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

P2B59

Engine Coolant Flow Control Valve Control Circuit/Open

The engine coolant flow control valve reports a control circuit/open condition. Coolant routing between engine and radiator branches cannot be commanded as expected.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberB / 59

Possible causes

  • Open in valve control wire high
  • Open valve motor medium
  • Pin pushed back out of connector body low

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 150–700 €
  • Estimated time: 1–4 h
  • Component: engine coolant flow control valve
  • Component: wiring harness
  • Component: ecm
  • 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