Code Definition

P064D — ECM oxygen sensor processor performance error - Bank 1

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P064D

P064D is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P064D is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P064D is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P064D is set when the Engine Control Module (ECM) detects a performance issue with the processor that manages the oxygen sensor in Bank 1 of the engine. This diagnostic trouble code indicates a malfunction or inefficiency in the ECM's ability to process signals from the oxygen sensor on Bank 1, which is critical for managing the fuel-air ratio and emissions control. The problem could stem from the ECM's internal processor, issues with the oxygen sensor itself, or wiring and connection problems in the oxygen sensor circuit.

Quick Facts