U0695 code meaning
Lost Communication With Hybrid/EV Battery Pack Coolant Pump B
Network system Generic code U06xx codes Check engine light
What U0695 means
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.
U0695 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0695
- Battery temperature warning or power limit
- Charging power reduced
- Hybrid/EV system warning
Common causes of U0695
- Most likelyWiring or connector of pump B damaged or wet
- PossiblePump B electronics or motor failed
- Less likelyControlling module or software faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery coolant pump bVehicle bus wiring
What each part of U0695 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 95 | The exact fault in that area. |
What to do next
- Note U0695 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0695
What does U0695 mean?
U0695 means "Lost Communication With Hybrid/EV Battery Pack Coolant Pump B". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U0695?
Drive gently and only to a workshop. With U0695 the car can go into limp mode (reduced power) to protect itself.
Will U0695 fail an emissions test?
Yes, it can. U0695 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0695 to fix?
Difficulty: hard. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will U0695 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.