Question about 2001 Hyundai Sonata

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U3600 output speed sensor

Car shifted very hard then check engine light came on. diagnostics check said see a dealer or probable cause was output speed sensor. i replaced it myself and all good for over 2 years and 35000 miles and then it did the exact same thing again with the same diagnostic check (from auto zone)did i ever really fix the problem or just put a band aid on a bigger issue? And how bad would it be to drive the car in this condition?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Hyundai Accent 2001 (1,6 L) , does not start. HELP!!!

Problem solved. I had no choice, but to have the car towed to the
Hyundai dealer and at first they thought it was the ECM...
... (Because it had no sparks)
Which is very expensive, $800.00 in Canada...
But finally it was only the power relay of the ECM... $30.00... ouf!
Sometimes it can only be the ground wire, that goes into the car.

I'm posting this, so that if someone else has the same problem
maybe this will help you.

Have a nice day!

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Posted on Jul 30, 2008

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lebones337
  • 152 Answers

SOURCE: sensor 1 bank has an open circuit

it is the O2 sensor in the manifold that went bad. it is an easy fix but i wouid recommend taking in to somwere other than the dealer to save you money. this is small problem that will only effect your gas milage a little

Posted on Jan 02, 2009

  • 299 Answers

SOURCE: Replaced 0xygen sensor in 2003 Hyundai Accent 3 Times Not Fixed!

It sounds like you have either a lean or rich condition ocurring,could be exuast leak,vac leak,leaking fuel preasure regulator,cat convertor.At this point would go to dealer for diagnosis.

Posted on Jun 17, 2009

  • 47 Answers

SOURCE: check engine light flashing, car shaking and smells like gas

it could be anything have the code checked odds are it is a bad sensor

Posted on Sep 26, 2009

  • 1 Answer

SOURCE: 2001 Elantra stall, loss of power. Driving at

I am having the exact same problem with my 2001 Hyundai Elantra. I was told that the engine code that comes up when the sensor is on is called "Absolute Pressure In The Manifold". I was told by a "Hyundai Specialist" that when that code comes up it usually means that the seal on the manifold is Fuct. When my mechanic checked that out for me he had noticed that my manifold had 4 cracks in it(can varify cause he showed me). He replaced the manifold and gasket. The car ran fine for about 2-3 days and since then the problem has since come back and my check engine light will no longer go on/off it only stays on. Because of the check engine light always staying on I have noticed that on many occasions my car will hiccup many times in a row. The only way to stop the hiccup I have noticed is to take my foot right of the gas for approx. 2-3 sec then car will continue without hiccup(till it happends all over again). All in all I have been having this problem now for approx. 1 year and if there is somehow someway it could be repaired I would appretiate it.

Posted on Nov 06, 2009

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3 Answers

Transmission shifts hard, at times hard to get into gear


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next is a clutch problem nor disengaging properly--again a mount problem
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According to the database the code means OUTPUT SPEED SENSOR CIRCUT MALFUNCTION.

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There is no vacuum modulator valve , this transmission is all electrical controlled . What seams to be the problem ? no shifting , shifting hard ETC....... shift solenoid inside the transmission maybe , input or out put speed sensor bad . Do you have a check engine light lit ? There probably is a DTC - diagnostic trouble code .

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The Transmission shifts very hard after the first shift. Check engine light is on as well as the Green overdrive light blinks off and on. Speed sensor was cleaned and even replaced.


Your on the right track. Have you scanned the PCM, what codes did you get? If not and you changed the vehicle speed sensor,(VSS) did you check the (OSS) output shaft speed sensor, it will cause torque converter lock up and hard shifting and that pesky OD light flashing. I have also found that clutch packs inside auto tranny's dry out. Ford and some aftermarket companies sell a fluid that will recondition the clutch packs.

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2006 malibu ss traction light on and tranny shifting hard reset computer shifts fine


The error could be in transmission abs airbags or engine among others. As many modules these days is staggering. Suggest take it to dealer. Not many mechanic shops have the ability to check codes or repair suspension , airbag or other manufacturer specific design ed systems. And you will get much more knowledgeable mechanic. Could be as simple as wheel bearing loose, most prelevent cause, but without codes from computer making lights come on, were dead in water. Transmission in limp home mode makes me lead to guess, ya just a guess, to say you are missing a speed sensor. Signal. Now car will still start without crank sensor, tourque converter input speed sensor, trans output speed or any of the four abs wheel speed. Like I said loose wheel bearing causes mag pick up wheel speed sensor to miss counts, ad has predetermined amount of pulsed electrical signals it produces, when one not equal to others then pops code. Good luck write what code is found and where. Thx
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2001 kia optima v6 with fault codes p0720, u3600, and p1529 what do they mean?


I just know P0720 and P1529, the P0720 means "Output Speed Sensor Circuit" and the P1529 mean SCAIR Sloenoid Circuit Malfunction.

The Maxivideo MV301 tool 8.5MM is a new release code scanner.

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1 Answer

Transmission Problems on 2001 Elantra


what can i do to fix the output speed sensor

Jun 22, 2010 | 2001 Hyundai Elantra

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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1 Answer

Road speed sensor


So the diagnostic code says the speed sensor is bad in the transmission? Make sure all the wires are tight to the transmission and in good shape. If they are you probably need to replace the sensor. If the transmission controller doesn't get the correct speed values it would cause some problems shifting. Wiring to a transmission can cause faults since the wires are subjected to heat and vibration. If you can't find any problems with the wiring or the wiring connectors it just might be the sensor is bad (stuff fails).
I do have to say that I am not sure what G-68 means. The diagnostic codes are usually five digit numbers with maybe a letter.

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