P0EC9A/C Refrigerant Distribution Valve A Stuck/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- How the car detects it
- P0EC9 reports that refrigerant distribution valve A, a solenoid valve that splits refrigerant between branches of the A/C circuit, stays open or does not close on command. Such a fault is usually detected indirectly, because pressure or temperature behind the valve fails to react when it should be shut. Audi uses the code on the 2016 A3 Sportback e-tron: P0EC900 is logged passive/sporadic in the Climatronic module J255, and the MIL is switched on at the request of another module over the network, so the engine module J623 holds no code. Bulletins 2046942 and 2047037 trace it to a miscalculation in the refrigerant self-test and call for new J255 software; if the code returns after erasing, it has to be diagnosed as a real fault. Circuit faults of valve A are P2611 to P2613, valve B stuck open is P0EE2.
- What you may notice
- MIL on without a code in the engine control module
- Code stored passive/sporadic in the climate control module
- Reduced or uneven cooling in one branch, or no noticeable change at all
- Likely causes
- LikelyFaulty self-test calculation in the climate control software (Audi A3 e-tron, fixed by update)
- PossibleValve held open by dirt, debris or a sticking armature
- RareWeak solenoid coil that no longer pulls the valve fully shut
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.