Powertrain, generic · Hybrid propulsion

P0ACD Hybrid/EV Battery Temperature Sensor C Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0ACD indicates that battery temperature sensor C reports a voltage above its plausible range, which an NTC sensor translates into extreme cold. Common reasons are an open circuit, a pin backed out of the sensing board connector or a cracked thermistor. GM sets the code below -69 °C in 8 of 10 samples in its 2016 and 2019 tables, below -45 °C in 30 of 40 on the 2011 and 2013 two-mode hybrids, and above 4.63 V, about -45 °C, in 7 of 10 in the 2013 table 13OBDG05C; Type B, two trips. On the Chevrolet Volt, bulletin 18-NA-342 ties it to a false Battery Too Cold message and a reprogramming fix. A seemingly frozen pack is heavily limited in charge and discharge.

Likely causes

Open signal or return wire of sensor C
Thermistor open or cracked
Controller software issue on the Volt (bulletin 18-NA-342)

Symptoms

  • Check engine or hybrid warning light
  • Battery too cold message in mild weather
  • Strongly reduced charging and electric power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–2,500
Time0.5–5 h

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

Parts involved

hv battery temp sensor cwiring harnessbms

Related codes

P0ACCP0ACAP0ACBP0ACEP0AC8P0AEB

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.