2004 Chrevo 15 passenger van/3500 series. Three

p0327 knock sensor bank 1 circuit low input indicates possible short in wiring for sensor

knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor on Bank #1 is generating a low output voltage (perhaps under 0.5V), then it will trigger a P0327 DTC. This P0327 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0325, P0326, P0328, P0329, P0330, P0331, P0332, P0333, and P0334.

Read more at: https://www.obd-codes.com/p0327

it can wait a little longer wouldnt leave for to long
http://www.obd-codes.com/p0327

Code P0327 indicates that the readings from the #1 Knock Sensor circuit are too low, is outside of its operational window and malfunctioning. Symptoms

• Check Engine Light will illuminate
• Engine pings on accelration
• Engine may be running hotter or colder than normal
• In rare cases, the engine may not exhibit noticeable symptoms

Common Problems That Trigger the P0327 Code

• Defective Knock Sensor
• Defective Knock Sensor Circuit or connections
• Defective EGR System
• Malfunctioning Cooling System
• Rich air/fuel ratio

Common Misdiagnosis

• Knock Sensor replaced when cause of code P0327 was a cooling system problem
• Knock Sensor replaced when cause of code P0327 was an EGR system malfunction

P1153 = Bank 2 Fuel Control Shifted Lean
P0327 = Knock Sensor 1 Circuit Low Input (Bank 1 or Single
Sensor)

Info obtained on: http://www.troublecodes.net/OBD2/Pcodes/

The P0327 means Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor).
the knock sensor is located in the front of the engine located behind the oil dip stick just to the left.
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Ktag K-TAG

P0327 - Knock Sensor 1 Circuit Low Input Bank 1 or Single Sensor
First check the knock sensor connector. If the connector is clean and secure, replacing the knock sensor usually takes care of the problem.

- An excessively low voltage from the sensor is sent to Powertrain Control Module (ECM) or Engine Control Module (ECM)

The knock sensor is attached to the cylinder block. It senses engine knocking using a piezoelectric element. A knocking vibration from the cylinder block is sensed as vibrational pressure. This pressure is converted into a voltage signal and sent to the Powertrain Control Module (PCM) or Engine Control Module (ECM).

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of Power

Possible causes
- Knock sensor circuit short to GND.
- Knock sensor circuit short to PWR.
- Knock sensor circuit open.
- Damaged knock sensor.
- Faulty Powertrain Control Module (PCM) or Engine Control Module (ECM).


Test and check it. Hope helps.

This code relates to the knock sensor circuit. Replace the sensor and the light will go out. This will allow the engine to pass the emissions test. Hope this helps...

The knock sensors (KS) produce an AC signal when specific frequencies are detected. When the engine operates, the powertrain control module (PCM) learns a minimum and maximum frequency of noise of normal engine operation. The KS system monitors both knock sensors in order to determine if knock is present. If the KS system determines that excessive knock is present, the PCM retards the spark timing based on the signals from the KS system. The PCM then retards the timing until no knock is present. When the PCM detects a frequency that is less than or more than a defined range, DTC P0327 will set for a failure in KS 1 which is located on bank 1 on the drivers side of the engine or DTC P0332 will set for a failure in KS 2 which is located on bank 2 on the passenger side of the engine.
But, the problem doesnt have to be the sensor, it could be bad ignition coil, bad spark plugs, bad/no/too much Fuel.......

P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor). This is mounted right on the block with a pigtail connector attached to it. Easy to replace and cheap.

The hard starting is caused by the
P0336 Crankshaft Position Sensor. Again, not overly difficult.