P111A: owner reports and bulletins

Powertrain (manufacturer-specific). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P111A on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

5 complaints filed with NHTSA mention P111A, 5 of them since 2015, across 2 different models. The component owners most often filed it under: engine.

Most-reported models

VehicleComplaintsModel years reported
MAZDA CX-932018, 2019

Manufacturer service bulletins that name P111A

2 technical service bulletins and manufacturer communications filed with NHTSA mention P111A, from 1 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • MAZDA CX-5 (2019, 2020), bulletin 10174569: Some vehicles may exhibit engine overheating and poor A/C performance with DTC P111A:00 stored in memory. DTC P111A:00 - Engine coolant temperature is high. NOTE: If the concern occurred during high speed driving, this S…
  • MAZDA MAZDA3 (2014, 2015), bulletin 10101461: SOME VEHICLES MAY EXHIBIT ONE OR MORE OF THE FOLLOWING CONCERNS: THE HIGH ENGINE COOLANT TEMPERATURE WARNING LIGHT ON WITH DTC P111A:00 (ENGINE COOLANT TEMPERATURE IS HIGH) IN EXTREMELY COLD TEMPERATURES. POOR HEATER PER…

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.