U0694Lost Communication With Hybrid/EV Battery Pack Coolant Pump A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Liquid-cooled traction batteries rely on an electric pump to move coolant through the pack, and pumps like Bosch's PCE accept their speed command by PWM or LIN and report faults themselves. U0694 records that battery pump A no longer communicates. Published manufacturer data do not mention it. GM's hybrid table 19OBDG01 drives its battery pump by a discrete or PWM line and judges the line current (under 200 mA or over 3 A, 4 s within 5 s, Type B), so faults surface as P0C47. Hyundai uses its own U1118 for the battery pump on the 2019 Kona Electric; campaign T4G traced it to coolant entering the pump's electronics housing and replaces the housing or the pump. Expect reduced power, slower charging and a hybrid or EV warning.
- What you may notice
- Hybrid/EV system warning
- Reduced drive power
- Slower DC fast charging
- Likely causes
- LikelyCoolant entered the pump electronics housing
- PossibleBus, supply or ground wire to the pump damaged
- PossiblePump motor or controller failed
- RareBattery or hybrid controller software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.