P0376 Timing Reference High Resolution Signal B Too Many Pulses

P0376 points to too many pulses in Timing Reference High Resolution Signal B. The controller is seeing extra signal events or noise in the B reference channel.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the controller for P0376 before checking noise, shielding, and the physical trigger source.

Symptoms of P0376

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0376

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Review signal B pulse count, RPM spikes, freeze-frame conditions, electrical noise history, and comparison with signal A behavior.
Inspect shielding, sensor air gap, trigger wheel damage, loose mounting, harness routing near ignition wiring, grounds, and connector fit.
Use a scope to identify double-triggering, noise spikes, vibration-induced transitions, or distorted signal edges.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.