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Old 10-21-2007, 03:03 PM   #1
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Fault code P1230 and P1231

On my way to SCD today the Check Engine and Traction Controll Off lights decided to come on in my Viggen. The car runs fine but with an obvious lack of boost, and I've noticed the engine is idling rather high, between 1500 and 2000 RPMs.

Thanks to some great people at SCD we checked and cleared the codes with a Tech II; the codes came up as P1230 and P1231. Anyway, when I left to drive home the car seemed to be running okay, though power delivery wasn't so smooth and the throttle almost felt like the cable was sticking. The CEL came back rather quickly and I'm back to no boost and a high idle (the sticky throttle sensation is gone though).

A quick search links the P1230 code to a throttle positon sensor error, which seems like the only way to fix is to replace the throttle body. I can't come up with anything specifically on P1231, although atleast one of the posts I read mentioned both codes as well.

So before I rush out and buy a new throttle body, what do you guys think? Is there anything else I could or should try? I'd love to avoid dropping the car off at the dealer.
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Old 10-21-2007, 03:09 PM   #2
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Yup pretty much only choice is to replace the throttle however it is possible the software may need an update because of 1230 as that is what WIS notes. Take it into a dealer or an indy and let them take a look at it to figure it out.

1231 relates to potentiometer sensor 1 reading incorrectly and causes idle and surging problems. It happens because the throttle plate begins making brief closing motions.

1230 is also being caused by 1231 because the sum that the ECU expects from sensor pot 1 and sensor pot 2 do not match.
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Old 10-21-2007, 03:10 PM   #3
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shit that happened to my dads 9-3 they wanted like 1500 to fix it.
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Old 10-21-2007, 03:17 PM   #4
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Christ on a pony, $1500?!

Searching around I saw it mentioned that a throttle body was going for something like $280, I wonder what the rest of the blood money was for.

What did your dad end up doing to fix it?
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Old 10-21-2007, 03:20 PM   #5
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Yup pretty much only choice is to replace the throttle however it is possible the software may need an update because of 1230 as that is what WIS notes. Take it into a dealer or an indy and let them take a look at it to figure it out.

1231 relates to potentiometer sensor 1 reading incorrectly and causes idle and surging problems. It happens because the throttle plate begins making brief closing motions.

1230 is also being caused by 1231 because the sum that the ECU expects from sensor pot 1 and sensor pot 2 do not match.
Awesome. Atleast I know it's not fatal. Maybe to my wallet it is, but the car will live another day.
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Old 10-21-2007, 03:23 PM   #6
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Well that just depends on whether its a software issue or not. If its not software then you need a new throttle body no matter what. I love having wis to read through the explination of the codes and what triggers them.
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Old 10-21-2007, 03:38 PM   #7
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I guess this is what I don't get. AFIK it's never been replaced, so why would it suddenly need new software to continue to work? Granted I like the idea of paying a dealer to update the software vs. buying a new throttle body but I'm not holding my breath.
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Old 10-21-2007, 03:41 PM   #8
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Well here is the thing. Software updates can be done for a multitude of reasons. 1.) A new version provides better diagnostic resources, 2.) Update to cover a problem occuring on a large scale that you may or may not have experienced.

Also if you buy a new throttle and put it in yourself you still need to make a trip to a dealer or indy to have it calibrated.
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Old 10-21-2007, 03:45 PM   #9
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So a software update to make it less tolerant of other conditions...

I wasnt aware it needed calibration after a new one was installed. Oh well, my local dealer was always pretty cool with me when I brought in my '04 Sport Sedan, I might as well give them a call in the morning so I can drop it off and have them give it a look.

Thanks for the advise!
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Old 10-21-2007, 03:48 PM   #10
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So a software update to make it less tolerant of other conditions...

I wasnt aware it needed calibration after a new one was installed. Oh well, my local dealer was always pretty cool with me when I brought in my '04 Sport Sedan, I might as well give them a call in the morning so I can drop it off and have them give it a look.

Thanks for the advise!
Not a problem and your welcome. The calibration gives the ECU its basis to know what values to measure with the throttle body. For example lets say your current throttle body when 0% throttle is given reads 0volts but this new throttle might read .1 volts due to some resistance in the sensor itself.....if you didn't recalibrate everything would be off and you'd be right back to square one.
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Old 10-21-2007, 05:15 PM   #11
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Originally Posted by andrew View Post
Christ on a pony, $1500?!

Searching around I saw it mentioned that a throttle body was going for something like $280, I wonder what the rest of the blood money was for.

What did your dad end up doing to fix it?
sold the car
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Old 10-25-2007, 07:43 AM   #12
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Well, the dealer did indeed condemn my throttle body. not a cheap part to replace! List price on the part was $461, add on the labor and tax and that was an expensive day.
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Old 10-25-2007, 07:48 AM   #13
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But it's all fixed?
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