Question about 1997 Chevrolet Lumina

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How can I tell if my automatic transmission modulator valve is going out?

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Connect a hand-held vacuum pump to the vacuum connection on the modulator( remove from vehicle) and apply 15 to 20 inches of vacuum while watching the plunger.if the plunger isn't drawn in as vacuum is applied, the modulator needs to be replaced

Posted on Jul 20, 2010

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2005 chevy malibu damage Light front end damcodend error codes P0401 P0605 P0842 P0642 The 0401 code is being thrown twice and I belive it is the egr wich is common on these cars from what my buddy tells...


DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient
Probably plugged passage's , not the EGR valve .
What type code reader are you using to read these codes ? I have factory service info. Doesn't show P0842 or P0642 , no such codes . You don't show what engine yours has , I'am assuming you have 3.5 L !
P0604
Control Module Random Access Memory (RAM)
PCM
DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 in Engine Controls - 2.2L (L61)
or
DTC P0601, P0602, P0603, P0604, P0605, P0606, P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610 in Engine Controls - 3.5L (LX9)

P0717
Input Speed Sensor Circuit Low Voltage
PCM
DTC P0717 in Automatic Transaxle - 4T40-E/4T45-E
P0741
Torque Converter Clutch (TCC) System - Stuck Off
PCM
DTC P0741 in Automatic Transaxle - 4T40-E/4T45-E
P0742
Torque Converter Clutch (TCC) System - Stuck On
PCM
DTC P0742 in Automatic Transmission - 4T40-E/4T45-E
P0748
Pressure Control (PC) Solenoid Control Circuit
PCM
DTC P0748 in Automatic Transmission - 4T40-E/4T45-E
P0751
1-2 Shift Solenoid (SS) Valve Performance - No First or Fourth Gear
PCM
DTC P0751 in Automatic Transmission - 4T40-E/4T45-E
P0752
1-2 Shift Solenoid (SS) Valve Performance - No Second or Third Gear
PCM
DTC P0752 in Automatic Transmission - 4T40-E/4T45-E
P0753
1-2 Shift Solenoid (SS) Control Circuit
PCM
DTC P0753 in Automatic Transmission - 4T40-E/4T45-E
P0756
2-3 Shift Solenoid (SS) Valve Performance - No First or Second Gear
PCM
DTC P0756 in Automatic Transmission - 4T40-E/4T45-E
P0757
2-3 Shift Solenoid (SS) Valve Performance - No Third or Fourth Gear
PCM
DTC P0757 in Automatic Transmission - 4T40-E/4T45-E
P0758
2-3 Shift Solenoid (SS) Control Circuit
PCM
DTC P0758 in Automatic Transmission - 4T40-E/4T45-E
P0815
Upshift Switch Circuit
PCM
DTC P0815 in Automatic Transmission - 4T40-E/4T45-E
P0816
Downshift Switch Circuit
PCM
DTC P0816 in Automatic Transmission - 4T40-E/4T45-E
P0826
Up and Down Shift Switch Circuit
PCM
DTC P0826 in Automatic Transmission - 4T40-E/4T45-E
P0973
1-2 Shift Solenoid (SS) Control Circuit Low Voltage
PCM
DTC P0973 in Automatic Transmission - 4T40-E/4T45-E
P0974
1-2 Shift Solenoid (SS) Control Circuit High Voltage
PCM
DTC P0974 in Automatic Transmission - 4T40-E/4T45-E
P0976
2-3 Shift Solenoid (SS) Control Circuit Low Voltage
PCM
DTC P0976 in Automatic Transmission - 4T40-E/4T45-E
P0977
2-3 Shift Solenoid (SS) Control Circuit High Voltage
PCM
DTC P0977 in Automatic Transmission - 4T40-E/4T45-E

Sometimes with code readers they get confused an just throw any old codes . Have it checked by someone with GM Tech 2 scan tool .

Aug 03, 2017 | Chevrolet Malibu Cars & Trucks

1 Answer

2004 chevy trailblazer were do the vacuum lines go to from the transmission


What transmission does your trailblazer have ? automatic or manual ? If automatic 4L60E , it has no vacuum hose's ,unless you or someone else modified it . E in 4L60E stands for electronic . Back in the day there were vacuum hose's going to the automatic trans 1 to the vacuum modulator valve .

Apr 28, 2016 | Cars & Trucks

1 Answer

How do i replace transmission modulator valve on a 1991 gmc sierra 1500 4.3


UNLESS you have a TH400 3 speed HD automatic transmission, which I HIGHLY doubt being it's a 1500 with a 4.3, you won't have a vacuum modulator. UNLESS someone swapped an older TH350 or TH400 transmission into the truck.

Instead you'll have what called a TV cable, or throttled valve cable.

This cable should be located on the passenger side of the transmission and is routed up to the side of the throttle body and hooked up like the old "kick down" cables.

The TV cable isn't simply a "kick down" cable, even though it does act like one, it also adjusts the pressure for the transmission to shift at different throttle positions. Much like the old vacuum modulators did.

Hope this helps.

Feb 10, 2015 | GMC Cars & Trucks

1 Answer

What does diagnostic code PO0706 and PO700 mean?


OBD II Fault Code
  • OBD II P0706
Fault Code Definition
  • Transmission Range Sensor Circuit Range/Performance
The purpose of the automatic transmission is to match the engine's optimum power and torque characteristics to the driver's desired rate of acceleration and speed by auto-selecting different gear ratios or 'speeds' to power the wheels. The Transmission Range Sensor (also referred to as the PRNDL input and/or neutral safety switch) tells the transmission control module (TCM) and the powertrain control module (PCM) that the transmission is in park, reverse, neutral, drive, low, 2nd, 3rd etc. It is attached directly to the manual valve of transmission, so when the shift lever is moved say from park to drive, the Transmission Range Sensor communicates this critical information to the above mentioned vehicle computer systems.

P0700
Many vehicles have a control module for the automatic transmission called a transmission control module (TCM). The engine control module (ECM) communicates with the TCM to monitor the automatic transmission for faults. If the TCM detects a fault in the automatic transmission and sets a transmission related fault code, the ECM is informed of this also and sets a P0700 in the ECM memory.

May 18, 2013 | 2000 Honda Civic

1 Answer

Install modulator valve 1991 ford explorer automatic transmission


they all pretty much look like this, and just one screw holds them down3_15_2013_8_56_53_am.png

Mar 15, 2013 | 1991 Ford Explorer

1 Answer

Where is the modulator valve for a 93 gmc 1500 5.7


Im assuming that you are talking about Automatic Transmission Modulator Valve, will be to the back of your transmission, on the side, will have a vacuum hose going to it.


Parts replacement could be ordered HERE.



Hope this helps.

Nov 14, 2012 | Cars & Trucks

1 Answer

My sister has a 1998 Audi A4 (automatic transmission). She tells me that there is a acceleration problem. The engine will rev to the moon then all of a sudden the gear will catch and away she goes. I...


SOUND LIKE TRANSMISSION SLIPPING. CHECK TRANSMISSION FLUID LEVEL.IF FLUID LEVEL OKAY BUT FLUID LOOKS DARK SMELL BURNT.CHANGE TRANSMISSION FLUID AND FILTER ADD SOME VALVE BODY TREATMENT TO LOOSEN STICKEN SHIFT VALVES.ADD TO TRANSMISSION FLUID DONT OVER FILL TRANSMISSION WILL CAUSE OVERHEAT. IF TRANSMISSION FLUID GOOD FILTER ALREADY BEEN CHANGED.IF ALL GOOD ENGINE BEEN TUNED UP OTHER POSSIBLE CAUSES FOR TRANSMISSION SLIPPING NOT GOING TO OVER DRIVE COULD BE THROTTLE SHIFT CABLE OUT ADJUSTMENT OR STRETCHED. TORQUE CONVERTER FAULTY OR SHIFT VALVES TO TORQUE CONVERTER OR OVER DRIVE STUCK IN VALVE BODY. VALVE BODY FAULTY. AND HAVE VECHICLE SCANNED FOR FAULTY VECHICLE SPEED SENSOR OR FAULTY THROTTLE CONTROL MODULE OR FAULTY THROTTLE POSITION SENSOR. THEY WILL EFFECT TRANSMISSION SHIFT TO OVER DRIVE IF FAULTY.

Dec 22, 2010 | Audi A4 Cars & Trucks

1 Answer

1995 Saturn automatic trans. shifting hard enough to brake motor mounts. Any suggestions for fixing


you may need to change the modulator valve on transmission and also check the modulator valve to be sure it's getting the proper vacum to it. the modulator valve controls shifting in the transmission. also suggest lucas transmission treatment be added to transmission fluid, it frees up stuck valves in transmission. hope this helps!!!

Sep 11, 2010 | 1995 Saturn Sl

1 Answer

My nissan sunny GA15DE was overhauled but started having rough idle immediately threafter. what could have caused this? Gerald


Gerald:Was the engine overhauled because of the smoking problem? If so, the auto trans solution is more likely your problem. Good Luck
  • Automatic transmission? - Check vacuum line to transmission . The only line of rubber going to trans. Located where it attaches ro trans and rwmove it watching to see if it contains any trans fluid. If hose has oil in itm Then replace the valve it was attached to. The valve is called a transmission modulator. The diaphragm is rupture and aloowing engine vacuum to **** and burn the fluid. your trans should be needing fluid too often. Modulator around 12.00 last known.
  • Manual transmission ? - PCVvalve not bafflrd against drawing oil from its location in valve cover.and or Pcv valve is defective. Cheap fix-replace

Apr 13, 2009 | 1994 Nissan Sentra 4-Door

2 Answers

Automatic Transmission


should be on the side of the transmission with a vacuum hose connected to it

Aug 10, 2008 | 1995 Buick Century

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