P0389 Code - Crankshaft Position Sensor 'B' Circuit Intermittent

What Does P0389 Mean?

OBD-II Code Decreased engine performance is defined as a Crankshaft Position Sensor "B" Circuit Intermittent

The Crankshaft Position Sensor measures the exact rotational speed and position of the crankshaft. This provides a critical data signal used by the Powertrain Control Module (PCM) to control Ignition Spark Timing and Fuel Delivery. This sensor may be built into the distributor on older vehicles. When the PCM detects an irregular signal or no signal, it will set code P0389.

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What are the common causes of P0389 ?

Depending on year, make, and model, DTC P0389 may have number of causes, pretty much the same as those causing DTCs P0385, P0340 or P0345:

• Faulty Sensor – If the sensor is open or shorted, due to age, damage, or corrosion, a weak signal or no signal will be generated.
• Poor Installation – A good CKP signal is highly dependent on sensor placement. Generally, the sensor needs between 0.020” and 0.050” clearance to the reluctor ring. If the sensor is cocked to one side or not firmly seated, the clearance will be wrong and the signal will be too weak for the ECU to detect. If the reluctor ring is rubbing the sensor, the signal will be distorted.
• Ford Trucks / Mustang GT – An alternator phase problem, such as a blown diode or open coil, may cause so much electrical interference it distorts the CKP signal, causing DTC P0389, in spite of there being no actual problem with the CKP sensor or wiring.
• Cars in Storage – Unfortunately, while looking for nesting materials and cleaning house, these little critters might find your wiring offensive or even tasty, resulting in open circuit problems.
• Older Cars – Over time, plastic and rubber tends to become brittle and less flexible, which can lead to connector breakage and wire insulation damage. In turn, this may cause corrosion, open circuits, or short circuits.

How do you troubleshoot P0389 ?

• Crank position sensor replacement
• CPS sensor and wiring replacement
• Cam gear or reluctor ring replacement

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