Powertrain, generic · Hybrid propulsion

P0CB1 Hybrid/EV Battery Temperature Sensor N Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0CB1 points to an unsteady sensor N signal rather than a lasting short or open. GM's 2019 table 19OBDG02 evaluates windows of ten samples, one every 100 ms, by integrating the absolute value of each change; above 10 the window counts as failed, and 4 failed windows within 5 set the code, Type B, two trips. It needs more than 10.2 V supply and an active data link to the battery interface control module. The 2016 table 16OBDG02 already ran this jitter test, there with U179C as a blocking code. Mitsubishi assigns no erratic code to sensor [13]. Because readings can stay inside the valid band, P0CAF and P0CB0 often remain absent. Loose pins, a damaged sensor lead or a cracked board track are likely, and the fault may come and go with temperature or vibration.

Likely causes

Loose or fretting pin in the sensor N circuit
Chafed or partly broken sensor N lead
Cracked track on the monitoring board

Symptoms

  • Intermittent warning lamp
  • Sensor N value jumping in live data

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–5 h

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

Parts involved

hv battery temp sensor nwiring harnessbms

Related codes

P0CADP0CAEP0CAFP0CB0P0CACP0CB6

References: gsi.ext.gm.com, gsi.ext.gm.com.