U0695Lost Communication With Hybrid/EV Battery Pack Coolant Pump B
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Pump B is a second pump in the battery thermal circuit; what it serves, for instance a parallel branch or a heater or chiller loop, is up to the manufacturer. U0695 is set when that pump stops answering on its data link. No manufacturer documents this code publicly. The public GM tables show a single battery pump only: the 2016 Volt table 16OBDG01 checks its PWM control line at commands between 5 and 95 %, 40 bad readings within 50, sampled every 100 ms, Type B. Hyundai's campaign T4G shows how such pumps fail on the network, using maker-specific codes for the battery and the motor electronics pumps. Pumps like Bosch's PAD2 take PWM or LIN commands and offer diagnostics. Wired faults of pump B are P0E1A to P0E1E.
- What you may notice
- Battery temperature warning or power limit
- Charging power reduced
- Hybrid/EV system warning
- Likely causes
- LikelyWiring or connector of pump B damaged or wet
- PossiblePump B electronics or motor failed
- RareControlling module or software faulty
- 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.