P0377 OBD II Trouble Code Timing Reference High Resolution Signal B Too Few Pulses

How to diagnose, repair, and info on causes of a P0377 engine code which pertains to the timing refence high resolution signal, or engine position sensor signal, which the PCM has detected too few pulses. Also includes links to relevant forum topics on the code.

Symptoms of P0377 OBD II Trouble Code

  • Illuminate check engine light
  • Hard starting/no starting
  • Poor engine performance

Common Causes of P0377 OBD II Trouble Code

  • Faulty sensor
  • Wiring problems
  • Reluctor wheel damage
  • Contaminated oil
  • Faulty PCM

Severity of P0377 OBD II Trouble Code

The severity of these codes is moderate to severe. Symptoms of a P0377 engine code may include: