Powertrain, generic · Ignition system or misfire

P0376 Timing Reference High Resolution Signal B Too Many Pulses

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Some diesel systems give the injection control a finely divided angle signal in addition to the normal reference signal – the high resolution signal – for precise injection timing and metering. P0376 means a second high resolution signal, B, delivers more pulses than expected within the reference window; it is checked in the same way as signal A (P0370 ff). No manufacturer with a separate signal B was found – GM's diesels with a high resolution signal (6.5-litre, Duramax LB7) only have signal A, and Ford and GM 2014–2019 do not use the codes. The description therefore follows the J2012 name, the analogy to signal A and CARB's monitoring requirement for crank angle sensors. Typically the engine loses power and runs roughly.

Likely causes

Sensor faulty or dirty
Loose contact or interference in the signal wire
Sensor disc or tone wheel damaged
Engine module

Symptoms

  • Check engine light on
  • Loss of power (limp-home fuelling)
  • Rough running, hard starting, smoke

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–1,500
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

high resolution timing sensorinjection pumpsensor wiringengine control module

Related codes

P0375P0377P0378P0379P0370

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.