Powertrain, generic · Hybrid propulsion

P0BD9 Drive Motor Inverter Temperature Sensor D Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0BD9 means inverter temperature sensor D delivers a voltage above its valid range. For GM's NTC sensor in the motor B inverter that equals an implausibly cold inverter, so an open circuit, a lost ground or a cracked thermistor is likely. GM checks only after the inverter has run at least 90 s at 20 Nm or more, so a real cold start is excluded. The 2016 Volt then sets it below -50 °C for 2.6 of 3.65 s, Type B, two trips; a 2019 table uses -50 °C with Type A; the 2011 Volt below -58 °C, Type A; the 2012 table below -40 °C, two trips. Until the value is valid the controller uses substitute values and may limit motor B. Check the inverter connectors before replacing the unit.

Likely causes

Open sensor or circuit inside the power inverter module
Loose, corroded or unplugged connector at the inverter
Lost sensor ground

Symptoms

  • Malfunction indicator lamp, depending on model after two trips
  • Reduced motor B power and regeneration
  • Implausibly low inverter temperature in live data

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time0.5–6 h

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

Parts involved

drive motor inverter temp sensor dwiring harnesshybrid control module

Related codes

P0BD8P0BD6P0BD7P0BDAP0AF5P0BD4

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