Code Definition

P011B — Coolant temperature and intake air temperature sensor signal mismatch

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

About P011B

P011B 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 P011B is stored, the module has detected 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 P011B 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 P011B is set when the Engine Control Module (ECM) detects a mismatch between the signals from the coolant temperature sensor and the intake air temperature sensor. This discrepancy suggests that the readings from these two sensors, which should correlate to some extent under normal operating conditions, are significantly divergent. Such a mismatch can be caused by a malfunction in one or both sensors, issues in the sensor circuits, or actual differences in temperature conditions. Proper functioning of these sensors is critical for the ECM to manage engine operation effectively, ...

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