I have a '05 F150 5.4L and I'm getting a wrench light code P2106 and code p2135 accelerator pedal position sensor switch a b voltage correlation.It happened once and when I drove it the next day everything was fine Do I have to replace both the throttle position sensor and the throttle body?Also will the power train control module need to be reprogrammed to the latest calibration?Has anyone just changed the TPS and it worked without reprogramming?This only happened once but we use this truck for towing our camping trailer and I would hate for this to happen towing our trailer.Thanks

 

TSB 05-14-4
07/25/05
WRENCH LIGHT ON WITH BOTH DTC P2106 AND
P2135 - VEHICLES BUILT 11/29/2004 AND PRIOR FORD:
2003-2005 Thunderbird
2005 Crown Victoria, Mustang
2004-2005 Explorer, F-150
2005 E-Series, Expedition, F-Super Duty LINCOLN:
2003-2005 LS
2005 Town Car, Navigator MERCURY:
2005 Grand Marquis
2004-2005 Mountaineer This article supersedes TSB 05-09-15 to update the Issue and Dealer Coding.
ISSUE
Some vehicles built 11/29/2004 and prior may exhibit the wrench light on with both P2106 and P2135 diagnostic trouble codes (DTCs). ACTION
Replace the throttle position sensor (TPS) following the instruction sheet included in the TPS service kit. Reprogram the powertrain control module (PCM) to the latest calibration using WDS release B36.11 and higher, or B37.2 and higher. This new calibration is not included in the B37 CD. Calibration files are also available at the website. CAUTION FAILURE TO FOLLOW THE TPS REMOVAL AND INSTALLATION PROCEDURE WILL RESULT IN DAMAGE TO THE TPS SCREWS.

 

OK but is that for '04s and prior,mine is a '05 and if it does need reprogramming will I have to go to dealer $$$$.

 

It is for "2004-2005 Explorer, F-150" as well. I just had this on one last month, the TP sensor is updated, buy a Ford one not from vatozone or any aftermarket parts house. you'll need to have your PCM updated also.

 

Thanks Shawns Ford for your help and I definitively will be getting a Ford part.I looked at the label on my drivers door and my truck was built on 6/2005 not the 11/29/04 and prior which means I will not have to have my PCM updated.Thanks again

 

I guess if you cant update it then you cant. I update each one whenever I touch it. Well I did. No longer a tech as of last Friday.

 

My truck had been having idle issues. Coming to a stop it would idle down really low and stall and then when restarted it would idle high (1000-2000 RPM). After a couple of drive cycles it would go back to normal and I wasn't getting any codes. I checked for vacuum leaks, cleaned the TB and MAF but continued to have the problem.

It just got worse yesterday and the wrench light and check engine light came on. I checked for codes and found P2106 AND
P2135. Looking at this thread I'm pretty sure it is the TPS that needs to be replaced. Since some have had trouble removing the old TPS without breaking the screws I decided to order a throttle body. Will I need to have the computer flashed with the update or is that only if the TPS is replaced on its own?

 

I answered my queston. I replaced the throttle body and it was still idling high, so I took it to the dealer and had the pcm reflash done. Now it runs great!

 

I solved them on my truck.
My conclusion is that those codes are a consequence of other small defects.
Advice: buy a small 70$ pocket scanner to have it in the truck and scan when needed
First, you need to answer yourself to these questions:
- are spark plugs in good condition? - if not, replace them with genuine Motorcraft; are the contacts ok?
- are the wires going to spark plugs in good condition? - if not, replace them with Motorcraft
- are contacts with 6 coils box in good condition? - check and clean them
- from spark plugs to coil box, are the wires crossing each other ? if yes, re-arrange each wire from its spark plug to its coil through a NORMAL path, not allowing to cross each other ! [that's because each wire create an electro-magnetically field. If these fields are crossing each other, they will send fake signal to PCM !] Of course, you need to maintain the correct number of cylinders when connecting wires.
- are the wires going to oxygen sensors in good condition and connections are ok?
- are all the wires going to TPS and Throttle body in good condition and not fried? are all the connectors ok?
- is it throttle body clean ? if not, you need to remove inside the carbon excess with a CRC spray for electric parts and a thin rag [see helpful videos

You Tube

]
- is it air filter clean? if no, replace it
- do you have any air leaks on the path to Throttle body? - if yes, must be eliminated
- is your MAF sensor clean? => I think not. You need to clean it with a CRC spray for electric parts. First, disconnect battery at minus pole, in order to be safe and to erase the codes. Then, you need to take out the tube with MAF. Separately, spray on MAF 2-3 times, without touching it. Let it dry for 10 min. Then, put them back on truck and connect battery. See this helpful video :

You Tube

So, any miss function on these paths may conduct to a fake signal to PCM.
PCM will convert bad electrical signal received to a bad code.

Additional: is your PCM re-flashed with latest software issued by Ford? - if not, go to dealer and do it

You may note: if all above conditions are achieved and TB codes was not solved, then you need to take in consideration, using Motorcraft parts :
- change TPS and then test the truck
- then change full Throttle body and then test the truck
- at least, change PCM
Hope it was helpful. K.