Throttle Position Sensor

OklaHemi · Oct 31, 2010

so driving home my engine did a jerk and acted like it wouldn't shift down. im thinking oh **** there goes the tranny. the little red light in the lower left corner starts flashing. so i get home and check the manual and read the diagnostic. i get a p2138

throttle/ pedal position
sensor/switch
"D"/"E" voltage correlation

so i looked in my handy dandy chilton and found the throttle sensor on the throttle body, no sweat. im guessing this is a part i can get from either a dealership or advance auto. so my question after all that is there a difference in any? like a upgrade or something. one better than the other? thanks guys

shadow11 · Oct 31, 2010

I had to get a new TPS for my old truck and I was able to get it at Auto Zone. I think it was $40

txbass06 · Oct 31, 2010

I'd stay away from Autozone's electronics if they're still Duralast parts...

shadow11 · Oct 31, 2010

Oh and it was $100 at the dealer thats why i went with autozone

OklaHemi · Oct 31, 2010

i like advance auto. i dont know why i just do. ill swing by there tomorrow.

AF_Hemi · Nov 1, 2010

i like them cause they're ready in advance

Redtruck-VA · Nov 1, 2010

I've replaced my TB and there is no seperate TPS.
This is from the manual:
5.7L V-8
The 5.7L V-8 engine does not use a separate Throttle
Position Sensor (TPS) on the throttle body.

shadow11 · Nov 1, 2010

Redtruck-VA said:
Hey guys, on the 5.7 the TPS is part of the TB.

THROTTLE POSITION SENSOR
DESCRIPTION
The 3-wire Throttle Position Sensor (TPS) is
mounted on the throttle body and is connected to the
throttle blade shaft.
The 5.7L V-8 engine does not use a separate TPS
on the throttle body.

Time for a TB upgrade.......

I guess thats true cause my old truck was a 4.7 and it was separate from the TB.

truckin151 · Nov 1, 2010

If you gotta replace it get a fastman ported throttle body. Or i'll sell you my stock tb for $50 shipped, yoours is an 05' right?

OlDirtyJohn · Nov 1, 2010

maybe try to do the TPS recalibration first? before you start spending money? all itll cost you is about 5 min of your time. theres a tut around somewhere on it.

Redtruck-VA · Nov 1, 2010

It reads something like disconnect the battery for a couple minutes. I touch the cables together. Reconnect the battery and turn ignition on, but do not start for 10 seconds. Turn off then start.

OklaHemi · Nov 1, 2010

i have an 04

i have to replace the throttle body?

dammit man.

ill see if i can find the reset thing

glass3222 · Nov 1, 2010

Try resetting the TPS:

1) Insert ignition key and turn to "ON" (not start).
2) Wait for all idiot lights to go out. Check Engine Light may remain on.
3) Slowly depress the accelerator pedal all the way to the floor.
4) Slowly release the accelerator pedal until it's all the way back up.
5) Turn the ignition key to "OFF".
6) Start the engine.

Redtruck-VA · Nov 1, 2010

OklaHemi said:
i have an 04

i have to replace the throttle body?

dammit man.

ill see if i can find the reset thing

Just look at it as a opportunity to do a upgrade......

OklaHemi · Nov 1, 2010

[-The Fastman-] theFastman.com specializing in Dodge Performance Parts

so it looks to be a 272.00 upgrade. is it really worth it?

dealership wants 234.00 for a new one.

i guess i can try a salvage yard

OklaHemi · Nov 1, 2010

Redtruck-VA said:
Just look at it as a opportunity to do a upgrade......

i love those opps. do you think my burnouts have any thing to do with this?

OklaHemi · Nov 1, 2010

glass3222 said:
Try resetting the TPS:

1) Insert ignition key and turn to "ON" (not start).
2) Wait for all idiot lights to go out. Check Engine Light may remain on.
3) Slowly depress the accelerator pedal all the way to the floor.
4) Slowly release the accelerator pedal until it's all the way back up.
5) Turn the ignition key to "OFF".
6) Start the engine.

thanks. im going to take the throttle body out and clean it reall good(if i can reach it, still injured) then ill try this. if it doesnt work ill replace

Redtruck-VA · Nov 1, 2010

glass3222 said:
Try resetting the TPS:

1) Insert ignition key and turn to "ON" (not start).
2) Wait for all idiot lights to go out. Check Engine Light may remain on.
3) Slowly depress the accelerator pedal all the way to the floor.
4) Slowly release the accelerator pedal until it's all the way back up.
5) Turn the ignition key to "OFF".
6) Start the engine.

Rus,
Your procedure is for a diesel.....

The 5.7 procedure from the manual is:

(6) If the throttle body has been changed, the following
procedure must be performed:
(a) Disconnect negative battery cable from battery.
Leave cable disconnected for approximately 90
seconds.
(b) Reconnect cable to battery.
(c) Turn ignition switch ON, but do not crank
engine.
(d) Leave ignition switch ON for a minimum of
10 seconds. This will allow PCM to learn throttle
body electrical parameters.

AWE Daniel · Nov 1, 2010

Redtruck-VA said:
Rus,
This procedure is for a diesel.....

No this definitely works on our hemis, really needed to do it after i cleaned my TB. I can verify this works.

OklaHemi · Nov 1, 2010

i shall do both......

Throttle Position Sensor

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