How to fix P06DA code Mercedes-Benz. A Mercedes-Benz GLC 250 4Matic (X253) M274 engine came in diagnosed with P06DA Diagnostic Trouble Code - its a known problem with Mercedes. The symptoms are some sporadic moments where the whole dash lights up and even though the car would still drive fine, a lot of electric related functions get disabled. It is a fault in the engine oil pump control valve (solenoid) or due to its bad connector or harness (wire) or both. Part numbers are: ✅A 278 180 04 15 (En