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Greg
Greg, Technician
Category: Transmissions
Satisfied Customers: 6806
Experience:  17 years Shop Owner /Technician. 27 years experience
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I have a 2001 jeep grand cherokee laredo 4wd 6 cyl The o/d

Customer Question

I have a 2001 jeep grand cherokee laredo 4wd 6 cyl
The o/d off light came on and then transmission overheating dash light came on. Let it cool down and got it home the in the morning no reverse
Im finding information on line about this same problem with several possible solutions. 42RE transmission
change our governor pressure solenoid, all filters and check wiring
replace transmission control solenoid
check ball valve in cooling line to radiator
Submitted: 1 year ago.
Category: Transmissions
Expert:  Greg replied 1 year ago.

One question .

Before you did all this work did you check for malfunction codes .

When you drained off the fluid, what colour was it ..

Customer: replied 1 year ago.
I said I am researching this problem
Which others have had
Have not done anything yet
The tranny fluid is red and not burnt
And levels are where they should be
Customer: replied 1 year ago.
Not getting any codes off clicking start three times
Expert:  Greg replied 1 year ago.

Okay first if the O/D light is flashing then you have a transmission malfunction code or codes

stored in the PCM.

Now you need a diagnostic scan tool to check for malfunction codes ,from the codes this will put you on the right direction to where the problem is .

Now if you have a malfunction code P0720 which is a typical code on this vehicle .

So for your research here is an example .

P0720 is a OUTPUT SPEED SENSOR ERROR. this does not mean that you have to replace this part but to test it first as

you may have a wiring / connection problem or even a bad PCM .

POSSIBLE CAUSES :
INTERMITTENT WIRING & CONNECTORS CONDITIONS
REPLACE OUTPUT SPEED SENSOR
OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
SPEED SENSOR GROUND CIRCUIT OPEN
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
SPEED SENSOR GROUND CIRCUIT SHORT TO VOLTAGE
PCM DEFECTIVE

So as you can see checking for codes is very important ,

Not a good idea to start replacing parts on assumption, or from some forum that said he had the same problem replace all the solenoids ?? when the problem could be justy a cheap speed sensor or a bad wiring connection or plug..

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I will be happy to continue further and do everything I can to provide you with the service you seek.

Kind regards Greg

Expert:  Greg replied 1 year ago.

You need a dealer level scan tool to get transmission codes .

Greg

Expert:  Greg replied 1 year ago.

The on off of the ignition is just for OBD II codes

Customer: replied 1 year ago.
Had the computer checked and only one code came up P0740
Expert:  Greg replied 1 year ago.

Possible causes

Low transmission fluid level
Dirty transmission fluid
Faulty torque converter clutch solenoid valve
Torque converter clutch solenoid valve harness is open or shorted
Torque converter clutch solenoid valve circuit poor electrical connection.

Rgds Greg