Ignition Systems ControlOBD2 Codes

P0332 – Meaning, Causes, Symptoms, & Fixes


Code P0332 Definition

Knock Sensor 2 Low Circuit Input (Bank 2)

What Does P0332 Mean?

Knock sensors are solely used for the purpose of sensing when your engine is “knocking,” or sensing when there is exploding in the air/fuel mixture in a way that delivers less power and can also damage the engine if prolonged. When the engine “knocks” there is an excessive amount of NOx that is released. When trouble code P0332 is set, the Power Control Module (PCM) has received a reading from knock sensor 2 in Bank 2 that is too low, and it will not be able to accurately send a ping to correct a problem.

P0332 Symptom

  • Check Engine Light
  • Higher emissions
  • Loss of power
  • Pinging in the engine
  • Lower fuel economy

P0332 Causes

  • Faulty knock sensor
  • Fault in the knock sensor circuitry
  • Faulty EGR system

Code P0332 Severity – High

Pinging damages the lifetime of a vehicle’s engine and can affect its ability to run cleanly and efficiently. The PCM cannot get the correct information if the knock sensor is malfunctioning and can damage the lifetime of the engine.

Code P0332 Common Diagnosis Mistakes

Replacing the knock sensor whenever the issue lies with the wiring or connectors that could have been diagnosed by inspection.

P0332 Diagnosis

  • Tools Needed to Diagnose:

Difficulty of Diagnosis and Repair – (1-4)

  1. Check to see if there are any other codes along with P0325 and clear your Check Engine Light with FIXD
  2. Test drive the vehicle and attempt to replicate the driving conditions that will also give similar if not the same freeze frame data in an attempt to pinpoint the issue.
  3. Is the knock sensor sending a signal to the PCM? If so, there may be an issue with the coolant temperature readings. If not, the knock sensor may need to be replaced (Step 5). If there are issues with the coolant temperature readings, deal with them ASAP because an overheated engine can definitely cause the engine to knock.
  4. Conduct a visual inspection of the knock sensor wiring, and any connections to the knock sensor to make sure there are no signs of disconnection, tearing, etc.
  5. If the conclusion is that the knock sensor needs to be replaced, then it is often recommended to replace not only the sensor but the knock harness as well.

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  1. Thanks, good advice, but how do you change the knock sensor.

    1. Depends on vehicle but you take off the intake manifold now keep in mind you will need a new intake gasket. You will also need a fuel line disconnect tool very cheap for a set then a few other tools and start tearing apart. Go on YouTube to watch 1a auto they have good videos

  2. feel cool AIR but fan will not blow. How can fix?

    1. that sounds like a blower motor problem. Make sure your getting power to the blower motor. If you are then replace your blower motor. It’s very simple you could go on YouTube and look it you or you could simply go behind your glove box it’s very simple fix.

  3. Having this problem with my 2003 Silverado 1500 5.3 engine. I replaced both knock sensors and the harness. Both new sensors ohm check good, 99K ohms across them. I replaced the wiring harness at the same time. Now, i get the DTC for BOTH knock sensors. I double checked the continuity of the harness, get the same resistance as testing at the sensor itself. Any ideas on what the problem is?

    1. I have done the exact same thing. GM parts, 15 ft lbs torque. Everything, still both knock sensor codes. Anybody got any ideas?

    2. Have you cleaned/ replaced the egr valve?

    3. I have a 2003 GMC Sierra 2500hd 6.0l. I have been having a problem being able to get rid of a p0300 random misfire code. Recently I scanned my truck and not only did I still have the p0300 but I also had the p0332 knock sensor bank 2. After scanning my truck I cleared the codes by disconnecting the battery terminals but when I reconnected them and tried to start the truck all it will do is crank but will not start. I checked all the fuses the fuel delivery and numerous wiring which all of that checked out fine. When I checked to see if I had spark I found that I now have no spark on all 8 cylinders. My question is can a knock sensor cause me to have no spark on all cylinders.

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