P2E45 code meaning
Hybrid/EV Electronics Coolant Pump B Enable Circuit
Powertrain system Generic code P2Exx codes Check engine light
What P2E45 means
Some designs switch electronics coolant pump B on through a separate enable line or a relay, independent of the speed command; P2E45 reports a fault in that path. GM's 2018 hybrid tables show the scheme for pump A: with the enable output active, more than 0.6 A on the line counts as a short to ground (P1F44); with it inactive, more than 35 µA or a line voltage under 4.5 V counts as a short to voltage (P1F45), each after 16 of 20 samples at 250 ms, Type B. The 2016 tables list the same pair. Mitsubishi's 2022 Outlander PHEV powers its electric water pump through a relay energised by the PHEV-ECU and names that relay among the causes of its pump speed code P10D9. No manufacturer documents P2E45 itself. Without enable the pump stays dead although the command signal is fine. Pump A's code is P0CED.
P2E45 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E45
- Pump B never starts although commanded
- MIL and hybrid or charging warning
- Power or charging limited as electronics heat up
Common causes of P2E45
- Most likelyEnable wire open or shorted between module and pump
- PossiblePump relay or its fuse failed, where the design uses one
- Less likelyFaulty enable output in the controlling module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hybrid electronics coolant pump bPower electronics coolant loop
What each part of P2E45 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 45 | The exact fault in that area. |
What to do next
- Note P2E45 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 P2E45
What does P2E45 mean?
P2E45 means "Hybrid/EV Electronics Coolant Pump B Enable Circuit". Some designs switch electronics coolant pump B on through a separate enable line or a relay, independent of the speed command; P2E45 reports a fault in that path. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E45?
Drive gently and only to a workshop. With P2E45 the car can go into limp mode (reduced power) to protect itself.
Will P2E45 fail an emissions test?
Yes, it can. P2E45 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 P2E45 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2E45 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.