P116C 2018 GMC Sierra Code - O2 Signal Circuit High Voltage (NOx Sensor 1)
Quick Answer
The P116C diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the O2 signal circuit high voltage related to the NOx sensor 1. Common causes include Faulty NOx sensor, Wiring or connector issues in the O2 signal circuit, Exhaust leaks near the sensor. 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
- P116C 2018 GMC Sierra indicates O2 Signal Circuit High Voltage (NOx Sensor 1).
- Common causes
- Common causes include Faulty NOx sensor, Wiring or connector issues in the O2 signal circuit, Exhaust leaks near the sensor.
- 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 P116C 2018 GMC Sierra Description
The P116C diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the O2 signal circuit high voltage related to the NOx sensor 1. The NOx sensor is responsible for monitoring the levels of nitrogen oxide in the exhaust gases of the vehicle. When the O2 signal circuit shows high voltage, it means that the sensor is detecting an excessive amount of oxygen in the exhaust stream, which can lead to incorrect fuel mixture and emissions readings.
Common Causes of P116C 2018 GMC Sierra
- Faulty NOx sensor
- Wiring or connector issues in the O2 signal circuit
- Exhaust leaks near the sensor
- Engine running too rich
- ECM software issues
Symptoms of P116C 2018 GMC Sierra
- Decreased fuel efficiency
- Engine misfires or rough idling
- Check Engine Light illuminated
- Failed emissions test
- Reduced engine performance
How to Fix P116C 2018 GMC Sierra
- Begin by diagnosing the specific cause of the high voltage signal, such as testing the NOx sensor and checking the wiring for any damage or corrosion.
- Replace the NOx sensor if it is found to be faulty.
- Repair or replace any damaged wiring or connectors in the O2 signal circuit.
- Check for and repair any exhaust leaks near the sensor.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix P116C 2018 GMC Sierra
The cost of repairing a P116C DTC on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. Typically, replacing a NOx sensor can cost between $200 and $500, while addressing wiring or connector issues may range from $100 to $300. Overall, you can expect the total repair cost to be between $300 and $800, including parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a few quotes to determine the most accurate estimate for your specific situation.
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Frequently Asked Questions about P116C 2018 GMC Sierra Code
What does the OBDII code P116C mean on a 2018 GMC Sierra?
Code P116C indicates a high voltage issue in the oxygen (O2) signal circuit of the NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.
What are common symptoms of P116C on a 2018 GMC Sierra?
Symptoms may include the check engine light turning on, reduced fuel efficiency, rough idling, poor engine performance, or the vehicle entering limp mode.
What causes the P116C code to appear?
Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, excessive carbon buildup on the sensor, or an issue with the ECM.
Can a faulty NOx sensor trigger the P116C code?
Yes, a malfunctioning NOx sensor is one of the primary causes of the P116C code, as it may send incorrect voltage signals to the ECM.
How can I diagnose the P116C code?
Start by inspecting the wiring and connectors for damage or corrosion, checking the NOx sensor for proper function, and using a scan tool to monitor the sensor's voltage readings.
Is it safe to drive with the P116C code?
Driving with this code is not recommended, as it can lead to reduced performance, increased emissions, and possible long-term damage to the engine or exhaust system.
How do I fix the P116C code on my 2018 GMC Sierra?
Possible fixes include repairing or replacing damaged wiring, cleaning or replacing the NOx sensor, updating the ECM software, or replacing the ECM if necessary.
How much does it cost to repair a P116C code?
Depending on the issue, repairs could range from $100 for wiring fixes to $500 or more for replacing the NOx sensor or ECM.
Can a software update fix the P116C code?
In some cases, an ECM software update may resolve the issue if the problem is related to incorrect programming rather than a hardware failure.
What tools are needed to troubleshoot the P116C code?
A scan tool with OBDII capabilities, a multimeter for checking voltage, and basic hand tools for inspecting or replacing components are typically required.
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