Richard McCuistian, ASE Certified Master vehicle Technician

Technical Reviewer at

Written by Staff authors - updated on June 3rd, 2021

Your automobile is equipped v a number of sensors the are supplied for surveillance all type of information. Amongst them is the hit sensor, which is a listening an equipment located near the engine that detects vibrations resulted in by engine detonation or “knock.”

P0327 is among several trouble codes concerned a faulty punch sensor. If her scan device is reflecting this code, read on to learn more about the symptoms, probable causes, and other pertinent information

What go the P0327 code Mean? 

Diagnostic trouble password (DTC) P0327 means “Knock Sensor 1 Circuit low Input (Bank 1 or solitary Sensor).” the is triggered when the powertrain control module (PCM) detects an extremely low voltage readings from your vehicle’s main knock sensor circuit. 

Take note that the voltage value might vary relying on your vehicle’s make and also model. 

For an thorough discussion the what knock sensors are and also how they work, check out our explanation here.

You are watching: Knock sensor 1 circuit low input

Some engines will have actually the hit sensor screwed into the next of the engine block.

Knock Sensors in various Vehicles

Some early knock sensors receive a 2.5 volt feeding from the Engine Controller that adjust when engine punch is detected, and if this voltage is shorted come zero or rises to 5 volts, a password is set.

Some V engines will have 2 hit sensors in the sink under the intake, and also on those engines, the punch sensors are in “wells” spanned with a rubber grommet. If a grommet leaks, water will certainly flood the sensor and also ruin it. This happens a lot of on the 4.8/5.3/6.0L Chevy V8s.

Some engines will have the hit sensor screwed right into the side of the engine block and also occasionally one will certainly actually it is in sensing the knock with the coolant in the next of the engine cooling jackets.

See more: Finding The Area Of A Circle As A Function Of Its Radius ​, Area Of A Circle (Video)

A poor knock sensor have to not be taken lightly due to the fact that it may result in engine damage.