P0EC5A/C Compressor Motor Speed Sensor Range/Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EC5 means the speed information of the electrically driven compressor motor is implausible: the motor does not turn at the speed the controller expects, or the reported value contradicts other data. Mazda uses the code on the 2024 to 2026 CX-90 PHEV and 2025 to 2026 CX-70 PHEV, describing P0EC5:00 in the PCM as an error signal coming from the compressor. Bulletin 07-002/26b lists it beside P0D6D, U0605 and P0AA6 when an overcurrent shorts the compressor internally and the high-voltage A/C fuse blows; the A/C then stops cooling. GM's 2011 Volt ran a similar test as P1F0A, Type B: fault if the spinning motor stays below 1800 rpm for 20 seconds.
- What you may notice
- A/C does not cool
- Accompanying compressor voltage, communication or insulation codes
- Likely causes
- LikelyInternal short in the electric compressor after overcurrent (Mazda PHEV)
- PossibleBlown high-voltage A/C fuse cutting compressor power
- RareMechanical drag or lack of oil keeping the motor below target speed
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.