September 01, 2020Updated: March 25, 2021By: Abraham Torres-ArredondoArticle ID: 1167 Show
A trouble code P0332: Knock Sensor No. 2 Circuit Problem usually tells you that the rear knock sensor has failed. In this tutorial, I'll explain what this trouble code means. I'll also talk about some of the tests you can perform to find its cause. NOTE: The knock sensor is also known as the detonation sensor. You can find this tutorial in Spanish here: Código P0332 ¿Qué Significa? (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon) (at: autotecnico-online.com). APPLIES TO: This tutorial, on the P0332 OBD II trouble code, applies to the following vehicles: Chevrolet:
GMC:
RELATED TROUBLE CODES:
What Does Trouble Code P0332 Mean?The 4.8L, 5.3L, and 6.0L engines comes equipped with 2 knock sensors. They're both located on the engine and underneath the intake manifold. A trouble code P0332: Knock Sensor No. 2 Circuit Problem lets you know that the rear knock sensor (located nearest to the engine compartment firewall) is not functioning properly. To be a bit more specific, this code tells you that the PCM is receiving an AC voltage signal from the knock sensor that is too low or too high. Common Symptoms Of A P0332 Trouble CodeDepending on the severity of the problem, you'll see one or more of the following symptoms:
What Does The Knock Sensor Do?The knock sensor is used to detect engine knock (also known as engine ping, spark knock, or engine detonation). If the engine is experiencing engine knock, the knock sensor will produce an AC voltage signal that's sent to the fuel injection computer. The amount of AC voltage that the knock sensor produces is proportional to the amount and strength of the engine knock. Once your Chevrolet Silverado or GMC Sierra's fuel injection computer receives the knock sensor's signal, it'll then retard ignition timing to reduce/eliminate the engine knock. What Causes A P0332 Trouble Code?In the majority of cases, a bad rear knock sensor is the cause of the P0332 trouble code lighting up the check engine light on your Chevrolet Silverado (Suburban, Tahoe) GMC Sierra (Yukon, Yukon XL). The 4.8L, 5.3L, and 6.0L engines are notorious for rear knock sensor failure from corrosion due to moisture. Other things that can cause a P0332 trouble code are:
How To Diagnose And Repair A P0332 Trouble CodeTroubleshooting and solving a trouble code P0332 usually involves replacing the rear knock sensor. Before replacing the knock sensor (since this bad boy is located underneath the intake manifold), I recommend the following:
You can find the knock sensor test explained in detail here: How To Test The Knock Sensors (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon). If you do replace the knock sensor, replace both the front and rear knock sensors and their wiring harness. Where To Buy The Knock Sensor And SaveIf you need to replace the rear knock sensor, then it's recommended that you should replace the front knock sensor and their wiring harness. Due to the amount of labor required to replace the knock sensors (you've got to remove the intake manifold), I want to also recommend that you avoid buying cheap brand-X knock-off knock sensors. The following links will help you comparison shop for these items of known brand names (AC-Delco, Dorman, Standard Motor Products): NOTE: The AC-Delco brand is the original equipment part for the Chevrolet Silverado and GMC Sierra. More Silverado, Sierra, Suburban, Tahoe, And Yukon TutorialsYou can find a complete list of V8 Chevrolet Silverado (Suburban, Tahoe) GMC Sierra (Yukon, Yukon XL) tutorials in this index:
Here's a small sample of the tutorials you'll find in the index:
If this info really saved the day, buy me a beer! What causes a knock sensor code P0332?P0332 can be caused by anything from damaged wiring to a bad knock sensor to an overheating engine. It's impossible to give an accurate estimate without properly diagnosing the issue first.
What is a knock sensor 2 circuit Low bank 2?An engine code P0332 means that knock sensor #2 is sending an output voltage to the PCM that is lower than the manufacturer-specified range. Without proper readings from the knock sensor, the PCM cannot accurately alter ignition timing to prevent engine knocking.
What can cause a false knock sensor code?The P0325 code indicates a possible problem with your engine's knock sensor.. Faulty knock sensor.. Circuit issues, such as damaged wiring and loose connections.. Issues with the PCM (rare). Internal engine problems.. How do you fix a knock sensor code?What repairs can fix the P0325 code?. Replacing the ECU.. Repairing or replacing the wiring harness.. Replacing a faulty knock sensor.. Repairing an electrical connection.. |