P0C73Motor Electronics Coolant Pump A Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0C73 reports that coolant pump A of the motor electronics, the loop that cools the inverter and often the drive motor, does not run the way the controller commands. Kia's bulletins for Niro and Carnival hybrids use exactly this name. The 2018 Outlander PHEV sets it when, with at least 30 % pump command for over 2 s, pump speed stays between 100 and 1,000 rpm or exceeds 5,300 rpm for 0.5 s; Mitsubishi lists air in the loop, wrong coolant level or mix and frozen coolant first. Toyota tied P0C73 on the 2014-2016 Highlander Hybrid to water corroding the inverter pump connector, Kia to water entering the pump can, Mercedes (M264) to trapped air. Battery pack pump faults use P0C47-P0C4D. Power is reduced to protect the inverter.
- What you may notice
- Malfunction indicator lamp or hybrid warning lamp
- Coolant warning in the instrument cluster
- Reduced electric drive power at high load
- Likely causes
- LikelyAir trapped in the inverter cooling loop, often after coolant service
- PossibleWater ingress and corrosion at the pump connector or inside the pump housing
- PossibleLow coolant level, wrong mixture or frozen coolant
- PossibleElectric pump worn or seized
- RareControl-unit software with faulty judgement logic
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.