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Old 10-19-2021, 05:05 AM   #1
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Question Throttle pedal response

Just starting the rv kick. Bought a 2015 suncruiser a ford chassis. Anyone having issues with throttle pedal response. I have it at a truck shop now they inexperienced with gas drive by wire systems. I'm getting a p2138 code. Trying a throttle position sensor, a throttle pedal. The shop tried a throttle body. none are taking care of the problem. Looking for someone who has had a similar problem.
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Old 10-20-2021, 10:46 AM   #2
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Fuel Pressure/ fuel filter/ fuel pump? No gassy= no go; but if NOT the sensor, maybe rodent damaged wiring to the sensor?
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Old 10-20-2021, 10:51 AM   #3
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The power cord to the accelerator can be loose.
It should be tight and locked.
Believe me I know this first hand.
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Old 10-20-2021, 11:08 AM   #4
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What are the symptoms you are experiencing (if any, other than the P2138 code of course)? One item you didn't mention having done is to recalibrate the throttle pedal. I would do that before making any other changes.

I would suggest to lookup the procedure for yours as it could be different than what I am sharing here, but the process is this for many Fords.

1) Key on with engine off
2) Wait a few moments for the system to come online and gauges settle down.
3) Press the throttle pedal to the floor in one slow smooth operation (5~10 seconds)
4) Once the pedal is on the floor, let it go (take your foot off of it).
5) Turn off the key and wait ~5 seconds.

Your pedal should now be calibrated. I have read from others that doing this several times helps, others state to only repeat this procedure if the process did not work or the problem (code or otherwise) continues. So, I would do it once, clear the code, and drive it and see if there is any difference, if the code reappears I would repeat the procedure at least 3 times and only after that would I dig deeper into other causes (such as a poor electrical connection to the pedal or PCM module). ~CA

BTW, I just noticed this is your first post so, Welcome to the IRV2 Forums.
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Old 10-21-2021, 09:23 AM   #5
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Make sure the parking brake is off when driving. That has been an issue for some in the past. Any slight engaging of the electrical indication switch will cause the drive by wire to not work correctly when actually driving.
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Old 10-21-2021, 09:30 AM   #6
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Can you be more specific with the symptoms it's causing? I had an issue with mine where it would only sometimes hesitate when accelerating from a stop or near stop, but mine never threw a code, so it's possibly not the same issue.

These beasts also have a Pedal Position Sensor, which is not the same as a Throttle Position Sensor. The pedal sensor is actually part of the pedal assembly inside, and is darned easy to change, once you get squeezed into the space so that you can reach the bolts holding it in. Changing this didn't cure my problem, but I was surprised to find that it was even a thing.
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Old 10-21-2021, 11:15 AM   #7
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It's interesting that the system says the OP has zero posts. Apparently the post we see above never happened, must be a CIA guy.
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Old 10-21-2021, 03:07 PM   #8
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Quote:
Originally Posted by Podivin View Post
It's interesting that the system says the OP has zero posts. Apparently the post we see above never happened, must be a CIA guy.
Oh yea... I didn't catch that. Weird
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Old 10-22-2021, 08:25 AM   #9
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When pressing the gas pedal I have very little response I had to feather the pedal to get a response. First tried tps, then the throttle pedal. And tried to do pin point tests (which was above my skills) so brought it a repair shop and they tried a throttle body. And still no change. It always setting a P2138 code.
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Old 10-24-2021, 10:10 PM   #10
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P2138 will not be cured by a throttle body, throttle body is on the OUTPUT side of the pcm, the issue is on the INPUT side to the pcm, throttle pedal assy, or wires/circuits going TO the pcm, when the P2138 sets it also sets the wrench light, not the check engine light.
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Old 10-24-2021, 10:15 PM   #11
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If throttle pedal assy was changed, then it a wire issue, possible rodent damage. Or connector pin out/pushout condition. It is also very rare that it is a pcm issue, if it is oem stock condition, no modifications, no programmers have been installed and no welding done on the chassis.
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