P0332 code definition
If the knock sensor 2 circuit gives a low input signal, the PCM (powertrain control module) record a P0332 code and illuminate the Check Engine Light.
What the P0332 code means
The knock sensor’s purpose is to signal to the PCM when the engine is pinging. If the PCM is receiving a reading from the knock sensor that is too low, it will not be able to accurately send the appropriate signal of a ping, and the PCM will not be able to correct the problem. This can result in higher emissions and other problems for the engine, as well.
What causes the P0332 code?
When a P0332 code is stored, the most common causes are:
- A faulty knock sensor
- A fault in the knock sensor circuit or its connectors
- An air/fuel ratio that’s too lean
- A problem with the cooling system
- A defective EGR (exhaust gas recirculation) system
What are the symptoms of the P0332 code?
In some rare cases, there will be no other symptom besides the Check Engine light coming on. Most times, though, you will notice one or more of the following symptoms:
- Pinging in the engine when accelerating
- Increased engine heat under normal operation
- Lack or loss of power
How does a mechanic diagnose the P0332 code?
After verifying the code with an OBD-II scanner, the mechanic will then begin with a visual inspection of the sensor and its circuit. They will then likely use an ohmmeter and other diagnostic tools to test the circuit, connectors, and other related components.
After each test and/or repair, they will clear the code from the PCM and retest the system by turning the vehicle on. In some cases, they will take a short or extended test drive to ensure that there is not an intermittent problem that needs to be addressed.
Common mistakes when diagnosing the P0332 code
The most common mistakes associated with this code have to do with a failure to properly inspect and diagnose the root of the problem. In some cases, a knock sensor will be replaced when the problem was actually with the wiring or connectors. In other cases, the problem could be the cooling system or EGR system, in which case replacing the knock sensor will not do anything to resolve the issue.
How serious is the P0332 code?
Engine pinging can take a serious toll on an engine’s ability to run cleanly and efficiently. If the knock sensor is malfunctioning, the PCM cannot get the proper information from it to predict and correct for the problem. This can lead to an engine that runs rough, overheats, has decreased fuel efficiency, and other problems, as well.
What repairs can fix the P0332 code?
Some of the repairs that most commonly fix a P0332 code are:
- Replacing frayed or broken wires and connectors in the sensor circuit
- Ensuring that the sensor and circuit are properly grounded
- Replacing the knock sensor
- Addressing the root cause in the EGR or cooling system
- Replacing or reprogramming the PCM (rare)
Additional comments for consideration regarding the P0332 code
Even if you notice no other issues or symptoms with your vehicle, the P0332 code will result in an illuminated Check Engine light. If this light is on when you go in for an OBD-II emissions test, your vehicle will not pass. In most states, and with most vehicles, this means that you will not be able to legally register your vehicle or renew your registration. Getting this issue resolved early can avoid a lot of headaches, as well as more involved and expensive repairs down the road.
Need help with a P0332 code?
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