Models equipped with or Integral Active Steering have a small auxiliary battery (often 24V) that powers these systems. If this secondary battery fails or is not being charged by the PCU, it will trigger a host of codes, including D52C44. One owner with a BMW 650i found that the "Steering warning came on" because the EPS (Electric Power Steering) auxiliary battery was dead and not being recharged by the vehicle, causing the 24V system to be unavailable. In that case, repeatedly replacing the battery did not solve the issue because the car's Power Control Unit (PCU) was not charging it, indicating a deeper electrical system fault.
Because this is a communication error, the root cause is frequently electrical rather than mechanical: bmw error-d52c44
In many reported cases, the root cause has been traced back to the . As a BMW owner might suspect, the alternator is a high-wear component. The "alternator" is technically a generator, and this fault code directly points to a communication issue regarding energy generation . A failing alternator voltage regulator can cause the signal from the DME to become erratic or invalid. Many owners reported this code appearing alongside a "Generator Communication" fault (210901), strengthening the argument for an alternator problem. Models equipped with or Integral Active Steering have
A yellow or red steering wheel icon illuminates alongside the message "Steering response: Drive moderately." In that case, repeatedly replacing the battery did
The error can occur if the steering rack's end stops haven't been "learned" by the computer after a battery disconnect or software update. Common Symptoms
