Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble with a test it runs on a part that listens for engine knocking noises. It's like if your teacher gave you a test, but you couldn't finish it because something was wrong with the paper.
The P1386 code indicates a problem with the control module's ability to perform a self-test on the knock control circuit for Bank 1.
The Engine Control Module (ECM) performs a self-test on the knock control circuit to ensure it can detect engine knocking. If the self-test fails, the ECM triggers the P1386 code. This can be due to a malfunction in the knock sensor, wiring issues, or the ECM itself.
• Check Engine Light illuminated
• Poor engine performance
• Engine knocking noise
• Faulty knock sensor
• Wiring issues or poor connections
• Faulty Engine Control Module (ECM)
ECM: Engine Control Module
Knock Sensor: A device that detects engine knocking or pinging
• Use an OBD-II scanner to confirm the code.
• Inspect the knock sensor and its wiring for damage.
• Test the knock sensor for proper operation.
• Replace the knock sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $500
Moderate
• Toyota Camry
• Honda Accord
• Ford F-150
• Regular maintenance checks
• Ensure proper engine tuning
• Use high-quality fuel
Sensor Issue
• Avoid driving aggressively until the issue is fixed.
• Get the vehicle checked by a professional mechanic.
Check with your vehicle manufacturer for warranty coverage on the ECM and sensors.
This code has been associated with issues in vehicles where the knock sensor or its circuit has been compromised, often due to age or environmental factors.
Moderate – While the vehicle may still be drivable, addressing this issue promptly can prevent further engine damage.
Ignoring this code can lead to engine damage, which may not be covered under warranty if neglected.
• Engine at operating temperature
• Vehicle at idle
The knock sensor is typically located on the engine block, cylinder head, or intake manifold.
Q: Can I drive with a P1386 code?
A: It's not recommended to drive for extended periods with this code, as it can lead to engine damage.
Q: How do I reset the P1386 code?
A: After fixing the issue, use an OBD-II scanner to clear the code from the ECM.
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