P2DA5Coolant Heater A Supply Voltage Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P2DA5 concerns the feed that powers coolant heater A, the electric coolant heater with its own electronics found in hybrids and EVs. The heater's controller finds its supply input missing or outside the expected window and reports it as a circuit fault, unlike P2DA7, which rates the voltage level of the module. Which feed is meant is up to the maker. Texas Instruments shows that such heater modules run their logic from the 12 V rail and can watch that rail for leaving its operating range, while the heating elements draw from the HV battery. No manufacturer documents P2DA5 publicly. Typical findings are a blown fuse, a corroded pin in the low-voltage connector, a poor ground or an open HV fuse in the distribution box. The heater stays off until the feed is restored.
- What you may notice
- No heat from the electric coolant heater
- Cabin heat only when the engine of a hybrid runs
- Possibly lost communication with the heater stored at the same time
- Likely causes
- Likely12 V or HV fuse for the heater open
- PossibleCorroded or loose pin in the heater supply connector
- PossiblePoor ground connection of the heater electronics
- RareSupply input inside the heater electronics faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.