2008 - Replace Accelerator Pedal or ??

Please ask your shop for the actual, exact trouble codes they are seeing, and post those here. A trouble code is five characters, where the first is a P, C, B, or U, the next is a 0, 1, 2, or 3, and the rest can be any digit 0 through 9 or letter A through F.

A Prius has sensors both on the accelerator pedal and on the throttle itself (two sensors, for redundancy, in each place), and there are codes about one and codes about the other, and they all look similar and they all have similar descriptions that start "throttle / pedal position sensor / switch", and people mix them up all the time. It's no fun replacing the wrong thing.

Here is a post you can refer to for more information.

 

Since this is rarely posted as a problem, I would think there would be plenty of used parts available. All will be somewhat reliable, due to the rare failure occurrences that are listed on this forum.

In fact I might have one for sale LOL

 

Pretty sure this has shown up several times previously and is always a misunderstanding of the DTC.

 

X2 for having the actual trouble code(s).

A (not uncommon) scenario is to have a P1121, which many "generic" scantools or google defines as a fault with throttle or accelerator position sensors.

On a Gen 2 Prius, that (manufacturer specific) code points to a common fault with the coolant control valve.

Posted via the PriusChat mobile app.

 

Um, there's no connection between any of those codes and the accelerator pedal in a gen 2 Prius.

P1116 is about the temperature of coolant coming out of the coolant heat storage system "thermos" not being as expected.

P1150 means the car thinks the coolant heat storage system might have a clog preventing coolant flow.

P1121 means the position sensor on the coolant control valve isn't responding as expected when the car tries to change the valve position.

If the valve really isn't changing positions when it should, that could explain the P1150 and P1116 also. So, I would start by troubleshooting the P1121:

https://attachments.priuschat.com/attachment-files/2019/12/178524_DTC_P1121.pdf

... at a shop that doesn't try to tell you these are pedal codes ....

 

He did not send you the wrong codes. He sent you exactly what we were expecting, because we've seen it multiple times.
Please see post #4.

OR, let him replace all your pedal parts, then he'll probably want to swap the throttle body, and then you'll be complaining about spending a thousand bucks and still having the same codes.

The cooling valve failure is VERY common on the gen 2.

 

You know the inverter cooling water pump and the flow control valve are two different cooling systems? They have no interaction with each other? Those codes have 0 to do with the inverter cooling system.

If they're replacing the coolant pump just because they're in that area already doing the valve, for $132 in parts it sounds like they're using chinese counterfeit components.

 

I'm very curious as to what they're actually installing, because inverter cooling pumps at advance are around $220 and the control valve is a bit less than a hundred if I remember correctly.

Usually, a mech that buys from a parts store gets a discount, but then marks it up for the end user. $130 for what's normally $300 ish for a typical purchaser is a mighty good deal. Who is doing the work?

Sure, they provide a replacement if it fails within warranty, but you eat the downtime. The best warranty is the one you never have to use.