Powertrain, generic · Hybrid propulsion

P0C35 Hybrid/EV Battery Temperature Sensor F Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Sensor F is an NTC thermistor with a pull-up on the sensing board, so its voltage drops as temperature rises; a short to ground looks like an extremely hot cell group. Low refers to the signal, not to the temperature. GM's 2016 table sets P0C35 when the converted value exceeds 160 °C in 8 of 10 samples; the Volt battery tables of 2016 to 2019 use above 87.5 °C for 1.4 s within 2 s; the eAssist mild hybrid flags a sense voltage under 0.3 V, about 90 °C, in 7 of 10 samples. All are Type B, two trips. Volt bulletin 18-NA-342 calls it sensor 6 circuit low voltage. The opposite fault is P0C36; a pack that is really too hot is reported as P0A7E. Because the controller must assume heat, it cuts power and may run the cooling hard.

Likely causes

Sensor F signal wire chafed and shorted to ground
Internally shorted thermistor F
Faulty input on the battery sensing board

Symptoms

  • MIL after two trips
  • Battery cooling running at high speed
  • Strongly reduced charge and drive power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,500
Time1–5 h

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

Parts involved

hv battery temp sensor fwiring harnessbms

Related codes

P0C36P0C34P0C33P0A7EP0BC4

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