Guys I need your help. I have a '18 C63S, Dinan tuned. 2 weeks ago I was getting gas at Exxon which took wayyyyyy longer than the normal 1-3 minutes. It literally look like 10 minutes, the counter was moving really slow, I didn't think much of it, just let it do its thing, then it OVERFILLS, gas everywhere. Went to drive to SF, noticed a CEL on, then noticed NO BOOST. Drove back to LA, had to get gas again at 76, few minutes later, CEL goes off, and boost is back (yay). Yesterday, CEL comes back on, no boost again. Took it to the stealership this morning, of course, they see the wiring harness to the piggyback ECU and blame it on that.

They told me the 2 codes they got were P024212 (Component B28/22 (left pressure sensor downstream of throttle valve) malfunction, there is a short circuit to positive; and P2A0D12 (intake manifold pressure sensor 2 has a short circuit to positive). I've had the tune for almost 2 years now, I'm fairly certain it's not caused by the tune. My question is, does anyone know what those codes mean (or what can cause this), how I go about repairing it? And can overfilling the tank throw those codes? The dealership won't reset my CEL, so I'm waiting for my OBD2 scanner to be delivered to reset it myself. Thanks!

 

Just because you've had the piggyback for 2 years doesn't mean it hasn't failed. I don't think overfilling the tank would cause those codes. If any codes would be set because of the overfilling, then it would probably be evap related. But you should bypass the piggyback and see what you get from there.

 

Thanks I've tried to plug in the bypass (stock) tune to the Dinan harness but still getting CEL, will double check the harness connections this weekend.

 

You cleared the code?

 

Waiting for scanner to clear code tomo =/

 

If you didn't clear it, it won't go away on its own. You might have to do a certain number of restarts before it goes away on its own, if the fault is fixed.