P1160 2018 Chevrolet Silverado Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)
Quick Answer
The P1160 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the O2 reference voltage circuit being too high in voltage, specifically related to the NOx sensor 1. Common causes include Faulty O2 Sensor: A malfunctioning O2 sensor can cause the O2 reference voltage circuit to read high voltage, Damaged Wiring or Connectors: Corrosion, fraying, or damage to the wiring or connectors in the O2 reference voltage circuit can lead to high voltage readings, Malfunctioning ECM: A faulty engine control module (ECM) can send incorrect signals to the O2 reference voltage circuit, causing high voltage readings. 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
- P1160 2018 Chevrolet Silverado indicates O2 Reference Voltage Circuit High Voltage (NOx Sensor 1).
- Common causes
- Common causes include Faulty O2 Sensor: A malfunctioning O2 sensor can cause the O2 reference voltage circuit to read high voltage, Damaged Wiring or Connectors: Corrosion, fraying, or damage to the wiring or connectors in the O2 reference voltage circuit can lead to high voltage readings, Malfunctioning ECM: A faulty engine control module (ECM) can send incorrect signals to the O2 reference voltage circuit, causing high voltage readings.
- 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 P1160 2018 Chevrolet Silverado Description
The P1160 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado indicates an issue with the O2 reference voltage circuit being too high in voltage, specifically 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. The O2 reference voltage circuit provides a stable voltage reference for the NOx sensor to accurately measure the levels of NOx in the exhaust.
Common Causes of P1160 2018 Chevrolet Silverado
- Faulty O2 Sensor: A malfunctioning O2 sensor can cause the O2 reference voltage circuit to read high voltage.
- Damaged Wiring or Connectors: Corrosion, fraying, or damage to the wiring or connectors in the O2 reference voltage circuit can lead to high voltage readings.
- Malfunctioning ECM: A faulty engine control module (ECM) can send incorrect signals to the O2 reference voltage circuit, causing high voltage readings.
- Power Supply Issues: Problems with the power supply to the O2 sensor, such as a blown fuse or a weak battery, can result in high voltage in the O2 reference voltage circuit.
Symptoms of P1160 2018 Chevrolet Silverado
- Check Engine Light: The most common symptom associated with the P1160 code is the illumination of the check engine light on the vehicle's dashboard.
- Decreased Fuel Efficiency: A high voltage in the O2 reference voltage circuit can lead to incorrect fuel mixture adjustments, resulting in decreased fuel efficiency.
- Rough Idling: The engine may experience rough idling or hesitation when the O2 reference voltage circuit is not functioning correctly.
- Increased Emissions: The vehicle may produce higher emissions than usual due to inaccurate readings from the NOx sensor.
- Engine Misfires: In severe cases, the engine may experience misfires or lack of power due to the incorrect air-fuel mixture caused by the high voltage in the O2 reference voltage circuit.
How to Fix P1160 2018 Chevrolet Silverado
- Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the O2 sensor, wiring, connectors, and ECM to identify the root cause of the high voltage in the O2 reference voltage circuit.
- Replace O2 Sensor: If the O2 sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate readings in the O2 reference voltage circuit.
- Repair Wiring or Connectors: Repair or replace any damaged wiring or connectors in the O2 reference voltage circuit to restore proper voltage levels.
- Check ECM Functionality: Test the ECM for proper functionality and replace it if necessary to prevent further issues with the O2 reference voltage circuit.
- Clear DTCs and Test Drive: After completing the repairs, clear the DTCs from the ECM memory, and test drive the vehicle to ensure that the issue has been resolved and that the check engine light does not reappear.
Cost to Fix P1160 2018 Chevrolet Silverado
The typical repair costs for addressing a P1160 code on a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue. Replacement O2 sensors can range from $50 to $200, while labor costs for diagnosis and repair can range from $100 to $300. Overall, the total repair cost for this issue may fall between $150 and $500, including parts and labor. It is important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate.
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