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

P06AB

Control Module Internal Temperature Sensor B Circuit

A general circuit fault on the ECU's internal temperature sensor B - the sensor that monitors module operating temperature for thermal protection.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / AB

Possible causes

  • Internal sensor fault high

Symptoms

  • Check engine light on
  • Possible limp mode or no-start
  • Multiple follow-up faults across modules
  • Reset/relearn may be needed after repair

Inspection / repair

  • Difficulty: hard
  • DIY: shop recommended
  • Estimated cost: 400–2000 €
  • Estimated time: 2–6 h
  • Component: ecu internal temperature sensor b
  • MIL / check engine light

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