P2E76Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2E76 reports that the voltage on battery coolant sensor D has dropped below its lower limit. Because these sensors are NTC thermistors whose resistance falls as they warm, a low voltage stands for very hot coolant, and a grounded signal wire or a sensor with an internal short produces exactly that picture. No manufacturer documents P2E76 publicly. GM's comparable sensor B code, P0CD7, sets at a reading of 87.9 °C or more, equal to an ADC count of 130 or less, for 1.75 s within a 2.5 s window; the 2016 ELR table marks it two-trip. Coolant genuinely that hot in a battery loop is rare, so suspect wiring first. CARB requires out-of-range detection for battery thermal inputs. The high-voltage counterpart is P2E77.
- What you may notice
- Hybrid or check engine warning
- Cooling may run at full effort or power may be cut back
- Likely causes
- LikelySignal wire of sensor D shorted to ground
- PossibleSensor D shorted internally, for example after coolant entered it
- RareActual overheating of the battery coolant loop
- 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.