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

P0377

Timing Reference High Resolution Signal B Too Few Pulses

Timing reference signal B delivers fewer pulses per crank revolution than expected — broken reluctor teeth, sensor air gap too wide, or tone wheel chipped.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / 77

Possible causes

  • Tone wheel teeth broken or sensor gap excessive high

Inspection / repair

  • Difficulty: hard
  • DIY: shop recommended
  • Estimated cost: 200–1500 €
  • Estimated time: 1–4 h
  • Component: camshaft position sensor
  • 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