P0E49 code meaning
Hybrid/EV Battery Pack Voltage Sense F Circuit
Powertrain system Generic code P0Exx codes Check engine light
What P0E49 means
Channel F is the sixth and last pack voltage measurement in this series and comes after channel E (P0E44 to P0E48). P0E49 is its general circuit fault: the battery controller cannot use the input, for instance because the sense line is open, the measuring chip reports an internal error or the raw value is missing, while no clear low, high or erratic pattern applies. No manufacturer documents P0E49 publicly. Systems that compare several high-voltage measurements, as GM's 2019 hybrids do between the pack sensor and the inverter and charger bus voltages, depend on every channel being valid. CARB requires all battery voltage sensors of the storage system to be monitored. The vehicle typically limits or refuses high-voltage operation.
P0E49 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0E49
- High-voltage warning and reduced power
- Vehicle may refuse to become ready
Common causes of P0E49
- Most likelyOpen sense lead or disconnected connector of channel F
- PossibleInternal fault of the voltage measuring chip or battery controller
- Less likelyMoisture or corrosion in the pack-side connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack voltage sense fWiring harnessBms
What each part of P0E49 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 49 | The exact fault in that area. |
What to do next
- Note P0E49 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 P0E49
What does P0E49 mean?
P0E49 means "Hybrid/EV Battery Pack Voltage Sense F Circuit". Channel F is the sixth and last pack voltage measurement in this series and comes after channel E (P0E44 to P0E48). It is a generic code, so it means the same on every make.
Is it safe to drive with P0E49?
Drive gently and only to a workshop. With P0E49 the car can go into limp mode (reduced power) to protect itself.
Will P0E49 fail an emissions test?
Yes, it can. P0E49 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 P0E49 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0E49 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.