P0377 code meaning, causes and symptoms
P0377 means timing reference high resolution signal b too few pulses.
P0377 code meaning is one of the most common OBD-II searches when a warning light appears on the dashboard.
Drivers searching for P0377 usually want to know what the code means, whether the car is safe to drive and what part may need testing first.
Because P0377 can appear on multiple makes and models, it is important to combine the code meaning with live data, symptoms and any other stored faults.
A proper diagnosis for P0377 should normally include a scan tool check, freeze-frame review and inspection of the components related to timing reference high resolution signal b too few pulses.
Severity: High
Driving advice: Driving may be risky if the engine is running poorly, stalling or showing strong timing-related symptoms.
FAQs
What does P0377 mean?
P0377 means timing reference high resolution signal b too few pulses.
What can cause P0377?
Causes can include failed components, wiring faults, leaks, pressure issues, bad readings or another upstream fault affecting the same system.
Is P0377 serious?
Severity depends on how the vehicle is behaving and what system is affected. Some codes are minor, while others can affect engine performance, emissions or drivability.