What happens if a knock sensor fails on a Chevy Silverado?

Knock sensors play an important as well as essential role in your Silverado’s engine functionality, detecting any engine noises caused by early detonation and adjusting the ignition-timing accordingly. When a knock sensor fails, detonation is not properly regulated and serious engine damage can occur, leading to some very costly repairs.

Is there a knock sensor problem on my Hummer?

In fact, if you have a 4.8 L 5.3 L or 6.0 L in any General Motors vehicle, including a Hummer or Pontiac, you will probably run into a check engine light indicating a defective knock sensor at some point.The check engine light registering a code P0332 or a P0327 is often the first sign you have this common problem.

What are the codes for the knock sensor?

Eventually this turns on the check engine light and sets the codes P0332 and P0327. Note that often either one or the other code will set. Regardless if one or both codes are set, not only should the two original knock sensors be replaced, but you should also replace the harness.

Can a bad knock sensor cause engine damage?

A bad knock sensor can cause some serious engine damage. Before that happens, check out this handy guide on replacing knock sensors in your Silverado. This article applies to the Chevrolet Silverado GMT800 (1999-2006).

Where is the knock sensor on a Chevy 6.0?

In Chevy 6.0 engines the knock sensor sits underneath the intake manifold in the lifter section. The sensor is responsible for measuring engine vibrations and detecting if there are any unusual vibrations, aka if any “engine knock” is occurring. Engine knock happens when a gasoline burns unevenly in a cylinder.

Why does my Vortec 6000 make a knocking noise?

If you get a check engine light and codes for engine knock on your 6.0L vortec, it could be actual engine knock. However, if you do not hear any knocking noises but do have a CEL, you likely have a bad knock sensor. On the 6.0 engine, the knock sensor has a pretty crappy sealant on it which can cause water to enter the sensor.

What are the symptoms of a bad knock sensor?

Symptoms of a bad knock sensor include a check engine light, loud thumping noises coming from the engine, or shaking, vibrating, and misfires on a cold start. Keep reading as this article will show you how to replace a faulty knock sensor in your Silverado before costly damages occur.

Where are the knock sensors on a V8?

RESISTANCE SPECIFICATION: The resistance specification of knock sensor 1 is 93 to 107 K Ohms. Place your multimeter in Ohms mode. Disconnect the knock sensors jumper wiring harness . The knock sensors jumper wiring harness is located on the left side (driver side) of the intake manifold. See photo above.

What kind of sensor does a Chevy Silverado have?

You can find this tutorial in Spanish here: Cómo Probar Los Sensores De Detonación (1999-2006 V8 Silverado, Sierra, Suburban, Tahoe, Yukon) (at: autotecnico-online.com ). P0327 -What Does It Mean? (1999-2006 V8 Chevrolet Silverado, GMC Sierra).

What is the labor cost to replace knock sensor?

Based on these factors, the costs to replace a knock sensor professional can range anywhere from $175 to $500 . Labor tends to be in the $125 to $300 range, whereas parts, again, highly dependent upon the car you drive, can range anywhere from $30 to $80+

Do you have to replace your knock sensor?

Typically, the knock sensor is mounted on the engine block or cylinder head. Some engines have more than one sensor. The only way to fix a bad knock sensor is to replace it . You or your mechanic should test the sensor before declaring that it’s the problem.

How much to replace knock sensor please?

The good news is that it won’t cost you an arm and a leg to replace a bad knock sensor. If you have a standard economy vehicle, you can expect to pay anywhere from $120 to $500 for replacing your knock sensor. The parts cost will be anywhere from $65 to $200, while the labor costs will be anywhere from $50 to $350.

Can You unplug the knock sensor?

The knock sensor is mounted on front of your engine, near the fuel injector. On some vehicles you may have to remove hoses or the air box cover to access your knock sensor. Unplug the wiring harness from your vehicle’s knock sensor once you have found it.

What is a knock sensor on a truck?

Your knock sensor is an electrical device on your truck, car or Sport Utility vehicle that detects knocks in your engine caused by premature detonation of the air-fuel mixture as it enters the cylinder head.

What does DTC stand for on knock sensor?

Diagnostic trouble code (DTC) P0327 stands for “Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor).” It is triggered when the powertrain control module (PCM) detects very low voltage readings from your vehicle’s primary knock sensor circuit.

How much does it cost to replace a knock sensor?

How does the knock sensor on a Chevy truck work?

The knock sensor sends a signal to the PCM (the truck engine’s computer) to tell the computer about ignition timing. The knock sensor uses two flat-response two-wire sensors. They produce voltage based on engine vibration and noise level.

How long does it take to replace knock sensors on a 5.3L?

I know the last time I replaced knock sensors on a 5.3L, I spent the day BS-ing in my garage and it took about 5 hours total. That included lunch. Does anybody know what the actual “piece rate” for the repair is?

Where is the jumper for the knock sensors?

Below are the circuit descriptions of the 2 wires of the knock sensors jumper wiring harness. The knock sensors jumper wiring harness connector is located on the left side (driver side) of the intake manifold. See photo 2 of 2 in the image viewer above.

When did I replace the knock sensor on my Silverado?

So my ’01 Sierra’s SES light started coming on a few months ago so I pulled up the code and sure enough got the P0332 Knock Sensor code. I just replaced the knock sensors and harness less than a year and maybe 10K miles ago so I decided to clear the code and see if it came back.

What kind of car has a knock sensor?

Knock sensor problems are common on 1999-2007 Chevy Silverado, Express Van, Tahoe and Suburban trucks. Of course, this means that the GMC Sierra and Yukon of the same years have the same issues.

What happens when a knock sensor goes bad?

When a knock sensor fails, detonation is not properly regulated and serious engine damage can occur, leading to some very costly repairs. Symptoms of a bad knock sensor include a check engine light, loud thumping noises coming from the engine, or shaking, vibrating, and misfires on a cold start.

How to test knock sensors ( 1999-2006 V8 )?

NOTE: The above knock sensor and related components fit the following vehicles: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 V8 Chevrolet Silverado, Suburban, Tahoe and GMC Sierra, Tahoe, Tahoe XL. Testing knock sensor 1 simply involves testing its resistance with a multimeter in Ohms mode.

Is there a knock sensor for MY Suburban?

My ’03 1500 Suburban was consistently getting a P0332 code and occasionally a P0327 code and SEL too. After careful consideration I went with this kit which is about 1/2 the price of OEM, even though I heard some questions about the quality in general of aftermarket knock sensors. When the order arrived it was missing a knock sensor.

What should I buy for my knock sensor?

Perfect for my 2005 Silverado 1500 5.3L. Make sure to buy intake manifold gaskets and silicone to seal the knock sensor caps to prevent any future problems. Perfect for my 2005 Silverado 1500 5.3L. Make sure to buy intake manifold gaskets and silicone to seal the knock sensor caps to prevent any future problems.

What do I do if my Chevy Silverado makes a ticking noise?

Once the noisy cylinders have been located, the head will have to come off next. This involves removing the intake, exhaust manifolds, rockers and stands, sensors and wiring, accessories, etc. Actually it isn’t that bad of a job to take one of these engines apart, and I always do this with the engine still in the truck.

How do you replace a Chevy Silverado engine?

If you have a 2003 and up Silverado, you also need to unplug the drive-by-wire harness. Remove the throttle cable bracket from the intake manifold, and push the bracket along with the cables off to the side. Unbolt the main engine harness bracket on the driver’s side of the intake manifold.

Where are the knock sensors on a 6.0L?

Install the wiring harness assembly to the knock sensor. Apply a bead of RTV silicone sealant approximately 9 mm (3/8 in) wide and 6 mm (1/4 in) high along the outside edge of the ridge on the engine block valley cover around the rear bank knock sensor. DO NOT form a complete circle.

Where is the knock sensor on my car?

Find the knock sensor on your car, truck or SUV. The knock sensor is mounted on front of your engine, near the fuel injector. On some vehicles you may have to remove hoses or the air box cover to access your knock sensor. Unplug the wiring harness from your vehicle’s knock sensor once you have found it.

Where is the return line on a Chevy Silverado?

1999 to 2003 Silverados have a supply and return line, while 2004 and up Silverados do not have a return line. Use the fuel line removal tool to remove the EVAP line located between the engine and the firewall. Figure 2. Remove the fuel lines from the fuel rails. Unplug as well as remove all eight fuel injectors and connectors.

Where are the knock sensors on a Chevy Silverado?

The knock sensors are located underneath the black plugs connected to a wire harness. Pull the plugs out and unbolt both knock sensors using a 22mm deep well socket. Install the new sensors and torque them to exactly 15 ft-lbs. Apply some RTV to the rubber plugs to prevent water from entering.

Why is the knock sensor on my car only one wire?

If drive around with the check engine light on when a code P0332 or a P0327 is set in the computer memory, engine damage could occur. To me the most interesting part about the knock sensor is that it only has one wire going to it. The reason for this is the sensor generates its own voltage and is case grounded.

Are there knock sensors on a Silverado 5.3?

I installed 2 new knock sensors in my 2001 Silverado 5.3 after getting the P0332 code. Also installed a new harness, cleaned everything, RTV sealed the plugs, etc…

Are there any knock sensor problems on GM trucks?

Knock Sensor Problems on GM Vehicles. Knock sensor problems are common on 1999-2007 Chevy Silverado, Express Van, Tahoe and Suburban trucks. Of course, this means that the GMC Sierra and Yukon of the same years have the same issues.

Do you need to replace the knock sensor?

Regardless if one or both codes are set, not only should the two original knock sensors be replaced, but you should also replace the harness. In fact, it will most likely shatter like glass when you attempt to disconnect it. The replacement harness comes complete with new connectors and boots.

Where are the knock and Ping sensors located?

It’s a piezoelectric automotive sensor that produces a small voltage signal when it hears internal engine noise that we often call knock and ping. This is why the location of the two sensors is a problem. In order to hear the engine noise reliably the sensors are buried under the intake manifold.

Why does my knock sensor keep collecting water?

This location can collect water over time under the right circumstances. This wouldn’t be an issue if the knock sensor harness stayed pliable and sealed the connection.Again, because of the location, these rubber boots that seal the connector deteriorate and shrink over time.

What happens if a knock sensor fails on a Chevy Silverado?