Skip the auto shop - Our mechanics make house calls

Q: Speedometer not working

asked by on

I have two codes popping up from the engine light. P0720 and P1529. Is this a serious problem or is it just the speedometer? I think I just need a speed sensor replacement but I would like to make sure. I stopped driving it in fear of more damage. When I try to accelerate, it gave me a thud after slowing down and it doesn't make a sound when I stop at a stop light. It takes a long time to move and speed up.

My car has 206000 miles.
My car has an automatic transmission.

A: Hello there, you are correct. Both of the c...

Hello there, you are correct. Both of the codes on your 2001 Hyundai Elantra can relate to the speedometer. The P0720 code is for output speed sensor circuit fault, this can be caused by a faulty speed sensor, a wiring harness fault, or a failing speedometer. The P1529 code is more general and refers to a transmission control module fault present. Your vehicle will still need to be diagnosed to properly determine what the root cause is. A qualified technician, such as one from YourMechanic, will be able to inspect the Check Engine Light so that you can proceed with the proper repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Accelerating problem.

If you are having an acceleration problem then you should first have the computer diagnosed to see if the throttle position sensor is not stuck at idle position. The throttle is electronically controlled and will not allow acceleration if there...

Q: Where is the multi box?

The multi box is an extra storage compartment, located directly in front of your shifter. To open the multi box, lift the lever on the box’s lid up.

Q: Codes P2106 and P0720

Hi, thanks for writing in. Code P0720 is for the output speed sensor for the transmission, and code P2016 is for the throttle control actuator in failure mode and may be due to the transmission codes. The system will need...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...