P116B 2016 GMC Sierra Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)
Quick Answer
The P116B diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the O2 signal circuit low voltage related to the NOx (nitrogen oxide) sensor 1. Common causes include Faulty NOx sensor 1, Wiring or connector issues in the O2 signal circuit, ECM software or hardware malfunction. 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 2016 GMC Sierra indicates O2 Signal Circuit Low Voltage (NOx Sensor 1).
- Common causes
- Common causes include Faulty NOx sensor 1, Wiring or connector issues in the O2 signal circuit, ECM software or hardware malfunction.
- 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 2016 GMC Sierra Description
The P116B diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates an issue with the O2 signal circuit low voltage related to the NOx (nitrogen oxide) sensor 1. The NOx sensor is a crucial component in the vehicle's emissions control system, responsible for monitoring and regulating the levels of nitrogen oxides in the exhaust gases. When the O2 signal circuit detects a low voltage from the NOx sensor 1, it suggests that there is a problem with the sensor's ability to accurately measure and report the NOx levels. This can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter.
Common Causes of P116B 2016 GMC Sierra
- Faulty NOx sensor 1
- Wiring or connector issues in the O2 signal circuit
- ECM software or hardware malfunction
- Exhaust system leaks
- Contaminated NOx sensor
Symptoms of P116B 2016 GMC Sierra
- Decreased fuel efficiency
- Check Engine Light illuminated
- Rough idling or stalling
- Reduced engine power
- Failed emissions test
How to Fix P116B 2016 GMC Sierra
- Begin by conducting a thorough inspection of the NOx sensor 1, wiring, and connectors for any visible damage or corrosion.
- Test the NOx sensor 1 using a multimeter to check for proper voltage output.
- If the sensor is faulty, replace it with a new, OEM-quality sensor.
- Check and repair any damaged wiring or connectors in the O2 signal circuit.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix P116B 2016 GMC Sierra
The typical repair costs for addressing a P116B code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. Replacement NOx sensors can range from $150 to $300, while labor costs may add another $100 to $200. Overall, the total repair cost could fall between $250 and $500. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources to get a more accurate estimate.
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Frequently Asked Questions about P116B 2016 GMC Sierra Code
1. What does the OBDII code P116B mean on a 2016 GMC Sierra?
The P116B code indicates a low voltage issue in the oxygen sensor signal circuit for NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.
2. What are the symptoms of code P116B in a 2016 GMC Sierra?
Common symptoms include reduced engine performance, decreased fuel efficiency, an illuminated check engine light, and possible rough idling.
3. What causes the P116B code to appear on a GMC Sierra?
Potential causes include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, exhaust leaks, or an issue with the vehicle's PCM.
4. Can I drive my 2016 GMC Sierra with the P116B code?
While the vehicle may still operate, driving with this code can lead to worsened fuel efficiency and potential damage to the emissions system. It’s best to address the issue promptly.
5. How do I diagnose the P116B code on my GMC Sierra?
Start by checking the wiring and connectors to the NOx sensor for damage or corrosion. Use a scan tool to monitor sensor data and verify the low voltage reading.
6. How do I fix the P116B code on a 2016 GMC Sierra?
Repairs may include replacing the NOx sensor, repairing damaged wiring or connectors, or addressing any exhaust leaks affecting sensor readings.
7. How much does it cost to repair a P116B code on a GMC Sierra?
Repair costs can vary but typically range from $200 to $600, depending on whether the NOx sensor needs replacement or if wiring repairs are required.
8. What tools do I need to fix the P116B code?
You’ll need an OBDII scanner, a multimeter to check voltages, and basic hand tools for inspecting and replacing components.
9. Can a faulty PCM cause the P116B code on a GMC Sierra?
While rare, a malfunctioning Powertrain Control Module (PCM) can cause this code. It’s usually a last resort after ruling out sensor and wiring issues.
10. How often do NOx sensors fail in the 2016 GMC Sierra?
NOx sensors generally last 80,000–100,000 miles, but failure can occur earlier due to contamination, damage, or extreme operating conditions.
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