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

P028A

Charge Air Cooler Cooling Fan Control Circuit/Open

Open circuit at the charge air cooler cooling fan (electric fan helping to cool the intercooler).

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number2 / 8A

Possible causes

  • Wiring break high
  • Pin pushed back out of connector body low
  • Cracked solder joint inside the module or sensor low

Inspection / repair

  • Difficulty: medium
  • DIY: possible
  • Estimated cost: 100–800 €
  • Estimated time: 0.5–4 h
  • Component: cac cooling fan
  • Component: fan wiring
  • MIL / check engine light
  • emissions-relevant

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