OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P0A30

Drive Motor B Temperature Sensor Circuit

The ECM detects a circuit fault on the drive motor b temperature sensor. Reading cannot be used reliably for control.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / numberA / 30

Possible causes

  • Sensor failed high
  • Wiring or connector fault medium

Symptoms

  • EV/hybrid system warning light on
  • Reduced motor power or torque
  • Possible limp mode or vehicle shutdown

Inspection / repair

  • Difficulty: easy
  • DIY: possible

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Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication