Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means the car's computer is having trouble getting a steady signal from a sensor that helps it know how the engine is spinning. It's like when your TV signal keeps cutting in and out.
The engine control module (ECM) is receiving an inconsistent signal from the crankshaft position sensor B, which is crucial for timing the engine's functions.
The crankshaft position sensor B provides the ECM with information about the position and rotational speed of the crankshaft. An intermittent signal can cause the ECM to miscalculate the engine's position, affecting engine performance and efficiency.
• Engine misfires
• Difficulty starting the engine
• Engine stalling
• Faulty crankshaft position sensor B
• Damaged or corroded wiring or connectors
• ECM malfunction
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the crankshaft position sensor B and its wiring for damage.
• Test the sensor's output with a multimeter.
• Replace the crankshaft position sensor B if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect and maintain engine sensors.
• Ensure wiring and connectors are free from corrosion.
• Keep the engine compartment clean to prevent debris buildup.
Sensor Issue
• Do not ignore the check engine light.
• Have your vehicle inspected by a professional if you experience symptoms.
• Regular maintenance can help prevent sensor issues.
Check your vehicle's warranty; some powertrain warranties may cover sensor replacements.
This code has been common in vehicles with aging sensors or those exposed to harsh conditions.
Moderate – While the vehicle may still run, ignoring this issue can lead to more severe engine problems.
Driving with a malfunctioning sensor can lead to safety issues and increased emissions.
• Engine at operating temperature
• Vehicle stationary
The crankshaft position sensor B is typically located near the engine's crankshaft, often at the front or rear of the engine block.
Q: Can I drive with a P0389 code?
A: It's possible to drive for a short period, but it's not recommended as it can lead to engine damage.
Q: How long does it take to fix a P0389 code?
A: Repair time can vary, but it typically takes 1-2 hours depending on the vehicle and the complexity of the repair.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.