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

P25D7

Fuel Level Sensor C Circuit

A third fuel level sensor (C) used on multi-tank trucks, dual-saddle SUVs, or auxiliary fuel systems returns no usable signal. Without it, calculated fuel level and EVAP monitor enabling will be off.

SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / D7

Possible causes

  • Open sender resistor or broken float high
  • Corroded tank pump module connector medium

Inspection / repair

  • Difficulty: hard
  • DIY: possible
  • Estimated cost: 150–700 €
  • Estimated time: 1.5–4 h
  • Component: fuel level sensor c
  • Component: fuel tank
  • Component: wiring harness
  • 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