Code Definition

P011A — Coolant temperature sensor difference between bank 1 and 2 signals excessive

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

About P011A

P011A 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 P011A is stored, the module has detected 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 P011A 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 P011A is set when the Engine Control Module (ECM) detects a significant difference in the coolant temperature readings between sensors in Bank 1 and Bank 2. This excessive variance suggests that the temperature sensors, which are supposed to report similar coolant temperatures under normal operating conditions, are providing substantially different readings. Such discrepancies can be caused by a malfunction of one or both sensors, cooling system issues affecting one part of the engine more than the other, or problems in the sensor circuits. Accurate coolant temperature readings ...

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