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

P2A46

Alternative Fuel Tank C Pressure Sensor Circuit

The AFCM detects a generic fault on the pressure sensor of alternative fuel tank C. Tank pressure cannot be monitored reliably.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberA / 46

Possible causes

  • Pressure sensor failed high
  • Wiring or connector fault medium

Inspection / repair

  • Difficulty: medium
  • DIY: shop recommended
  • Estimated cost: 150–800 €
  • Estimated time: 1–4 h
  • Component: alt fuel tank c pressure sensor
  • Component: wiring harness
  • Component: afcm
  • MIL / check engine light
  • emissions-relevant
  • limp mode possible

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