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Old 05-19-2017, 08:20 PM   #1
alblades
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Default Throttle body high voltage

HELP!!! Car Goin into limp mode. When this happens the throttle body is having huge voltage spikes reading 20 volts. What could cause the throttle body too see such high voltage? Also when it goes into limp mode u can hear what sounds like a reley clicking under the passenger side dash. 2006 wrx
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Old 05-19-2017, 09:42 PM   #2
DrD
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is the check engine light on? have you checked for codes, either current or pending?
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Old 05-20-2017, 12:49 AM   #3
alblades
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Yeah my ap was pulling the p0607 code which I've been having for the past year on and off. The dealer said it was bad ecu so they replaced it but 3 months later car went to limp mode again with same code.. I let car sit for a few weeks them it ran fine during fall and all winter with no issues at all.. now I'm having same issue again now that it's warm out. It seems too be heat related. I have car in shop now and there getting a different code for throttle body and not the p0607 that I was getting on my ap
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Old 05-20-2017, 08:22 AM   #4
Charlie-III
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How are you measuring the voltage spikes? If you have them, maybe fixing that will resolve the CEL issue. Could be loose connections in the charging circuit or failing regulator for the alternator.
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Old 05-20-2017, 08:33 AM   #5
alblades
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Was measuring and checking all the live data through a snap on scanner we were going through all the data trying too see if there was anything outta normal and seen the throttle body voltage was spiking and all over the place
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Old 05-20-2017, 08:50 AM   #6
alblades
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There was a code for the throttle body but I can't think of it at the moment. But I never had that code with my ap. All I could pull was p0607. With the snap on scanner we never got the p0607 only the throttle body code
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Old 05-20-2017, 08:26 PM   #7
Xcal55
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By any chance was the other code that popped up was P2135 or P0223?? I am also having the exact same issue with my 2011 STI
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Old 05-21-2017, 12:32 AM   #8
alblades
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It may have been p2135 but I'm not certain. I'm replacing the throttle body this week with a used one I'm getting for cheap I'll keep u updated with what happens
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Old 05-21-2017, 10:04 AM   #9
Charlie-III
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Quote:
Originally Posted by alblades View Post
It may have been p2135 but I'm not certain. I'm replacing the throttle body this week with a used one I'm getting for cheap I'll keep u updated with what happens
If you're going to replace something, why not just the TPS? Should be a lot faster, cheaper and easier.

Also, have you done any checking into why the 20VDC? It's a 12VDC system, higher than that voltage would be more related to the charging circuit. The high voltage would likely skew sensor readings which is pissing off the ECU.
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Old 05-21-2017, 10:08 AM   #10
alblades
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I'm getting the whole unit for 50 bucks so might as well swap it all. And as for everything else nothing seems to be getting over voltage like the throttle is. We've checked for shorts and not finding anything as of now.

Last edited by alblades; 05-21-2017 at 10:40 AM.
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Old 05-21-2017, 01:19 PM   #11
tramp
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Never throw money at electrical problems. The only thing cured by that approach is an overweight wallet.

Diagnose then repair. Of course it's easier said than done but it's the correct method.
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Old 05-21-2017, 10:54 PM   #12
alblades
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Yeah Ik ur not supposed too do that but figure for 50 bucks it's worth a shot. I've been told that with these throttle body's if there Goin out it can cause these types of issues as well
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Old 05-21-2017, 11:58 PM   #13
DrD
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how would a bad throttle body give you a 20V spike?
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Old 05-22-2017, 12:27 AM   #14
Charlie-III
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Quote:
Originally Posted by DrD View Post
how would a bad throttle body give you a 20V spike?
My point exactly........

"I have a slow leak in my tire, let's put on a used exhaust....".
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