P0E45 code meaning
Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance
Powertrain system Generic code P0Exx codes Check engine light
What P0E45 means
P0E45 says pack voltage measurement E delivers a value that is electrically valid but does not fit the rest of the battery data. Such a rationality test usually compares the channel with the summed block or cell voltages, or with a second pack measurement. No manufacturer documents P0E45 publicly. GM's 2013 two-mode hybrid trucks (Tahoe, Yukon, Escalade, Silverado, Sierra) show the method on channel A: their battery pack control module fails P0ABB once the gap between pack voltage and the added-up block voltages exceeds 50 V in 70 of 80 checks taken every 100 ms, Type A, one trip. CARB requires plausibility monitoring for battery voltage sensors. Circuit, low, high and erratic faults of channel E are P0E44, P0E46, P0E47 and P0E48. Battery power is usually limited.
P0E45 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 P0E45
- Warning light with reduced hybrid or electric power
- Displayed state of charge or range jumps unexpectedly
Common causes of P0E45
- Most likelyCorroded or loose sense connection adding resistance and skewing the reading
- PossibleDrifting measuring stage or outdated software in the battery controller
- Less likelyFault in the reference value, e.g. a block or cell voltage channel
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 eWiring harnessBms
What each part of P0E45 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 45 | The exact fault in that area. |
What to do next
- Note P0E45 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 P0E45
What does P0E45 mean?
P0E45 means "Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance". P0E45 says pack voltage measurement E delivers a value that is electrically valid but does not fit the rest of the battery data. It is a generic code, so it means the same on every make.
Is it safe to drive with P0E45?
Drive gently and only to a workshop. With P0E45 the car can go into limp mode (reduced power) to protect itself.
Will P0E45 fail an emissions test?
Yes, it can. P0E45 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 P0E45 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0E45 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.