“B58944” is the Bosch marking; “D43256BGU‑70Y” (or “μPD43256BGU‑70L”) is the manufacturer’s internal part number. They are functionally identical [8†L16-L17][20†L3].
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Pinched or shorted data lines (I/O0–I/O7) can lock up the ECU's internal bus, preventing communication via K-Line or CAN bus. Root Causes of Damage
Standard OBD-II scanners may display codes like P0606 (ECU/PCM Processor Fault) or Bosch-specific memory parity errors.