Symptoms of a Bad or Failing Transmission Speed Sensor

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Cost of Replacing a Bad or Failing Transmission Speed Sensor

Common signs include harsh or improper shifting, cruise control not working, and the Check Engine Light coming on. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Transmission Speed Sensor Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2007 Chevrolet Impala $231 $21.09 $210.00 32% $343.59
2012 Chevrolet Silverado 3500 HD $107 $36.79 $70.00 25% $144.29
2004 Hyundai Tiburon $147 $77.28 $70.00 20% $184.78
2014 Audi A4 $215 $109.65 $105.00 20% $270.90
2009 Infiniti FX35 $391 $124.71 $266.00 26% $533.21
2003 Jaguar Vanden Plas $91 $21.09 $70.00 29% $128.59
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How to Diagnose a Bad or Failing Transmission Speed Sensor?

transmission speed sensor

The transmission speed sensors are used to calculate the actual gear ratio of the transmission while in use. There are generally two speed sensors that work in conjunction to provide accurate transmission data to the vehicle’s powertrain control module. The first is known as the input shaft speed (ISS) sensor. As described, this sensor is used to monitor the speed of the transmission' input shaft. The other sensor is the output shaft speed (OSS) sensor. If either of these two sensors falls out of alignment or experiences electrical issues, it impacts the operation of the entire transmission.

After registering data, the two transmission speed sensors, also commonly referred to as a vehicle speed sensors (VSS), send data to the powertrain control module (PCM), which compares these two inputs and calculates which gear the transmission should engage for efficient driving. The actual gear ratio is then compared to the desired gear ratio. If the desired gear and the actual gear do not match, then the PCM will set a diagnostic trouble code (DTC) and illuminate the Check Engine Light.

Should either or both of these speed sensors fail, you may notice one or more of the following issues:

1. Harsh or improper shifting

Without a valid speed signal from these sensors, the PCM will not be able to correctly control the shifting of gears within the transmission. This may cause the transmission to shift roughly or more quickly than normal. It's also common that a problem with these sensors can impact the shift timing, extending the interval between transmission shifts. An automatic transmission is hydraulically controlled and designed to shift smoothly. When the transmission shifts hard, it can damage internal components including valve bodies, hydraulic lines, and in some cases mechanical gears. If you notice that your transmission is shifting harshly or roughly, you should contact a local ASE certified mechanic as soon as possible.

2. Cruise control does not work

Since the transmission speed sensors monitor the input and output shaft speed, it also plays a part in monitoring the cruise control. When the sensors fail to deliver accurate data to the onboard computer on your car, truck, or SUV, the powertrain control module (PCM) will send an error code to the vehicle’s ECU. As a safety precaution, the ECU will shut down the cruise control and render it inactive. If you notice that your cruise control does not engage when you press the button, contact a mechanic so they can inspect the vehicle and determine why the cruise control is not working. It may be due to faulty transmission speed sensors.

3. Check Engine Light comes on

If the signals are lost from the transmission speed sensors, the PCM will set a DTC and illuminate the Check Engine Light on the vehicle dashboard. It also can indicate that there is an increase in tailpipe emissions is occurring that surpasses acceptable limits for environmental contaminants from motor vehicles.

In any case, if you notice that the Check Engine Light comes on, you should contact a local mechanic to scan the error codes and determine why the Check Engine Light is illuminated. Once the problem has been fixed, the mechanic will reset the error codes.

If the problem rests with the speed sensors, depending on your particular transmission, the professional ASE certified mechanics from YourMechanic.com may be able to replace the sensor. Some speed sensors are internal to the transmission and will require the transmission to be removed from the vehicle before the sensors can be replaced.

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Jerimiah

16 years of experience
173 reviews
Jerimiah
16 years of experience
If you want fantastic service from a knowledgeable automotive expert, Jerimiah is the person for you. He was in and out in about a half an hour, and in that short amount of time earned my trust and my repeat business if anything else happens to my vehicles. Thanks Jerimiah! You rock!
2006 HONDA CIVIC - TRANSMISSION SPEED SENSOR REPLACEMENT - HENDERSON, NEVADA

Patrick

8 years of experience
68 reviews
Patrick
8 years of experience
My Dodge Charger was shifting real hard so I wasn’t able to drive for months because of what dealers and mechanic shop wanted to charge me. So I finally came across this site and read reviews about mobile mechanics and they were good so I took the risk . Patrick came down and did what he does best and brought my car back life and on the road . Very professional at his job and hands down to you I really recommend everyone for your services. Thanks bud my wife is excited to have her car back on the road and I for got to mention but the price for the job was very reasonable best price
2012 DODGE CHARGER - TRANSMISSION SPEED SENSOR REPLACEMENT - PHOENIX, ARIZONA

Brandon

15 years of experience
229 reviews
Brandon
15 years of experience
Very quick and was able to diagnose another problem just by listening to the engine. I think Brandon is a great mechanic.
1999 DODGE RAM 1500 - TRANSMISSION SPEED SENSOR - STONE MOUNTAIN, GEORGIA

Jeffrey

24 years of experience
624 reviews
Jeffrey
24 years of experience
Though I was not at home when he arrived My wife and daughter gave Him High praise for his punctuality and professionalism ... Also, je was able to solve the check engine light problem which has plagued My daughter's car for years now... Thanks So very much... I'll be using your services again soon... 
1997 TOYOTA AVALON - TRANSMISSION SPEED SENSOR - CHARLOTTE, NORTH CAROLINA

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