P116B 2018 Chevrolet Silverado Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)
Quick Answer
The P116B diagnostic trouble code (DTC) on a 2018 Chevrolet Silverado indicates a problem with the O2 signal circuit low voltage related to the NOx sensor 1. Common causes include Faulty NOx sensor, Damaged wiring or connectors in the O2 signal circuit, Malfunctioning engine control module (ECM). 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 Chevrolet Silverado indicates O2 Signal Circuit Low Voltage (NOx Sensor 1).
- Common causes
- Common causes include Faulty NOx sensor, Damaged wiring or connectors in the O2 signal circuit, Malfunctioning engine control module (ECM).
- 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 Chevrolet Silverado Description
The P116B diagnostic trouble code (DTC) on a 2018 Chevrolet Silverado indicates a problem with the O2 signal circuit low voltage related to the NOx sensor 1. The NOx sensor is responsible for monitoring the levels of nitrogen oxide emissions in the exhaust gases. When the O2 signal circuit voltage drops below the specified threshold, it can lead to issues with the NOx sensor's ability to accurately measure emissions levels, potentially causing the vehicle to run inefficiently and produce higher emissions.
Common Causes of P116B 2018 Chevrolet Silverado
- Faulty NOx sensor
- Damaged wiring or connectors in the O2 signal circuit
- Malfunctioning engine control module (ECM)
- Exhaust system leaks
- Poor quality fuel
Symptoms of P116B 2018 Chevrolet Silverado
- Reduced fuel efficiency
- Engine misfires or hesitation
- Illumination of the check engine light
- Failed emissions test
- Rough idling or stalling
How to Fix P116B 2018 Chevrolet Silverado
- Use a diagnostic scanner to read and record the DTCs, including P116B.
- Inspect the NOx sensor and O2 signal circuit wiring for damage or corrosion.
- Test the NOx sensor's voltage output and replace if necessary.
- Check and repair any leaks in the exhaust system.
- Clear the DTC and conduct a road test to ensure the issue has been resolved.
Cost to Fix P116B 2018 Chevrolet Silverado
The cost of repairing a P116B code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. In general, replacing a faulty NOx sensor can cost between $200 and $500, while repairing damaged wiring or connectors may range from $100 to $300. If the problem is related to the ECM, costs can escalate significantly, potentially exceeding $1,000 including parts and labor.
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Frequently Asked Questions about P116B 2018 Chevrolet Silverado Code
What does the OBDII code P116B mean for a 2018 Chevrolet Silverado?
The P116B code indicates a low voltage issue in the O2 signal circuit of NOx Sensor 1, which monitors nitrogen oxide emissions.
What are the symptoms of the P116B code in a 2018 Chevrolet Silverado?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and possibly a failed emissions test.
What causes the P116B code to appear in a 2018 Chevrolet Silverado?
Causes may include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, or issues with the vehicle’s ECM.
Can I drive my 2018 Chevrolet Silverado with the P116B code?
While the vehicle may still be drivable, it’s not recommended as it could lead to reduced performance, higher emissions, or potential damage to other components.
How do I diagnose the P116B code on a 2018 Chevrolet Silverado?
Start by using an OBDII scanner to confirm the code, then inspect the NOx sensor, wiring, and connectors for damage or corrosion, and test the sensor's voltage output.
How is the P116B code fixed in a 2018 Chevrolet Silverado?
Repairs may involve replacing a faulty NOx sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if needed.
How much does it cost to repair the P116B code on a 2018 Chevrolet Silverado?
Repair costs can range from $200 to $800, depending on whether the NOx sensor, wiring, or ECM needs to be repaired or replaced.
Can a dirty or clogged exhaust system cause the P116B code?
Yes, a clogged exhaust system can affect sensor readings and potentially trigger the P116B code, though it is less common.
Does the P116B code affect fuel economy in a 2018 Chevrolet Silverado?
Yes, a malfunctioning NOx sensor can cause the engine to run inefficiently, leading to reduced fuel economy.
Should the NOx sensor be replaced immediately if the P116B code is present?
Not necessarily; the sensor should be tested to confirm it’s faulty before replacement, as the issue could also stem from wiring or the ECM.
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