Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is not getting a signal it needs to help the engine run smoothly. It's like trying to listen to music, but the radio is silent.
The engine control module (ECM) is not receiving the high-resolution signal from the crankshaft position sensor B, which it uses to determine the precise position of the crankshaft for optimal engine timing.
P0379 indicates that the ECM has detected a lack of pulses from the high-resolution signal B, which is typically generated by the crankshaft position sensor. This signal is crucial for the ECM to manage ignition timing and fuel injection accurately.
• Check Engine Light illuminated
• Engine may not start or may stall
• Poor engine performance
• Faulty crankshaft position sensor B
• Wiring issues or poor connections in the sensor circuit
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the crankshaft position sensor B.
• Test the crankshaft position sensor B for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the crankshaft position sensor B if faulty.
• Replace or reprogram the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect and maintain engine sensors.
• Ensure all electrical connections are secure.
• Follow the vehicle's maintenance schedule.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle diagnosed by a professional if unsure.
• Regular maintenance can prevent such issues.
Check if the vehicle's powertrain warranty covers sensor replacements.
P0379 has been a common issue in vehicles with aging crankshaft sensors or wiring problems.
Moderate – The vehicle may still operate, but performance issues can worsen over time.
Driving with a faulty sensor can lead to increased emissions and potential safety risks.
• Engine at operating temperature
• Vehicle in a safe, stationary position
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 P0379 code?
A: It's possible, but not recommended as it can lead to poor engine performance and increased emissions.
Q: How do I reset the P0379 code?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
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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.