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I got a p1781 code on my 99 jeep - Cars & Trucks

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TYPE: 1999 Jeep OBD P1781

Posted on Nov 18, 2014

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6ya6ya
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Posted on Jan 02, 2017

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2000 intrepid, 42LE electronic 4-speed autotransaxle. O/D preasure switch circuit malfunction, Code: p1781; p0760; p0755


did you also find out that P0755 & 760 were shift solenoids B & C respectively? probably looking at replacing those. Chiltons are no help when it comes to trans work. Had a '99 LH car with a 3.2L also. Maybe look for a Service manual online, you know the ones for dealers.

Oct 28, 2012 | 2000 Dodge Intrepid

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What does these codes mean P1781, P0731, P1784 AND P0700 AND HOW DO I FIX THEM.


p1781 is manufacturer control transmission, p0731 is gear 1 ratio incorrect, p1784 is manufacturer control transmission, p0700 is trans, control system malfunction. all of these codes refer to tranny.This code normally points to a faulty transmission control module, but this is an expensive part and you should have an experienced Dodge technician diagnose the problem first. or a transmission specialist. the other codes are probably associated with the p0700 code. have a good day !

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Codes p1781, p1784, trans locks up like in for. & rev


iff u call chrysler they will tell u wat codes r for checked my computer codes r main dealer only

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P1781 DTC


DTC P1781 - Engine Torque Signal Circuit

This code is set during engine start up when the ECM & TCM do not communicate properly during initial power up. It will only illuminate the service light if the condition occurs in 2 consecutive start cycles, but the DTC will be stored in the failure records after the first cycle.

Hope helps.

Jun 24, 2010 | 2004 Chevrolet Aveo

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Diagnostics Reading: P1781


P1781 4x4 Switch Out Of Range

Couple things to check, transfer case and front diff fluids, make sure no wires are bare or shorting together on either transfer case or front diff, just to eliminate the easy stuff first. I would also check the connectors at the ECM and TCM just to make sure they are secure and tight.

Hope helps.

Jun 05, 2010 | 2001 Daewoo Leganza

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I have a 1999 Jeep Grand Cherokee Laredo and the transmission doesn't work first thing in the morning. Once you have driven approximately 1 block, stop put it in park, turn the engine off and then...


If it were me, I would try replacing the pressure switch and see if that fixed it.
I looked it up and it appears that switch may be deep inside the transmission, which might mean it costs big bucks to replace it.
God bless your efforts.

May 26, 2017 | 1999 Jeep Grand Cherokee

1 Answer

Transmission will not shift out of low on my chevy 2001 3500 , the code is p0700 and p1781, p1721


P0700 will come up with most all codes or faults to do with a transmission,P1781 is 4X4 switch out of range,I have never heard of a P1721 but a P0721 is trans output sensor range or performance.If the computer isn't getting a output speed it doesn't know that it should shift.I would check all your wiring down around the trans area looking for broken or grounded wires if ok have the speed sensor checked for being opened.

Feb 10, 2010 | 2001 Chevrolet Silverado

1 Answer

Codes given are p0700 and p1781. Anyone know what these codes stand for? Thanks


The Transmission shop lacks the skills and tools need to do the job. It's best to call around for a shop that has a proper scanner to talk to the TCM computer. The real trouble codes are in there. The best place would be a shop that has a ASE mechanic on duty or the Dealership.

Here what the two codes means:

P0700 Transmission Control System Malfunction
It means you have a trans control problem in the trans computer.
You will need to get it on a trans capable scanner to see what the trans code or problem is.

the P1781 is set during engine start up when the ECM & TCM do not communicate properly during initial power up. It will only illuminate the service light if the condition occurs in 2 consecutive start cycles, but the DTC will be stored in the failure records after the first cycle.

Apr 15, 2009 | 2004 Chevrolet Aveo

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