P116B 2018 GMC Sierra Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)
Quick Answer
The P116B diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the O2 signal circuit low voltage from the NOx sensor 1. Common causes include Faulty NOx Sensor: The most common cause of the P116B code is a malfunctioning or failed NOx sensor, Wiring Issues: Damaged or corroded wiring connections between the NOx sensor and the ECM can also trigger this code, ECM Malfunction: A problem with the engine control module that prevents it from receiving accurate data from the NOx sensor can lead to the P116B code. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P116B 2018 GMC Sierra indicates O2 Signal Circuit Low Voltage (NOx Sensor 1).
- Common causes
- Common causes include Faulty NOx Sensor: The most common cause of the P116B code is a malfunctioning or failed NOx sensor, Wiring Issues: Damaged or corroded wiring connections between the NOx sensor and the ECM can also trigger this code, ECM Malfunction: A problem with the engine control module that prevents it from receiving accurate data from the NOx sensor can lead to the P116B code.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P116B 2018 GMC Sierra Description
The P116B diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the O2 signal circuit low voltage from the NOx sensor 1. The NOx sensor, also known as the nitrogen oxide sensor, is responsible for monitoring the levels of nitrogen oxides in the exhaust gases of the vehicle. This sensor plays a crucial role in ensuring that the vehicle meets emissions standards and operates efficiently.
Common Causes of P116B 2018 GMC Sierra
- Faulty NOx Sensor: The most common cause of the P116B code is a malfunctioning or failed NOx sensor.
- Wiring Issues: Damaged or corroded wiring connections between the NOx sensor and the ECM can also trigger this code.
- ECM Malfunction: A problem with the engine control module that prevents it from receiving accurate data from the NOx sensor can lead to the P116B code.
- Exhaust System Leaks: Leaks in the exhaust system can affect the NOx sensor's readings and trigger the code.
- Sensor Contamination: Build-up of soot, oil, or other contaminants on the NOx sensor can interfere with its operation and cause the low voltage signal.
Symptoms of P116B 2018 GMC Sierra
- Check Engine Light: The most common symptom associated with the P116B code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Fuel Efficiency: A malfunctioning NOx sensor can cause the engine to run inefficiently, leading to decreased fuel economy.
- Rough Idle: The engine may experience rough idling or hesitation when the NOx sensor is not functioning correctly.
- Emission Test Failure: If the NOx sensor is not working properly, the vehicle may fail emissions tests due to increased nitrogen oxide emissions.
How to Fix P116B 2018 GMC Sierra
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform tests to pinpoint the exact cause of the low voltage signal from the NOx sensor.
- Inspect Wiring and Connections: Check the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as necessary.
- Test NOx Sensor: Test the NOx sensor using a multimeter to ensure it is functioning correctly. Replace the sensor if it is faulty.
- Clear Codes: After making the necessary repairs, clear the DTCs from the ECM memory and reset the check engine light.
- Perform Road Test: Take the vehicle for a test drive to verify that the issue has been resolved and that the check engine light does not reappear.
Cost to Fix P116B 2018 GMC Sierra
The cost of repairing the P116B code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of replacing a NOx sensor ranges from $200 to $500, including parts and labor. Additional costs may apply if wiring repairs or ECM diagnostics are needed. It's advisable to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your vehicle's condition and location. Keep in mind that labor rates can range from $80 to $150 per hour, so the total cost may vary accordingly.
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Frequently Asked Questions about P116B 2018 GMC Sierra Code
What does the OBDII code P116B mean on a 2018 GMC Sierra?
P116B indicates an issue with the O2 signal circuit of NOx Sensor 1, where the voltage is lower than expected, potentially affecting emissions control.
What are the common symptoms of code P116B on a 2018 GMC Sierra?
Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, or increased exhaust emissions.
What causes the P116B code in a 2018 GMC Sierra?
Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, a malfunctioning ECM, or excessive soot buildup on the sensor.
Can I drive my 2018 GMC Sierra with code P116B active?
While the vehicle may still drive, it's not recommended as the issue can lead to increased emissions, reduced fuel economy, and potential damage to the catalytic converter over time.
How is the P116B code diagnosed on a 2018 GMC Sierra?
A technician will use a scan tool to read live data, check for wiring or connector issues, inspect the NOx sensor, and test the O2 signal circuit for proper voltage levels.
How do you fix the P116B code on a 2018 GMC Sierra?
Repairs may involve replacing the NOx sensor, repairing or replacing damaged wiring or connectors, cleaning the sensor if it’s clogged, or reprogramming/updating the ECM if needed.
How much does it cost to repair the P116B code on a 2018 GMC Sierra?
Repair costs can range from $200 to $700 or more, depending on whether the NOx sensor, wiring, or ECM requires replacement or reprogramming.
Can a faulty NOx sensor cause other problems in a 2018 GMC Sierra?
Yes, a faulty NOx sensor can lead to poor fuel economy, increased emissions, and potential damage to the catalytic converter if left unresolved.
What tools are needed to troubleshoot the P116B code on a 2018 GMC Sierra?
Common tools include an OBDII scan tool, a multimeter for testing circuits, and possibly specialized tools for removing and replacing the NOx sensor.
Is code P116B covered under warranty for a 2018 GMC Sierra?
It depends on the vehicle’s warranty terms. Emissions-related components like the NOx sensor may be covered under the federally mandated emissions warranty.
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