that the hydraulic pressure sensor 1 signal is higher than the expected range for the current operating conditions. The sensor monitors pressure inside the direct shift gearbox (DSG) hydraulic circuit, and the module sets this code when the voltage or calculated pressure exceeds a calibrated threshold.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

Symptoms you may notice

Illumination of the transmission warning light or check engine light, often with no other symptoms
Harsh or delayed gear engagements, especially when selecting drive or reverse from a stop
Transmission entering limp mode with reduced gear availability or stuck in a single gear
Jerky or inconsistent shifting quality during acceleration or deceleration
A stored code accompanied by a message such as 'Transmission: Workshop!' in the instrument cluster
In some cases, the vehicle may refuse to engage a gear or may disengage drive unexpectedly

Common causes, most likely first

Faulty hydraulic pressure sensor 1, which may read high due to internal sensor degradation or contamination
Damaged or chafed wiring harness between the pressure sensor and the transmission control module, causing a short to voltage or signal interference
Corroded or loose electrical connector pins at the sensor or the transmission control module
Low or contaminated transmission fluid, which can affect hydraulic pressure readings and sensor performance
Sticking or faulty pressure regulator valve in the valve body, causing actual hydraulic pressure to exceed commanded values
A failing transmission control module (TCM) that misinterprets sensor signals or has internal faults
Restricted hydraulic passage or a blocked filter, leading to abnormal pressure buildup that the sensor correctly reports

How to diagnose and fix it

Verify the code with a Volkswagen-specific scan tool and check for any related transmission codes or freeze-frame data
Inspect the transmission fluid level and condition, looking for contamination, metal particles, or a burnt smell
Visually inspect the wiring harness and connector at the hydraulic pressure sensor 1 for damage, corrosion, or loose pins
Perform a resistance and voltage check on the sensor circuit according to the factory wiring diagram to rule out wiring faults
Compare live pressure sensor readings with commanded pressure values using the scan tool to determine if the sensor is reporting falsely high
If the sensor signal is confirmed faulty, replace hydraulic pressure sensor 1 and clear the codes
If the sensor and wiring test good, inspect the valve body for sticking valves or debris, and consider professional diagnosis of the TCM or internal hydraulic faults

What the pressure sensor reading really means

A high pressure sensor reading does not automatically mean the sensor is bad; actual hydraulic pressure can be genuinely high due to a sticking valve or restricted passage, so always compare commanded versus actual pressure before replacing parts.
Volkswagen DSG transmissions are sensitive to fluid condition, and degraded fluid can cause pressure anomalies that trigger P1773 without any hard part failure.
The wiring harness for the pressure sensor often routes near hot or moving components, and chafing can create intermittent shorts that only appear under certain driving conditions.
A weak battery or charging system fault can cause voltage spikes that affect sensor signals and set false pressure codes on Volkswagen transmissions.
After replacing the sensor or repairing wiring, a basic setting or adaptation reset with a factory scan tool is often required to relearn pressure characteristics and prevent the code from returning.

Can I keep driving with P1773?

You can drive cautiously to a workshop if the transmission is not in limp mode and shifts normally, but avoid aggressive acceleration or heavy loads. If the transmission enters limp mode, refuses to engage gears, or slips, stop driving and arrange a tow to prevent further damage.

Tools that help

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Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.