P0379
PPowertrainTiming Reference Signal B: No Pulses
What does this code mean?
Severity : HighP0379 means the engine control module sees no pulses on timing reference high resolution signal B, usually supplied by the crankshaft position sensor. This fine resolution signal lets the module measure engine rotation precisely. How it is used varies between makes, so the exact meaning depends on the manufacturer.
Symptoms
- Check engine light on.
- Long cranking or hard starting.
- Rough idle or stalling.
- Loss of power or limp mode.
- Related crankshaft or camshaft codes may also be stored.
Possible causes
- Faulty crankshaft position sensor.
- Open, shorted or poorly shielded wiring.
- Corroded or loose connector.
- Damaged reluctor ring.
- Engine control module fault.
Diagnosis and repair
- Read all stored codes and address crankshaft sensor codes first.
- Inspect the sensor harness and connector.
- Measure supply, ground and signal with a multimeter or oscilloscope.
- Check the condition of the reluctor ring.
- Replace the faulty part, clear the code and road test.
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Code
P0379
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012