Faulty governor pressure sensor (internal transmission sensor) sending a low voltage signal; Damaged or corroded wiring harness or connector at the transmission pass-through; Poor electrical ground or reference voltage circuit issue to the sensor; Low transmission fluid level or degraded fluid causing low actual pressure; Sticking governor pressure solenoid or valve body issue affecting pressure regulation; Internal transmission mechanical wear causing low governor pressure; TCM software calibration or internal fault (less common)

DTC codes / GM codes / P1764

P1764 · GMGovernor Pressure Sensor Voltage Too Low

Q: What does code P1764 mean?

Governor Pressure Sensor Voltage Too Low. P1764 on GM vehicles means the transmission control module (TCM) has detected that the governor pressure sensor signal voltage is lower than the expected range for the current operating conditions. The governor pressure sensor reports actual hydraulic pressure inside the transmission, so a low voltage indicates either a faulty sensor, a wiring problem, or an internal pressure issue that the TCM cannot trust.

P1764 on GM vehicles means the transmission control module (TCM) has detected that the governor pressure sensor signal voltage is lower than the expected range for the current operating conditions. The governor pressure sensor reports actual hydraulic pressure inside the transmission, so a low voltage indicates either a faulty sensor, a wiring problem, or an internal pressure issue that the TCM cannot trust.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

Symptoms you may notice

Illuminated check engine light or transmission warning light, often with no other noticeable symptoms
Harsh or delayed shifts, especially when the transmission is cold
Transmission stuck in limp mode or a single gear due to default pressure strategy
Slipping or flaring during gear changes under acceleration
Erratic shift points or torque converter clutch engagement
Reduced fuel economy from improper shift scheduling

Common causes, most likely first

Faulty governor pressure sensor (internal transmission sensor) sending a low voltage signal
Damaged or corroded wiring harness or connector at the transmission pass-through
Poor electrical ground or reference voltage circuit issue to the sensor
Low transmission fluid level or degraded fluid causing low actual pressure
Sticking governor pressure solenoid or valve body issue affecting pressure regulation
Internal transmission mechanical wear causing low governor pressure
TCM software calibration or internal fault (less common)

How to diagnose and fix it

Check transmission fluid level and condition; top off or service if low or burnt
Inspect the governor pressure sensor connector and wiring for corrosion, chafing, or loose pins
Measure reference voltage and ground at the sensor connector with a multimeter; compare to GM specifications
Backprobe the sensor signal wire and compare voltage to a known-good sensor or scan tool pressure reading
Replace the governor pressure sensor if voltage remains low with good wiring and fluid level
Test governor pressure solenoid and valve body operation if the new sensor does not resolve the code
Clear codes and perform a relearn or adaptation drive cycle, then verify the code does not return

Governor pressure sensor voltage traps on GM

A low voltage code often sets from a simple loose or corroded connector at the transmission, not a failed sensor, so always inspect the harness before condemning the sensor.
Low transmission fluid level or a clogged filter can cause actual low governor pressure that mimics a sensor voltage fault, so fluid condition is a critical first check.
The governor pressure sensor is inside the transmission pan on many GM units, making replacement a messy job that requires dropping the pan and replacing fluid and filter.
A sticking governor pressure solenoid can hold pressure low and set P1764 even when the sensor itself is good, so solenoid testing is essential before parts replacement.
This code can appear intermittently with no drivability symptoms, leading some technicians to clear it without diagnosing an underlying wiring issue that will return.

Can I keep driving with P1764?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration, towing, or long highway trips because the transmission may be in a default pressure strategy that can cause harsh shifts or slipping. If the transmission is stuck in limp mode or slipping severely, stop driving and arrange a tow to prevent internal damage.

Tools that help

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