P0379
PowertrainCrankshaft Camshaft Positionhigh severityTiming Reference High Resolution Signal B No Pulses
What P0379 Means
The PCM detected no high resolution timing pulses on signal B. This can prevent accurate timing and cause a no-start or stalling condition.
Symptoms
- Engine no-start or stalling
- Check engine light on
- Loss of timing reference
Common Causes
- Faulty timing sensor
- Open circuit in wiring
- Severely damaged tone ring
- Faulty PCM
Diagnostic Steps
- Retrieve codes and freeze frame
- Check sensor power and ground
- Inspect wiring for opens
- Test tone ring and replace sensor
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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