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).
    1. 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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Comments 6

Jason gray

May 11, 2019

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

Jonathan

June 4, 2019

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

Lydia Krupicka

June 9, 2019

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

Brandon Jones

November 16, 2019

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.

Jay

October 29, 2019

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?

David

November 25, 2019

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

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