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Engine-Codes – GMC – P1160 GMC

P1160 GMC Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)

Quick Answer

The P1160 GMC diagnostic trouble code (DTC) refers to the O2 reference voltage circuit high voltage related to the NOx Sensor 1. Common causes include Wiring Issues: Damaged or corroded wiring in the O2 reference voltage circuit can cause high voltage readings, Faulty NOx Sensor: A malfunctioning NOx sensor can also trigger the high voltage in the O2 reference circuit, ECM Malfunction: A problem with the engine control module (ECM) can result in incorrect voltage readings in the O2 reference circuit. 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 GMC indicates O2 Reference Voltage Circuit High Voltage (NOx Sensor 1).
Common causes
Common causes include Wiring Issues: Damaged or corroded wiring in the O2 reference voltage circuit can cause high voltage readings, Faulty NOx Sensor: A malfunctioning NOx sensor can also trigger the high voltage in the O2 reference circuit, ECM Malfunction: A problem with the engine control module (ECM) can result in incorrect voltage readings in the O2 reference circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1160 GMC Description

The P1160 GMC diagnostic trouble code (DTC) refers to the O2 reference voltage circuit high voltage related to the NOx Sensor 1. This code indicates that the oxygen sensor voltage in the NOx Sensor 1 circuit is higher than normal, potentially causing issues with the vehicle's emissions control system. The NOx sensor is responsible for monitoring the levels of nitrogen oxide in the exhaust gases and ensuring the vehicle meets emissions standards.

OBDII Code P1160 GMC - O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)
P1160 GMC Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)

Common Causes of P1160 GMC

  1. Wiring Issues: Damaged or corroded wiring in the O2 reference voltage circuit can cause high voltage readings.
  2. Faulty NOx Sensor: A malfunctioning NOx sensor can also trigger the high voltage in the O2 reference circuit.
  3. ECM Malfunction: A problem with the engine control module (ECM) can result in incorrect voltage readings in the O2 reference circuit.
  4. Power Supply Problem: Issues with the power supply to the sensor can lead to high voltage levels in the O2 reference circuit.

Symptoms of P1160 GMC

  1. 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.
  2. Reduced Fuel Efficiency: High voltage in the O2 reference circuit can lead to improper fuel mixture, resulting in reduced fuel efficiency.
  3. Poor Engine Performance: The vehicle may experience rough idling, hesitation, or a lack of power due to the incorrect fuel mixture.
  4. Failed Emissions Test: If the issue is not resolved, the vehicle may fail emissions tests due to increased emissions levels.

How to Fix P1160 GMC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform further testing to identify the root cause of the high voltage in the O2 reference circuit.
  2. Check Wiring: Inspect the wiring in the O2 reference voltage circuit for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test NOx Sensor: Test the NOx sensor to determine if it is functioning properly. Replace the sensor if it is found to be faulty.
  4. Inspect ECM: Check the engine control module for any signs of malfunction. Repair or replace the ECM if necessary.
  5. Clear Codes: After completing the repairs, clear the trouble codes and reset the check engine light to ensure the issue has been resolved.

Cost to Fix P1160 GMC

The typical repair costs for addressing the P1160 GMC code can vary depending on the specific cause of the issue. In general, the cost of parts such as a new NOx sensor, wiring repairs, or an ECM replacement can range from $200 to $600. Labor costs at an auto repair shop can add an additional $100 to $300 to the total repair bill. Keep in mind that diagnostic time and labor rates may vary based on the location, vehicle make and model, and engine type. It's recommended to check with local auto repair shops for a more accurate cost estimate.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1160 GMC Code

1. What are the common symptoms of OBDII code P1160 in a GMC related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential issues with the exhaust system.

2. What are the typical causes of OBDII code P1160 GMC related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)?

- Potential causes may include a faulty NOx sensor, damaged wiring or connectors in the O2 sensor circuit, issues with the powertrain control module (PCM), or a malfunctioning sensor heater.

3. How can I diagnose OBDII code P1160 GMC related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)?

- Diagnosis typically involves using a scan tool to retrieve the error code, checking the NOx sensor for proper operation, inspecting the wiring and connectors for damage, and testing the sensor heater circuit.

4. Can I continue driving with OBDII code P1160 related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1) without immediate repair?

- It is not recommended to continue driving with this code unresolved, as it can lead to poor engine performance, increased emissions, and potential damage to other components.

5. How can I repair OBDII code P1160 GMC related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)?

- Repairs may involve replacing the NOx sensor, repairing or replacing damaged wiring or connectors, addressing issues with the PCM, or fixing any problems with the sensor heater.

6. Are there any DIY tips for addressing OBDII code P1160 related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)?

- DIY tips may include checking the sensor connections for tightness, inspecting the sensor for physical damage, and ensuring the wiring is not corroded or frayed.

7. How critical is it to address OBDII code P1160 GMC related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1) promptly?

- It is important to address this code promptly to prevent potential damage to other engine components, ensure optimal fuel efficiency, and reduce harmful emissions.

8. Can a faulty NOx sensor cause OBDII code P1160 GMC related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1)?

- Yes, a faulty NOx sensor can trigger this code due to issues with the O2 reference voltage circuit and high voltage readings.

9. What role does the NOx sensor play in the O2 reference voltage circuit, leading to OBDII code P1160 GMC?

- The NOx sensor measures the level of nitrogen oxide in the exhaust and provides feedback to the PCM, which can affect the O2 reference voltage circuit and trigger the high voltage fault.

10. How can a professional mechanic help in diagnosing and repairing OBDII code P1160 related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 1) in a GMC?

- A professional mechanic has the tools, expertise, and experience to accurately diagnose the issue, perform necessary repairs or replacements, and ensure the problem is resolved effectively to prevent further issues.

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