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Old 08-07-2012, 04:27 PM   #1
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So my 9-3 keeps going limp. I replaced both solenoid valves(part number 12787706) on each end of the loop and it's still tripping into limp mode after a few minutes of driving after resetting T8. Am I looking at the more costly replacement of the Bypass Valve now? All the vacuum lines look good and electrical connections seem intact?
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Old 08-10-2012, 06:04 AM   #2
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More info will go a long way. What does the car do before it goes into limp? Noises, vibrations, boost spike? I just had a recurring problem with mine going into limp every time id go full boost. You couod hear the bypass valve shuttering and the wastegate hooting on and off right before. It always threw a solenoid code.....but i ended up having to replace my entire fuse block :-/ $$$
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Old 08-10-2012, 06:09 PM   #3
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New mechanic looked at it today. Smoke tested CBV and as I've already replaced both solenoids on vacuum loop, he checked the electrical plugs and connections on solenoids and found them OK. He found tech bulletin on P0033code to check wiring harness, so he manipulated the harness, reset T8, and it's back to full boost. He's unsure if that did the trick and I'll have to see how long it keeps boost. If it trips again, he said it could be a tricky process finding out exactly where fault lies.
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Old 08-11-2012, 05:04 AM   #4
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Re-tripped

Lost boost again. Frustrated. No unusual noises, car is running fine. Valves, actuator, solenoids, and vacuum all check OK. How do I put T8 to sleep???
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Old 08-12-2012, 08:24 AM   #5
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Check this out, some useful info and seems to lean towards the bypass valve itself being at fault if you've replaced both solenoids.

P0033 Turbo charger bypass valve control circuit - SaabCentral Forums
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Old 08-12-2012, 12:48 PM   #6
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Yeah, I studied that thread before and my mechanic did a smoke test on the CBV to try and detect any diaphragm tears, which he did not find. He mentioned the tech bulletin on the P0033 code first references checking the wiring harness, which is like trying to find a needle in a haystack. I've noted that with all the posts on this site and others regarding this issue, there are seems to be only solenoid and BCV diaphragm causes. No one has mentioned wiring, and that's number one item in Saab tech bulletin. Probably a dumb question, but is there no way of bypassing this check/fault in OBD computer?
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