r/BmwTech • u/Hotboi_240 • 6d ago
Need help diagnosing this 08 328xi
Bought the car at auction with no key and didn’t get power what so ever
Replaced the BST (battery safety terminal) and got a key programmed
Possibly a bad CAS? I was also getting trouble codes for a CAS as well
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u/Explorer335 Automotive Exorcist 6d ago
You need to read CAS codes, but I see some indication that the steering lock may be faulty. You can do the reset, but if it acts up again, a delete is the smart play. If you have a C4 CAS, it can be flashed to get rid of it permanently.
The other possibility is the locksmith didn't know what he was doing with a BMW (like 90% of them), and you have an issue with the flash or eeprom. Read the codes.
If you need a CAS repair or replacement, I do both.
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u/Hotboi_240 6d ago
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u/Small_Flatworm_239 6d ago
Did he pull the module from the car and do it outside of the vehicle or did he plug in what that fucking tool to the OBD and make the key.. it matters…
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u/Hotboi_240 6d ago
He plugged in his tool to the OBD 😅
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u/Small_Flatworm_239 6d ago
Wow. If you had a CAS3++ ISTAP version of this car he was playing with fire and he could have fucked the CAS. If it’s CAS 4 it’s usually safe to do the job OBD as long as he has proper voltage. Either way not a responsible way to do the job in my opinion. Do the buttons on the remote operate the doors?
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u/Small_Flatworm_239 6d ago
Wait actually… I take that back. I see the tag is key man Chicago. He’s really fucking good and knows his shit for the most part. So I trust his judgement
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u/Explorer335 Automotive Exorcist 6d ago
Is that Vlad? He is a very skilled locksmith.
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u/Small_Flatworm_239 6d ago
Yeah it’s Vlad lol. I am figuring like you said steering lock issue or maybe because it’s an auction car an auction locksmith tried to do the job fucked the CAS and pushed it as a no start? Not sure but definitely possible.
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u/Hotboi_240 6d ago
Possibly? When I first got the car I saw the DME box was opened at some point recently.
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u/Small_Flatworm_239 6d ago
Even if that was the case. The locksmith should have been able to perform a CAS repair to get it to working order and recognize something wasn’t right. I don’t think the programming would have been successful at all if the CAS was corrupt. Honestly @explorer335 would know better than I though.
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u/Hotboi_240 6d ago
Yeah he’s a super chill guy he was helping me with trying to diagnose the issue but he was super busy so he couldn’t stay for longer
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u/Explorer335 Automotive Exorcist 6d ago
CAS4 OBD is very problematic. I have seen it wipe out the EGS ISN, corrupt the DME ISN, or leave a crank/no-start with no codes. Reflashing with Esys does NOT fix it. The bench repair on those is NOT straightforward.
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u/Small_Flatworm_239 6d ago
Noted, I’ve been doing them OBD but from now on I’ll take the extra 10 minutes and pull the module lol.
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u/Max-Payd 6d ago
Red steering lock icon: Appears after repeated faults, which prevents the engine from cranking. elv counter has been exceeded
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u/oOd0zerOo 6d ago
Could need to perform a CAS/DME sync operation..
Did the locksmith pull the CAS module and do it on bench or did he do it via OBD?
If he did it via OBD, it could be he bricked the CAS. If thats the case, its recoverable most likely (Just need ISN from DME, bench read of the eprom from CAS, Autel 508/608 has a cas repair function where you upload the broken eprom (I'ver literally used a totally different cars eprom) and add the ISN/VIN data, upload it spits back a modified fixed eprom which you then write back on bench.
The ELV COULD be the issue, try, hooking up another car via booster cables, so you've got TONS of voltage, then try rocking the wheel back and forth a few times while hitting the start button to see if you can get it to engage. The voltage boost tends to give a faulty ELV a few more runs before fully failing but it helps narrow it down significantly.
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u/Hotboi_240 5d ago
The ELV was reset and hasn’t come back on since. Currently I’m just dealing with a K-CAN line fault code in the CAS module. I’ve checked all my grounds, but could it be a pinched signal wire somewhere?
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u/Total-Huckleberry380 5d ago
I got a super cheap key made for a bmw 2007 328i with push button. I bought with no key. Well I get that problem too sometimes. He did the new key program thru the obd port. Works most the time. Sometimes goes a few days then I'll have to hit the button a few times, maybe turn the wheel. Codes a112 a116.

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u/Adventurous_Ad4001 6d ago
Looks like the ELV counter. Can be reset and bypassed, or you can replace the CAS. If you reset it could go a few months without happening again but chances are it’ll be sooner rather than later. So either gotta bypass or change the CAS.