Powertrain, generic · Hybrid propulsion

P0BD4 Drive Motor Inverter Temperature Sensor C Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0BD4 reports a voltage from inverter temperature sensor C above its valid range. For GM's NTC sensor this is an implausibly cold inverter, typically caused by an open circuit, a lost ground or a cracked element. To avoid false alarms on a cold day GM waits until the inverter has run at least 90 s at 20 Nm or more. The 2016 Volt and a 2018 table then set 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 and 2016 ELR use below -58 °C, Type A; the 2012 and 2013 tables below -40 °C, two trips. Until the reading is valid the controller protects the inverter with substitute values and may cut motor power.

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 electric drive power
  • 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 cwiring harnesshybrid control module

Related codes

P0BD3P0BD1P0BD2P0BD5P0AF0P0BD9

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