Powertrain, generic (extended)

P2E76 Hybrid/EV Battery Pack Coolant Temperature Sensor D Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Signal wire of sensor D shorted to ground
Sensor D shorted internally, for example after coolant entered it
Actual overheating of the battery coolant loop

Symptoms

  • Hybrid or check engine warning
  • Cooling may run at full effort or power may be cut back

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–700
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hv battery pack coolant temp sensor dwiring harnessbms

Related codes

P2E74P2E77P2D54P0CD7P0C44

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org, amphenol-sensors.com.