Question about 1999 Jeep Grand Cherokee
P1762 - Governor Pressure Sensor Offset Improper Voltage
P1763 - Governor Pressure Sensor Voltage Too High
P1756 - Governor Pressure Not Equal To Target At 15-20 PSI
Your automatic transmission pressure governor has higher pressure than it should. This could be caused by a sticking selenoid, or a dirty filter. When is the last time you changed the ATF and filter? If it's been a while, I'd go that route first. Otherwise, a transmission shop may have to perform a series of air pressure tests on the transmission.
Chrysler manual says:
GOVERNOR PRESSURE SENSOR
The governor pressure sensor supplies the transmission pressure input to the Powertrain Control Module on circuit T25. Circuit T25 connects to cavity B29 of the PCM. Circuit K6 from cavity B31 of the PCM supplies 5 volts to the sensor. The PCM provides ground for the govenor pressure sensor on circuit K4. Circuit K4 connects to cavity A4 of the PCM.
The governor pressure sensor is part of the transmission solenoid assembly.
GOVERNOR SOLENOID AND PRESSURE SENSOR
Hoist and support vehicle on safety stands.
Remove transmission fluid pan and filter.
Disengage wire connectors from pressure sensor and solenoid
Remove screws holding pressure solenoid retainer to governor body.
Separate solenoid retainer from governor
Pull solenoid from governor body
Remove bolts holding governor body to valve body.
Separate governor body from valve body
Remove governor body gasket.
Remove retainer holding pressure sensor to governor body.
Pull pressure sensor from governor body
Before installing the pressure sensor and solenoid in the governor body, replace O-ring seals, clean the gasket surfaces and replace gasket.
Lubricate O-ring on pressure sensor with transmission fluid.
Align pressure sensor to bore in governor body
Push pressure sensor into governor body.
Install retainer to hold pressure sensor to governor body.
Place gasket in position on back of governor body
Place governor body in position on valve body.
Install bolts to hold governor body to valve body.
Lubricate O-ring, on pressure solenoid, with transmission fluid.
Align pressure solenoid to bore in governor body
Push solenoid into governor body.
Place solenoid retainer in position on governor
Install screws to hold pressure solenoid retainer to governor body.
Engage wire connectors into pressure sensor and solenoid
Install transmission fluid pan and (new) filter.
Lower vehicle and road test to verify repair.
Keep us updated.
Posted on Dec 31, 2010
Sounds like the shift solenoid for 1st gear is bad.. Just my educated guess. I hope someone helps you better than I
Posted on Dec 31, 2010
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Posted on Jan 02, 2017
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