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Shifting hard and codes P0700, P0716 and P0717

Tiny
ADAM SACKLER
  • MEMBER
  • 2007 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Yea, my check engine light came back on. I have not gone to get the codes checked, but every time I get them checked it is the same codes; P0700, P0716, and P0717 and I have replaced all of the sensors. Previously I have replaced the throttle body with sensor, the transmission input sensor, and I replaced the gas pedal with sensor and I also replaced the connectors to the sensors in case of wiring going bad. I unplug the battery when I work on it, so the codes clear and it drives better for a short amount of time but then starts shifting hard again and throws the same codes. So I'm thinking at this point it would be the transmission control module?
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Monday, November 4th, 2019 AT 12:38 PM

45 Replies

Tiny
KASEKENNY
  • MECHANIC
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If in fact you have the same codes, we do need to look for a common denominator. The TCM would be a common component so we need to jump to that and test it to make sure that is the issue. Take a look at the attachments and I highlighted the test for the TCM.

Let me know your results and we can go from there. Thanks
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Tuesday, November 5th, 2019 AT 3:32 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
I have already replaced the transmission input speed sensor though, along with the throttle body and sensor, as well as the accelerator pedal with sensor, and wired in new connectors for the transmission input speed sensor and the throttle body sensor in case the wiring might be bad. The only thing out of those I have not replaced yet is the TCM.
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Tuesday, November 5th, 2019 AT 4:53 PM
Tiny
KASEKENNY
  • MECHANIC
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There is always a chance that we got a bad part but I am with you and I would go ahead and replace the TCM. Just be aware you will need to program the new TCM using a scan tool.
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Tuesday, November 5th, 2019 AT 6:53 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Yea, unfortunately I don't have a flasher so I have to pay way more than I paid for the part for them to let the machine do a half an hour of programming, but it is what it is. I just got the part in today so I will update you after I have it in if the hard shifting has gone away or not.
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Sunday, November 10th, 2019 AT 3:19 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
I am pretty sure I have seen the TCM when I have been replacing other parts on the car. But I am having trouble finding any literature or videos showing the location of it. It's in the front of the car right? On the driver's side basically in parallel with the serpentine belts (as far as location) next to the empty battery tray?
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Sunday, November 10th, 2019 AT 3:48 PM
Tiny
KASEKENNY
  • MECHANIC
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Not a problem. Here is the procedure. Its pretty light on details but shows a pretty good picture.
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Sunday, November 10th, 2019 AT 6:50 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Okay, thanks. That is where I thought I had seen it at. Just wanted to make sure.
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Monday, November 11th, 2019 AT 6:21 AM
Tiny
KASEKENNY
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No problem. Please let us know if you need anything else. Thanks
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Monday, November 11th, 2019 AT 6:57 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Is it normal for the car to act weird after the TCM is programmed. When I drove it home from the shop that programmed it, the car drove great. Then this morning when I was driving down the road, the check engine light suddenly came on, my stabilitrak was off/said service stabilitrak, and it said I was losing engine power and I couldn't drive over like 20 mph. I got the codes checked and it was throwing codes for the throttle body and accelerator pedal, but I have recently replaced both of those along with the sensors. So I unplugged the battery to reset the codes and it happened again when test driving it. I reset the codes a second time and now it is driving fine. So I'm not sure if that is normal or if I may have another problem.
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Tuesday, November 12th, 2019 AT 10:19 AM
Tiny
KASEKENNY
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You could have another issue. Clearly this is not normal after the TCM is programmed but it sounds like the throttle needed to be relearned. If the vehicle is driving fine, then clearly we don't need to do anything with it right now.

IF it acts up again, get the codes and send them to me before you reset it. Hold off on clearing them until we can get a handle on what may be happening. Thanks
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Tuesday, November 12th, 2019 AT 7:12 PM
Tiny
ADAM SACKLER
  • MEMBER
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Okay, thank you. I was not thinking it was normal but was confused it was giving me codes for parts I had recently replaced. I will let you know if it happens again. Thank you.
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Tuesday, November 12th, 2019 AT 7:17 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
It happened again this morning, there is two different codes but a total of 4. C0242 and P2135 (Ã 3).
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Wednesday, November 13th, 2019 AT 6:10 AM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Do you think I have a bad engine control module?
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Wednesday, November 13th, 2019 AT 6:55 AM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Or a bad PCM? I know these modules rarely fail, but I am not sure what else the problem would be. The parts for the other codes were recently replaced.
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Wednesday, November 13th, 2019 AT 9:16 AM
Tiny
KASEKENNY
  • MECHANIC
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So it looks like these are new? If so, I think you have a wiring issue assuming each of the components have been replaced. Maybe you told me but have you replaced the throttle body? Even if you have, if you look at the chart for P2135, it says that this code is set when there is high resistance. Clearly this doesn't tell you where but it tells you what you need to focus on when testing these circuits.

What wiring repairs have you made to this point? I would unhook the wiring from the throttle body to the ECM and measure resistance on these wires.
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Wednesday, November 13th, 2019 AT 6:50 PM
Tiny
ADAM SACKLER
  • MEMBER
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Yes, I have replaced the throttle body with new sensor, accelerator pedal that came with sensor, and transmission input sensor.I also wired in new connectors for the throttle body and the transmission input sensor. There is only the one connector for the throttle body so what wires do I need to check. And yes, these are new codes, before I replaced the TCM the codes coming up were P0700, P0716, and P0717. After I replaced the TCM these codes came up C0242 and P2135 (x3).
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Wednesday, November 13th, 2019 AT 7:42 PM
Tiny
ADAM SACKLER
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All of the resistance readings for both the throttle sensor and the ECM were overloaded except for the ground on the throttle sensor was at 1 ohm. The voltage test on the reference terminal 3 of the ECM was less than 1 volt. The throttle sensor voltage would jump up quickly to 2.5 volts then go back to 0.
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Thursday, November 14th, 2019 AT 10:40 AM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
So what does this mean and what do I need to do to fix it? I wasn't able to visually inspect the ECM circuit board to see if it was damaged because it had a sealant around the edges. After disconnecting the TPS and ECM/PCM connectors to do the voltage/resistance readings and plugging them back in the car is driving horrible again, it died when I tried to start it the first time, stabilitrak/traction control warnings are back on, and it is shifting hard. Hoping to get this fixed ASAP.
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Thursday, November 14th, 2019 AT 3:27 PM
Tiny
KASEKENNY
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When you say the resistance readings were "over load" do you mean your meter said "OL"? If this is the case then that means out of limit, in other words, you have an open. So if you unhooked from the ECM and the throttle body and measured the resistance on the same wire it is was open then that is your issue. You need to have continuity or less than 1 ohm of resistance. If you have an open on these wires that means the wire is broken or you were not on the same wire.

If you look at the wiring diagrams, you need to measure each wire one at a time from end to end.
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Thursday, November 14th, 2019 AT 6:35 PM
Tiny
ADAM SACKLER
  • MEMBER
  • 45 POSTS
Yes I meant OL.I grounded the negative prong on the car battery negative and used the positive prong to measure each wire individually. All of the wires read OL except for the ground which was at 1 ohm. And like I said earlier, the voltage readings on the throttle body jumped up to 2.5 volts and went back to 0.
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Thursday, November 14th, 2019 AT 6:56 PM

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