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P0389 Generic (SAE) Basic entry

Crankshaft Position Sensor 'B' Circuit Intermittent

Updated 2026-10-02 · Ignition system & misfires

Severity
Medium
Typical repair cost
40 – 350 EUR
System
Powertrain

What it means

P0389 is stored when the Crankshaft Position Sensor 'B' signal drops out or jumps erratically for short periods. Intermittent faults are almost always connector, wiring or vibration related.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

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Symptoms

  • Flashing or steady check engine light
  • Engine shaking, especially at idle
  • Loss of power under load
  • Fuel smell from the exhaust
  • Risk of catalytic converter damage if ignored

Common causes

  1. Damaged, chafed or corroded wiring in the Crankshaft Position Sensor 'B' circuit
  2. Corroded, loose or water-damaged connector terminals
  3. Failed Crankshaft Position Sensor 'B' component (sensor, solenoid or actuator)
  4. Poor ground connection for the module or component
  5. Faulty control module driver (rare, confirm all else first)

How to diagnose

  1. Read freeze frame data and note when the code set (cold start, under load, after rain)
  2. Inspect the Crankshaft Position Sensor 'B' connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
  3. Measure supply voltage and ground at the connector with the key on
  4. Check the signal wire for shorts to ground or battery and for continuity to the control module
  5. Test or substitute the Crankshaft Position Sensor 'B' only after wiring and connectors are confirmed good
  6. Clear the code and complete a drive cycle to confirm the repair

Frequently asked questions

Can I keep driving with P0389?

Usually yes for a short time, but expect reduced performance or higher fuel use. Have it diagnosed within a few days.

Will clearing P0389 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

P0386P0387P0388

Nearby codes in this group