Code P0716 P07BF Input speed sensor

[tjharper]

I have a 2012 Buick Verano 2.4l with sunroof. I was driving home from work a week ago and at a stop light the check engine light comes on. I tried to accelerate and felt the vehicle went to limp mode. The vehicle would barely move. The rpm`'s would go up to about 3000 rpm but no more even if I floored it. The car would get going but after a long slow hesitation. I noticed from complete stops the vehicle would barely move if I floored the accelerator. The rpm's would go up revving it like crazy and the car would go. Even worse on hills. Eventually I got the car home. The following morning I was going to have the car towed to a shop. I got In and started the vehicle after sitting all night and the check engine light was on but it ran and drove fine. No problems. Well at least until it got to operating temp around 185 degrees then I started having the same symptoms. It was 6 in the morning so reluctantly drove it to the shop 5 miles away. It sat for 5 hours before the mechanic looked at it. Again he started it. It drove fine for a few mins till it got to operating temperature and the limp mode symptoms happened again. Anyway he pulled the code it was P0716 Input speed sensorsensor low voltage. So he changed the input speed sensor located on the driver side of the trans behind the left front wheel which was a lengthy repair. The sensor sits on the outside of trans case but plugs to trans control module inside trans Involving moving battery , trans cooler lines and valve body cover . After that repair . He thought it was fixed but after driving it about a mile the same code re appeared. Another mechanic took over. He monitored the sensors and he said both the input and out put speed sensors were working fine . He said my problem was electrical , possibly the engine wiring harness or possible PCM needing to be reflashed or replaced and to take the vehicle to another shop that works on GM vehicles because they only specialize on Asian vehicles. They also said that I have a sunroof and with all the rain we have been getting in Los Angeles that water could have gotten in one of the front sunroof drain ports and shorted something out. It's weird that when the vehicle only gets to operating temp that this happens but ok after sitting for hours. Any one ever have this issue ? I purchased this vehicle new 7 years ago and only have 66,000 miles on it. I keep it very well maintained and serviced. No warranty left.

 

[tjharper]

I have a 2012 Buick Verano 2.4l with sunroof. I was driving home from work a week ago and at a stop light the check engine light comes on. I tried to accelerate and felt the vehicle went to limp mode. The vehicle would barely move. The rpm`'s would go up to about 3000 rpm but no more even if I floored it. The car would get going but after a long slow hesitation. I noticed from complete stops the vehicle would barely move if I floored the accelerator. The rpm's would go up revving it like crazy and the car would go. Even worse on hills. Eventually I got the car home. The following morning I was going to have the car towed to a shop. I got In and started the vehicle after sitting all night and the check engine light was on but it ran and drove fine. No problems. Well at least until it got to operating temp around 185 degrees then I started having the same symptoms. It was 6 in the morning so reluctantly drove it to the shop 5 miles away. It sat for 5 hours before the mechanic looked at it. Again he started it. It drove fine for a few mins till it got to operating temperature and the limp mode symptoms happened again. Anyway he pulled the code it was P0716 Input speed sensorsensor low voltage. So he changed the input speed sensor located on the driver side of the trans behind the left front wheel which was a lengthy repair. The sensor sits on the outside of trans case but plugs to trans control module inside trans Involving moving battery , trans cooler lines and valve body cover . After that repair . He thought it was fixed but after driving it about a mile the same code re appeared. Another mechanic took over. He monitored the sensors and he said both the input and out put speed sensors were working fine . He said my problem was electrical , possibly the engine wiring harness or possible PCM needing to be reflashed or replaced and to take the vehicle to another shop that works on GM vehicles because they only specialize on Asian vehicles. They also said that I have a sunroof and with all the rain we have been getting in Los Angeles that water could have gotten in one of the front sunroof drain ports and shorted something out. It's weird that when the vehicle only gets to operating temp that this happens but ok after sitting for hours. Any one ever have this issue ? I purchased this vehicle new 7 years ago and only have 66,000 miles on it. I keep it very well maintained and serviced. No warranty left.

Ok . Turns out it was the TCM / Transmission Control module. The tcm was lowering the voltage to the In put speed sensorsensor when the vehicle reached around 185 degrees putting it into limp mode. This is not a repair for a do it your selfer and it wasnt cheap to fix. I have and automotive background so I did it my self. The part sits inside the trans piggybacking the valve body. The part was $560.00 with $100.00 core you get back when returned plus the 4 qts. Of Dexron VI . You have to program the part to the car as well and using GM software is highly recommended. I paid $43.00 for the software access from the GM website and I had to re program the ECM as well as the program TCM. It also updated other modules that had updates available. Again I did this in my friends shop . He has all the tools and diagnostic equipment stuff. My total was about $645.00 but other shops wanted to charge me between $1200.00 and $1400.00 . The dealer wanted $2100.00. Note Dorman makes a cheaper TCM for around $265.00 with a $300.00 core but I hear those suck and last on average a year or two if that. Anyway hope this helps anyone out there with a similar issue.

 

[KevinJ]

Thank You tjharper for doing the follow up post on your problem. It's nice to know what the resolution finally is for a specific problem.

 

[G-568847]

I have a 2012 Buick Verano 2.4l with sunroof. I was driving home from work a week ago and at a stop light the check engine light comes on. I tried to accelerate and felt the vehicle went to limp mode. The vehicle would barely move. The rpm`'s would go up to about 3000 rpm but no more even if I floored it. The car would get going but after a long slow hesitation. I noticed from complete stops the vehicle would barely move if I floored the accelerator. The rpm's would go up revving it like crazy and the car would go. Even worse on hills. Eventually I got the car home. The following morning I was going to have the car towed to a shop. I got In and started the vehicle after sitting all night and the check engine light was on but it ran and drove fine. No problems. Well at least until it got to operating temp around 185 degrees then I started having the same symptoms. It was 6 in the morning so reluctantly drove it to the shop 5 miles away. It sat for 5 hours before the mechanic looked at it. Again he started it. It drove fine for a few mins till it got to operating temperature and the limp mode symptoms happened again. Anyway he pulled the code it was P0716 Input speed sensorsensor low voltage. So he changed the input speed sensor located on the driver side of the trans behind the left front wheel which was a lengthy repair. The sensor sits on the outside of trans case but plugs to trans control module inside trans Involving moving battery , trans cooler lines and valve body cover . After that repair . He thought it was fixed but after driving it about a mile the same code re appeared. Another mechanic took over. He monitored the sensors and he said both the input and out put speed sensors were working fine . He said my problem was electrical , possibly the engine wiring harness or possible PCM needing to be reflashed or replaced and to take the vehicle to another shop that works on GM vehicles because they only specialize on Asian vehicles. They also said that I have a sunroof and with all the rain we have been getting in Los Angeles that water could have gotten in one of the front sunroof drain ports and shorted something out. It's weird that when the vehicle only gets to operating temp that this happens but ok after sitting for hours. Any one ever have this issue ? I purchased this vehicle new 7 years ago and only have 66,000 miles on it. I keep it very well maintained and serviced. No warranty left.

I have same problem 2013 buick Verano

 

[Jaywan005]

I have a 2013 Chevy Malibu with a 2.5l engine.
I am currently experiencing the exact same issues that you experienced. I changed the input and output speed sensors(did both because I already had the trans took apart anyways)
But when I was done putting it back together and started driving, around operating temp it went into limp mode again. Plugged in a scanner and was saying low voltage input speed sensor.
So I’m pretty sure it’s the same issue that you had. But I’m wondering, if I was to change the tcm myself would I just be able to take it to a certified gm mechanic to have it programmed? And a follow up question would it have to be done when it’s already installed or before you install it? Thank you in advance

 

[Cdrive]

I had the same problem on my 2013 Buick Verano. Dealer said I needed a new transmission for $7000. I put the TEHCM in my self and brought back to same dealer for reprogramming. I wasn’t too happy that the dealer couldn’t do accurate diagnostics. I had to pay them for the worthless diagnostics $160 and for reprogramming the new TEHCM $160. This forum really helped me allot and if you have these same codes and symptoms it’s a good chance it’s your TEHCM.

 

[Cdrive]

I had the same problem on my 2013 Buick Verano. Dealer said I needed a new transmission for $7000. I put the TEHCM in my self and brought back to same dealer for reprogramming. I wasn’t too happy that the dealer couldn’t do accurate diagnostics. I had to pay them for the worthless diagnostics $160 and for reprogramming the new TEHCM $160. This forum really helped me allot and if you have these same codes and symptoms it’s a good chance it’s your TEHCM.

Also to let people know, when the car goes into limp mode you have R and 5th only. You can drive like that to get home and get to the shop. It’s not great but you will get there just fine. When you replace the TCM it will automatically be in limp mode until you get it programmed.

 

[horrorRadio]

Had same problem with 2012 Cruze. My problem was that the sealed TCM chipset was full of transmission fluid causing loss of signal to the input speed sensor when reaching operating temperature. Draining and drying could potentially fix the issue but not sure since I had already purchased a used TCM from same year/model at salvage yard which surprisingly worked well without the required flashing.