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No reverse and P0720 code is on

Truck was fine all of a sudden no reverse gear

Posted by Anonymous on

4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

Molson02536
  • 3854 Answers

SOURCE: My '99 Silverado 1500 Z71 has been an awesome

No reverse, here are few things you can try before needing to take it to a tranny shop. The 4l60e trans is a fully electronic trans. And being so the problem could be as simle as the reverse shift solenoid has shortted out. Along that same line the reverse valve could be stuck and or the little screen that is attatched to the mid plat could be clogged and in order fix this problemyou need to drop out the valve boby and for the most part rebuild the reverse circute.

Now for the hard stuff. Other problems you could look at.
imput housing assembly - 3-4 apply ring stuck in applied position.
- forward clutch not releasing
- turbine shaft seals missing,cut or damaged.

manual linkage - not adjusted

oil pump assembly - retainer and ball assembly missing or damaged.
- stator shaft seal rings or ring grooves damaged.
- stator shaft sleeve scored or damaged.
- revers boost valve stuck, damaged or misassembled.
- cup plug missing.
- restricted oil passage.
- faces not flat.
- converter clutch apply valve stuck.

valve body assembly - 2-3 shift valve stuck.
- manual linkage not adjusted.
- spacer plate and gaskets incorrect, misposition or damaged.

reverse input clutch - clutch plate worn.
- reverse input houeing and drum assembly cracked at weld.
- clutch plate retaining ring out of groove.
- return spring asembly retaining ring out of groove.
- piston deformed or dished.
- seals cut or damaged.
- retainer and ball assembly not sealing.
- restricted apply passage.

lo and reverse clutch - clutch plates worn.
- clutch plate retaining ring mispositioned.
- porosity in piston.
- seals damaged.
- return spring assembly retaining ring mispositioned.
- restricted apply passage.

case - cover plate gasket missing or damaged.
- cover plate not torgued correctly.
- porosity.

now thhis came from my 4l60 service book.
hope this helps

Thank you for using fixya and be safe


Posted on Jul 07, 2010

  • 29 Answers

SOURCE: 2001 Dodge Grand Caravan 3.3 Motor 4 Speed

Replace the transaxle or see if it can be rebuilt. Those transaxles have incorporated electronic solenoids that can fail causing the codes to appear as you described. One thing you might check prior to getting it rebuilt or replaced is have the computer checked and check all of your wiring connections. Anytime you have a wiring connector on the exterior of the vehicle you can get corrosion issues it may be simply cleaning the connectors, placing dielectric grease on them and reattaching. Before cleaning any connectors always disconnect the negative battery terminal.

Posted on Jan 14, 2011

SOURCE: my 2007 ford f150 will not go into reverse what could this be?

Most likely internal trans damage

Why !! Won't know until you take it apart
& then you may see the issues but never
know the cause

Hope you only have one trans problem in a lifetime

I have had a couple,one I rebuilt & one I payed
a fair amount for

Then I went into the trans repair shop as an owner
& it isn't pretty what happens there with all the transaxles
especially

You could hold out a small amount of hope that it can
be diagnosed & only a solenoid is blocked

Posted on Oct 02, 2012

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1 Answer

OBD 2 ERROR CODE P0720


Here's a link to your code P0720. P0720 OBD II Trouble Code

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I have a 2004 dakota codes p0052 p0732 p0720 p0731 p0700. Bought non running and had a 3.7 installed got back and it jerks when taking off and won't shift out of 1st gear. Limp mode? Any ideas?


P0700 Transmission control system malfunction
P0720 output speed sensor circuit malfunction
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Code P0736, P0731, P0720, P0700


Well code 700 is a generic code that means there is a problem with the transmission or the control module.
Code 736 is an incorrect gear ratio for reverse, code 731 is incorrect ratio in first gear, and 720 is the code for the speed sensor which involves the engine computer as well as the speedo.
Its possible the speed sensor is causing the other codes.
I would have a shop check the speed sensor circuit, clear the codes, and see how many come back then proceed with more testing as needed.

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Code p0720


I looked up the code in the Haynes Repair Manual due to having the same car this is what it says for your code-P0720 Low Output SPD sensor RPM, Above 15 MPH. The relationship between the Output Shaft Speed Sensor and vehicle speed is not within acceptable limits.

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Car drives in reverse but no other gear selector


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How many sensors o2 dodge neon have


P0732 Gear 2 Incorrect Ratio
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P0736 Reverse Incorrect Ratio
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1 Answer

Check engine light with following codes p 1529 p0720 p0715


P1529 indicates that your TCM asked the ECM to turn on the check engine lamp.

The range switch and the output speed sensors are the items that are abnormally affecting the operation of the transmission. The diagnostic logic in your computer can distinguish these issues from one another, so you'll definitely want to do both. You have no diagnostic code for the input speed sensor (P0715) listed, so I have made no recommendation to replace it. In my opinion, it's not a labor-intensive repair, so I wouldn't recommend replacing it unless you have reason to believe it's bad.

DTC - P0720 (OUTPUT SHAFT SPEED SENSOR SYSTEM)
Code No. P0720 Output shaft speed sensor system
If the output from the output shaft speed sensor is continuously 50% lower than the vehicle speed for 1 second or more while driving in 3rd or 4th gear at a speed of 30 km/h or more, it is judged to be an open circuit or short-circuit in the output shaft speed sensor and diagnostic trouble code No. P0720 is output. If diagnostic trouble code No. P0720 is output four times, the transmission is locked into 3rd gear or 2rid gear as a fail-safe measure.
Probable cause
Malfunction of the output shaft speed sensor
Malfunction of the transfer drive gear or driven gear
Malfunction of connector
Malfunction of the TCM

DTC - P0715 (INPUT SHAFT SPEED SENSOR SYSTEM)
Code No. P0715 input shaft speed sensor system
If no output pulse is detected from the input shaft speed sensor for 1 second or more while driving in 3rd or 4th gear at a speed of 30 km/h (19 mph) or more, it is judged to be an open circuit or short-circuit in the input shaft speed sensor and diagnostic trouble code No. P0715 is output. If diagnostic trouble code P0715 is output four times, the transaxle is locked into 3rd gear or 2nd gear as a fail-safe measure.
Probable cause
Malfunction of the input shaft speed sensor
Malfunction of the underdrive clutch retainer
Malfunction of connector
Malfunction of the TCM

Is needed replace.

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2 Answers

Codes p0300 and p0720


The P0300 is down to a cylinder misfire, usually it will have a number like 0302 where the 2 would mean the misfire is in number 2 cylinder. When were the plugs and wires last changed? what milage is on the vehicle?
P0720 is the output shaft speed sensor seems to be more of a common problem on the older hyundai's, is the gear change smooth or erratic? has it ever locked itself into gear? if you clear these codes how quickly do they come back?

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