P2DA7Coolant Heater A Control Module System Voltage
- Generic OBD-II code · Powertrain
- How the car detects it
- P2DA7 is logged when the electronics built into coolant heater A – the HV heater of a hybrid or EV – see a system voltage outside the window in which it may work. While P2DA5 points to the feed circuit, this code judges the level. High-voltage heaters have a defined range; DBK's 400 V unit, for example, runs from 195 to 450 V DC, and Texas Instruments notes that heater controllers must cope with a varying DC bus and may monitor their supply rails. No manufacturer documents P2DA7 publicly or states whether it rates the HV or the 12 V side. Typical reasons are a strongly discharged or very full traction battery, a weak 12 V battery or a measuring fault in the heater. The heater stays off while the voltage is out of range and usually resumes afterwards.
- What you may notice
- Electric heater temporarily without function
- Fault occurs with very low or very high battery charge
- Cabin heat only from the engine of a hybrid
- Likely causes
- PossibleTraction battery voltage at the edge of the heater's range (very low or very high charge)
- PossibleWeak 12 V battery or poor ground of the heater electronics
- PossibleVoltage measurement inside the heater faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.