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P0642 code comes up when coasting
Posted: Sun Mar 30, 2014 4:43 pm
by krissondors
Hi everyone, new to the place. I recently bought a 95 ssei and I love it. Needs some tlc but its nice. So I have my ses light come on and the car drives great BUT I am only getting about 2# of boost. I bought it off my friend and before the light came on it was hitting around 7#. Anyway, the code is p0642 which is quad module 1. Im 90% sure its the tcc circuit because the code only comes on when coasting. I replaced all four solenoids and still no luck. I have alldata and on demand and I did all the tests I could without the tech 2. Any ideas what I can be? Thanks!
Re: P0642 code comes up when coasting
Posted: Sun Mar 30, 2014 6:47 pm
by J Wikoff
Is that similar behavior to a bad egr?
Re: P0642 code comes up when coasting
Posted: Sun Mar 30, 2014 6:54 pm
by krissondors
J Wikoff wrote:Is that similar behavior to a bad egr?
As far as I understand, EGR has nothing to do with it
Re: P0642 code comes up when coasting
Posted: Mon Apr 07, 2014 6:16 pm
by PopaTim
try another PCM. 94 & 95 are notorious for pcm's going bad.
Re: P0642 code comes up when coasting
Posted: Mon Apr 07, 2014 6:54 pm
by krissondors
PopaTim wrote:try another PCM. 94 & 95 are notorious for pcm's going bad.
That's what my suspension is. If I had one handy I'd do it but seems like a expensive test. Im going to purchase a tech 2 at some point so if I dont find the problem by the problem by then hopefully ill figure it out