Powertrain, generic · Hybrid propulsion

P0C98 Hybrid/EV Battery Temperature Sensor L Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0C98 is the plausibility code for sensor L: its reading is electrically valid but strays too far from the other sensors. GM's table for the 2012 Volt (12OBDG01A) runs the comparison only after more than 21,600 s with propulsion, off-board charging and thermal conditioning all off; a deviation over 25.3 °C, seen in 50 of 67 samples, counts as a Type B failure. In 19OBDG02 from 2019 the limit becomes 25.00 °C with sampling every 25 ms and the same count, and the test pauses while circuit codes for the battery sensors or a lost link to the battery controller are present. Mitsubishi does not use this code. Sensor drift or a detached sensor are the common reasons; P0C99 and P0C9A cover electrical failures.

Likely causes

Thermistor L drifted within its electrical range
Sensor L no longer in thermal contact with its cells
Genuine local temperature difference in that pack section

Symptoms

  • Warning lamp after a long standstill
  • Reduced battery power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–2,500
Time0.5–5 h

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

Parts involved

hv battery temp sensor lwiring harnessbms

Related codes

P0C97P0C99P0C9AP0C9BP0C93P0CA9

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