Question about 2000 Jeep Grand Cherokee

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Electronic control unit internal malfunction

Transmission will not shift to higher gear till engine warms up.had codes checked at parts store,( front right and left and right rear wheel speed signal malfunction , electronic control unit internal malfunction ,under voltage ,and multiple misfire cylinder 5 and 6

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Transmission won't shift out of 1st gear

the output spped sensor is on the drivers side rear of the transmission case..its a 2 wire connector..the wires are dark bluewith a black tracer and light green with a white tracer

Posted on Oct 01, 2008

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  • 55 Answers

SOURCE: fault code P0720

code po720 is the output speed sensor malfunction

Posted on Jan 29, 2009

  • 53 Answers

SOURCE: 1999 grand cherokee laredo 4.0 and auto trans wont downshift

The Transmission Control Module also turns on the check engine light. However the parts store won't be able to read these codes since all they read are the Engine DTC's. More then likely your codes will come back to a Governor Pressure Sensor and/or Switch. If they do then remove the pan and replace both of those. Simple fix, should be able to be done in about an hour or so. Might as well go ahead and slap a speed sensor in while you're under there. Should be able to do it yourself for less then $200.

Posted on Dec 20, 2009

ronaldo_ross
  • 1056 Answers

SOURCE: Jeep Grand Cherokee 2.7CRD (2004) auto won't change gear

check all the fuses before you do anything else. After all a fuse provides power to the electronic box that controls the transmission. Other than that I would not advice on a more complicated troubleshooting since there is no way for you to test a bad transmission computer, even mechanic shops don't know how to test them. The only thing they would do is slap a known good one and see what happens.

Posted on Dec 27, 2009

wracefans24
  • 1985 Answers

SOURCE: proper way to check transmission fluid

You always check transmission fluid with it running and in park,If your dip stick has a place on it for cold use it cold,Other wise it should be on the full mark,you might want to look under your jeep for any new leaks!

Posted on Dec 29, 2009

Testimonial: "thanks alot, thats what I thought, no leaks that I can see, I guess they didn't fill it all the way back up"

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2 Answers

Code p2712 after prier owner added brake fluid to transmission


The transmission fluid must be the specified type and make otherwise your gear box may fail.
Brake fluid is for brakes, transmission fluid is for gearboxes!

Definition of check engine code P2712:
Generic (Common for all car manufacturers):
Hydraulic Power Unit Leakage

Feb 27, 2018 | Cars & Trucks

1 Answer

My BMW 2002 starts out good in morning but when it gets warm or hot my transmission failsafe light comes on what can I do


BMW has been using electronically controlled automatic transmissions in most models since the late '80s. These transmission systems employ a transmission control unit which controls electrical solenoids to manipulate the various control and shift valves and functions in the transmission valve-body. When the transmission control unit detects a problem that it "thinks" could be damaging to the transmission or engine, it goes into a fail-safe or "limp" mode. In this mode, the transmission will function in reverse normally, but in forward it will operate in only one gear (whether you have the shifter in D, or any of the lower gears). This will typically be 3rd or 4th gear, depending on the model. It will start in this gear and stay in this gear with no shifting. You would experience this as sluggish acceleration and higher than normal engine speed at about 40-mph and above.
If you must drive the vehicle when the transmission is in the fail-safe mode, accelerate gently and keep the road speed lower than full highway speed.
Earlier models do not employ fault codes and must be diagnosed manually. Late models do employ fault codes and a diagnostic/scan machine can be used to check and read the faults to assist in diagnostics. Note that this is not your common OBD-II engine management fault code tool. This is what A BMW dealer or a properly equipped independent shop would have for full vehicle system diagnostics and coding operations.

Jun 15, 2017 | BMW Cars & Trucks

3 Answers

Dodge caravan


Both error codes you have are transmission related. P0736 is an error for reverse has wrong gear ratio. P0700 is a general transmission problem code
http://www.obd-codes.com/p0700
http://www.obd-codes.com/p0736
for more information.

Mar 22, 2015 | Dodge Caravan Cars & Trucks

3 Answers

How can I fix my 2004 Dodge Stratus w ith Fault code P0700


Dodge is quirky about voltage, and transmission(DC-PO700) shift selonoids are electronically controlled actuators and your PO622 Diagnostic Code is usually found with voltage irregularity such Wave,Ripple,or square voltage issues(indications that your about to have alternator or battery failure..I would try a new battery and have my alternator checked if codes persist. Best Wishes & Happy Motoring!

Jan 21, 2015 | 2004 Dodge Stratus

1 Answer

My 2002 dodge intrepid transmission shifts fine till it gets warm then it down shifts when coming to a stop and wont upshift till i turn the ignition off and restart what is the problem


Hello
The engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM

Aug 28, 2012 | 2002 Dodge Intrepid

2 Answers

Code p0734 I just replaced eng. and trans. now have this code.


Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting Possible causes - Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit Tech notes Start by inspecting the transmission fluid level and condition, and change fluid if necessary. When is the code detected? P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good. P0734 NISSAN Description This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (4th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

Aug 09, 2011 | 1995 Nissan Altima

1 Answer

My came with a code po734 is that a big problem?


DTC P0734 - Improper Ratio for Fourth Gear.
P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good.

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (4th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

Tech notes: Start by inspecting the transmission fluid level and condition, and change fluid if necessary.


Test and check it and send us ypur comments.

May 14, 2011 | 2000 Land Rover Discovery

2 Answers

Ford trauras trouble code 732 - was told transmission code 732 was being produced, what does a code 732 say?


P0732 FORD - Incorrect Second Gear Ratio
Transmission in second gear and the ECM detected an incorrect gear ration. This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (2nd) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect transmission shifting

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

Tech notes
Start by inspecting the transmission fluid level and condition, and change fluid if necessary.


Hope helps.

Apr 26, 2011 | Ford Taurus X Cars & Trucks

1 Answer

1997 jeep cherokee gears stick between 2nd and 3rd gear


If shift is delayed, it may be due to either temperature or varnish in unit. Has the oil been changed in unit at regular intervals? Low temps with even slight varnish buildup can give poor shifts, but it usually clears up as it warms up. If unit is "flairing" (engine speed increases with no shift & slight sensation of power loss ) then shifts, this can be the result of internal wear. If trans oil is very old and dirty, change oil & filter.(if there is an excessive amount of fine metal or non magnetic debris in unit, likely there is internal damage) If fluid is clean and unburned, check to see if your vehicle is equipped with an electronic shift module (have someone check codes to test). Otherwise, unless you are a technician, bring it to a reliable transmission shop.

Jan 15, 2009 | 1997 Jeep Grand Cherokee

1 Answer

At higher speed the car refuses to shift to the next gear. Cannot move faster. DTC code indicates "Transmission Ration Control Motor" What do I do?


Murano doesn't shift. It has a CVT trans. (continuesly variable transmission). no shifting involved. I think that you have an internal failure, which would mean replacement of the unit. No rebuild parts available from Nissan. Whole unit only.

Jul 15, 2008 | 2003 Nissan Murano

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