Error code
OBD2 P0389
OBD2P0389
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Crankshaft Position Sensor 'B' Circuit Intermittent.
Severity
moderateCan drive but may experience intermittent starting/stalling.
Summary
P0389 indicates an intermittent issue with Crankshaft Position Sensor B's circuit in your vehicle.
Symptoms
- Check engine light (CEL) illuminated
- Intermittent starting or stalling
Common Causes
- Faulty sensor
- Poor installation of the sensor
- Wiring issues, such as loose connectors or damaged harness
- Electrical interference from alternator phase problems
- Rodents damaging wiring
Diagnosis
- Inspect all connectors for proper connection and damage to the harness.
- Check sensor resistance and signal using a digital multimeter (DVOM).
- Look for open circuits or short circuits in the wiring between ECU and CKP sensor.
Fixes
- Replace faulty crankshaft position sensor B if necessary.
FAQ
What can cause P0389?
Common causes include a faulty sensor, poor installation, wiring issues, electrical interference from alternator phase problems, and rodent damage.
How do I diagnose P0389?
Start with visual inspection of connectors and harness. Use a multimeter to check resistance and signal strength of the sensor.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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