Date registered: May 2019
Vehicle: 2000 ML320
Location: Spokane, WA
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BAS/ESP electrical gremlins
My friend got a cheap ML320 with a burned exhaust valve, but at the time it had no electric/electronic problems. We swapped the engine with a lower mileage junkyard pull, and have had all kinds of electrical problems since. The car won't start in park, but will in neutral (mechanic traced it back and said the ECM thinks the car is in R when it's actually in P). It starts in N, so I'm not going to sweat this one for now. However, once we figured out it would start in N, now there are other faults. I picked up an iCarsoft MBII to read/reset DTCs, and here's the deal.
The BAS/ESP light is on, and the codes I get from the ESP are C1200 (Brake light switch S9/1) and P120008 (unknown.) I clear the codes, and the instant I press the brake pedal, the codes come back. Also, the brake lights do not come on. I replaced the BLS, no change. I tried disconnecting the rear lights, no change. I did not disconnect the third brake light, if there is one.
From the BAS computer, the code is C1025 (CAN signals.) When I clear that it comes back quickly.
There is probably more relevant information, but it's late and I'm pretty tired.
Thanks for any help you can provide in tracking this down.