Engine error codes are helpful for pinpointing problems that would be hard to determine otherwise. Today we will be talking about error code P0161 on a Chevrolet Silverado.
So, what does P0161 Chevy Silverado mean?
P0161 in a Chevy Silverado means, “Oxygen O2 sensor circuit has low voltage (bank 2, sensor 2).” This means your Chevy Silverado engine’s ECU has detected excessive resistance or a short in the downstream O2 sensor’s heating circuit located on bank 2. This P0161 code appears and can be caused by a fault in the sensor itself or damaged wiring. In rare cases, a defect in the PCM can also trigger this code.
Now that we understand the error code’s basic causes, let’s get on with the solution.
| Reasons | Solution |
|---|---|
| Faulty O2 Sensor | Replace the O2 sensor |
| Poor or Damaged Wiring | Replace the O2 sensor Connectors |
| Defective ECU | Contact a professional |
Is the P0161 Chevy Silverado Code Serious?
If you’re having a panic attack because of this P0161 code on your Chevy, we’d suggest you calm down. This code is not that serious, and the consequences of it aren’t either.
Having this P0161 code on your Silverado won’t cause you issues with driving the vehicle; there should only be increased emissions. However, it would be best if you still had your car checked out by a professional mechanic. The reason behind checking with a professional is that ignoring this error code for a long time can cause engine damage and cost you a lot more later.
P0161 Chevy Silverado: How to Fix It?
There are several causes of code P0161 Chevy Silverado, and the solutions are dependent on the reason for the code. But before that, knowing the symptoms of P0161 is necessary.
The main P0161 Chevy Silverado symptom is the “Check Engine” light. Other than this, your engine may have decreased fuel economy, rough running, and increased emissions.
Now let’s discuss the causes and solutions of fault code p0161 Chevy Silverado-
Reason One: Faulty O2 Sensor
The first reason that may trigger this code is a malfunction in the O2 sensor. So, you need to check your O2 sensor to see if it’s really working.
Diagnosis
The error code p0161 Chevy Silverado tells you that the bank 2 sensor has low voltage. So, to solve code P0161, the bank 2 sensor 2 location is a must-know.
Bank 2, sensor 2, is located on the passenger side, behind the catalytic converter. To access and diagnose the O2 sensor, you can follow the steps below-
- Get under the vehicle on the passenger side. The oxygen sensor should be attached to the exhaust.
- Warm the vehicle up for about 5-20 minutes to get it to operating temperature.
- Disconnect the wiring harness of the sensor.
- Connect two wires to the signal and the ground wire.
- Connect the probes to the wires that were attached.
- Set the multimeter to 20 volts.
- The meter should give you a reading between 0.1-1 volt.
If the voltage is not in the recommended range, that means the sensor is not sending a signal to the ECU. This means the O2 sensor is at fault.
Solution
If the O2 sensor is not working properly, you will have to replace it. Watch the video below for a step-by-step guide for replacing the O2 sensor in a Chevy Silverado.
Reason Two:
If the sensor is alright, you need to check the relevant wirings next.
Diagnosis
- Turn on the ignition but do not start the engine.
- Disconnect the sensor wires; you should see four pins on the connector.
- Use the multimeter to measure the voltage of the signal and ground pin. The voltage should be around 1 volt. If the voltage reading is not fine, then that means the sensor is not getting power from the vehicle.
Now you will have to measure the resistance on the sensor side wiring. To do that-
- Set the multimeter to measure ohms.
- Place the probes on the signal and ground wires; the resistance should be between 5-7 ohms.
Solution
If there is a problem with the connectors, you will have to replace the wiring harness for the O2 sensor. Here is how you can do it-
Replace the o2 Oxygen Sensor Harness Pigtail Connector 2009 Chevrolet Silverado.
Reason Three: Defective PCM
A defective PCM can also trigger the p0161 error code. But it is highly unlikely, as a defect in the PCM is very rare.
If the PCM is malfunctioning, you can experience many other symptoms along with the symptoms of the failed O2 sensor. But what are the symptoms of a faulty PCM?
With a faulty PCM, you’re likely to have trouble starting your car, engine stalling, and shifting issues. On top of that, you’re likely to experience multiple error codes that are related to PCM. For example, P0606, P0603, P0113, U0100 etc.
Solution
If you suspect your PCM is not functioning like it’s supposed to, have your vehicle checked by a professional as soon as possible.
O2 Sensor Maintenance Guide
To prevent the p0161 error code Chevy Silverado, you should take care of your O2 sensors.
O2 sensors usually last from 60,000 to 90,000 miles, so have your O2 sensors replaced within that period. Also, you can clean your O2 sensors once every couple of months to maintain their functionality. But how do you clean your O2 sensors?
Here are the steps you can follow in cleaning your O2 sensor-
- Disconnect your O2 sensor. To make it easier to remove, spray the sensor with WD-40 and let it sit for 10-15 minutes.
- Fill a bucket with gasoline. When to get the bucket, remember to ask for buckets that can contain gasoline.
- Drown the O2 sensor in gasoline, then cover the bucket with a lid. Keep it there for the night.
- When you take the sensor out, dry it with a clean cloth and put it back in its place.
FAQs
Can I drive with a damaged O2 sensor?
No, it would be best not to drive with a damaged O2 sensor. If you try to drive with a damaged O2 sensor, it may clog your catalytic converter over time.
Should I replace all O2 sensors at once?
No, you do not need to replace all the O2 sensors simultaneously. But it would be best if you replaced them as a pair. For example, if you need to replace one upstream O2 sensor, you should replace both instead of just one.
Is it okay to use aftermarket O2 sensors?
It might be okay to use aftermarket O2 sensors, but it is best to use OEM parts. OEM parts will cost you more, but they are worth their money.
Conclusion
To sum it all up, P0161 Chevy Silverado is not that serious of a problem. But if you ignore it, it can become a bigger issue. So, the sooner you solve it, the better.
If the methods we have described seem confusing or are beyond your skill level, feel free to consult a professional.
Last Updated on April 9, 2024 by Rifen
