P2E74 code meaning
Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit
Powertrain system Generic code P2Exx codes Check engine light
What P2E74 means
P2E74 covers any circuit fault of coolant temperature sensor D, the fourth such sensor a maker can fit to the battery's liquid cooling. Battery controllers typically watch coolant at the pack inlet and outlet; GM's Volt and ELR tables use sensor A for the inlet and B for the outlet. Where a sensor D sits is not public. No manufacturer documents P2E74 publicly. Such sensors are sealed NTC thermistors; one supplier part for battery coolant reads 2828 ohms at 25 °C. GM's 2011 Volt runs its coolant sensor range checks only while no fault is active on the battery controller's 5 V reference circuit. CARB requires the inputs of battery heating and cooling to be monitored. Without the value, cooling may run on substitute data and power can be limited.
P2E74 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2E74
- Hybrid system or check engine light
- Battery cooling or heating not working as intended
- Reduced electric power or charging rate
Common causes of P2E74
- Most likelyDamaged wire, loose connector or corroded terminal at sensor D
- PossibleFault on the shared 5 V reference circuit of the battery controller
- PossibleCoolant temperature sensor D failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack coolant temp sensor dWiring harnessBms
What each part of P2E74 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 74 | The exact fault in that area. |
What to do next
- Note P2E74 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 P2E74
What does P2E74 mean?
P2E74 means "Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit". P2E74 covers any circuit fault of coolant temperature sensor D, the fourth such sensor a maker can fit to the battery's liquid cooling. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E74?
Drive gently and only to a workshop. With P2E74 the car can go into limp mode (reduced power) to protect itself.
Will P2E74 fail an emissions test?
Yes, it can. P2E74 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 P2E74 to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2E74 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.