Code Definition

P111A (28) — Engine Coolant Over Temperature Condition – Forced Limited Power

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Mazda

About P111A

P111A is a manufacturer-specific powertrain diagnostic trouble code recorded for Mazda vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P111A is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

On these Mazda vehicles the Powertrain Control Module (PCM) monitors engine coolant temperature through the Engine Coolant Temperature (ECT) sensor to keep the engine within a safe thermal range. DTC P111A with this subcode sets when the PCM determines the coolant temperature has exceeded the calibrated over temperature threshold for a set period, and in response it commands a protective forced limited power mode to reduce engine load and prevent thermal damage. The code can reflect a genuine overheating condition where the cooling system cannot hold temperature, or a false reading from the EC...

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