P2E74Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid system or check engine light
- Battery cooling or heating not working as intended
- Reduced electric power or charging rate
- Likely causes
- 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
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.