Code p2127

Hello,

The code: P2127- Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage

When the ECM detects that the APP sensor 2 voltage is less than 0.16 volt it will trigger that code.
There is a good change the issue is wiring related.

https://www.2carpros.com/articles/how-to-check-wiring

I have attached the trouble shooting steps for the code P2127 below.

Please go through the steps as it can help you determine the issue.

Let me know of any questions.
Thank you.

Hi, just to jump in. Sometimes correlation faults like this will be due to dirty throttle body bores. The voltage may not update on the throttle fast enough from the gunk verses what the computer sees at the pedal.

I would start with a throttle body service first since it is the easiest and cheapest repair. If you can remove the throttle without unplugging it that would be even better. In fact, I would recommend you disconnect the battery as well. Here is a link on how to service it:

https://www.2carpros.com/articles/throttle-actuator-service


Let us know if this help.

I did a thorough cleaning of the throttle body. It was very dirty. (Would it being a former police car meaning excessive idle time cause extra buildup??) I disconnected it while cleaning it. Problem is that I managed to snap a bolt reinstalling it and somehow when one snapped the other snapped at the exact same time. It's now only held on with the 2 bottom nuts over studs sticking out from the engine block. On top of those go the two fuel rails(?) followed by two more nuts. How do I go about getting the snapped bolts out? How big of a deal will it be? I think they're flush with the block. On the positive side of things, it's not throwing any codes now so hopefully it solved the issue. No way to tell for certain without giving it sometime though. How do I get the car to relearn the throttle body defaults though? It's now idling well at around 650-750-RPMs. Think it used to be around 850 before. Problem is that as soon as I release the brake it goes forward a lot more aggressively than in the past. Think it gets to around 10-MPH without any throttle given.

Remove the throttle body to get access to the broken studs. If they are flushed with the intake you would need to rent an extractor kit from your local parts store to drill them out.

As for the idle, looks normal but at this point you would need an advance scanner tool to do an idle relearn just to make sure, If that doesn't work then you would need to have software downloaded to relearn the idle.

I was able to extract the broken bolts with just some pliers luckily. Got new bolts and tightened it down. Seems to have fixed the check engine/error code p2127 Throttle Pedal Position Sensor. Problem is that since doing it I appear to be getting sporadic MPG. Some drives I'll get as high as 19-20 MPG. Others I'll get as low as 14. This is all city driving. I used to get 18-19 although I was still on the low end before. Could this be a problem still with the throttle body? The engine has been idling smoothly. I've now replaced the air filter and cleaned the throttle body. I still have to do the MAF sensor. Didn't have the spray before. What else can it still be? If the engine was misfiring it would throw a code, or I'd be able to tell? The spark plugs are due to be replaced soon I believe. Is that the only other possibility? It's a V6 with the back 3 plugs having next to no access. How do I get access to them?

Also, right after doing the throttle body cleaning my ABS light started blinking on all the time. Is it just a coincidence that it happened right afterwards? I'm assuming the sensor or the whole wheel bearing has to be replaced. Is it possible or worthwhile to replace only the sensor? And any way to figure out which one it is without going to the mechanic for his scan tool? My basic OBD scanner doesn't do ABS.

Thanks.

The MAF sensor can impact the gas mileage, if it is sending incorrect data to the ECM. This might require a scanner that can read live data. Which can help determining the reason of why you are having this issue.
Have you tried to clean the MAF sensor?

https://www.2carpros.com/articles/mass-air-flow-service

So, after cleaning the throttle body and the MAF sensor the check engine light stayed off for a few months. It just came back. Same code P2127. What's the next step? I already replaced the gas pedal. Should I replace the throttle body or is it probably wiring related?

It could be wiring related. Best step would be to run thru the trouble shooting guide. If you would look at the first reply to this post, you will see the diagnostics steps are attached for the P2127 code.

Go through those steps to isolate the issue.
Let me know what you find.