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P2202 GMC Code - NOx Sensor 1 Circuit Low Voltage

Quick Answer

The P2202 GMC code indicates that there is a low voltage condition detected in the NOx (Nitrogen Oxide) sensor 1 circuit. Common causes include Faulty NOx sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P2202 GMC indicates NOx Sensor 1 Circuit Low Voltage.
Common causes
Common causes include Faulty NOx sensor, Damaged wiring or connectors in the sensor circuit, ECM malfunction.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P2202 GMC Description

The P2202 GMC code indicates that there is a low voltage condition detected in the NOx (Nitrogen Oxide) sensor 1 circuit. The NOx sensor is crucial for monitoring and controlling the levels of nitrogen oxide emissions in the vehicle's exhaust system. It plays a vital role in ensuring compliance with emissions regulations and optimizing the vehicle's fuel efficiency.

OBDII Code P2202 GMC - NOx Sensor 1 Circuit Low Voltage
P2202 GMC Code - NOx Sensor 1 Circuit Low Voltage

Common Causes of P2202 GMC

  1. Faulty NOx sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. ECM malfunction
  4. Exhaust leaks
  5. Contaminated diesel exhaust fluid (DEF)

Symptoms of P2202 GMC

  1. Check engine light illuminated
  2. Decreased fuel efficiency
  3. Poor engine performance
  4. Failed emissions test
  5. Rough idling or hesitation during acceleration

How to Fix P2202 GMC

  1. Begin by using a diagnostic scanner to retrieve the fault code and data related to the NOx sensor 1 circuit.
  2. Inspect the wiring and connectors for any signs of damage or corrosion. Repair or replace any faulty components.
  3. Test the NOx sensor's operation using a multimeter to ensure it is functioning within the manufacturer's specifications. Replace the sensor if necessary.
  4. Clear the fault code from the vehicle's ECM using the diagnostic scanner and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to identify any underlying issues with the emissions control system.

Cost to Fix P2202 GMC

The typical repair costs for addressing a P2202 GMC code related to the NOx sensor 1 circuit low voltage can range from $200 to $500, including parts and labor. However, specific costs may vary depending on the vehicle make and model, the location of the repair shop, and the extent of the repairs needed. It is recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the individual circumstances. Keep in mind that diagnostic time and labor rates can influence the final cost of the repair process.

What does this mean?

Tech Notes for P2202 GMC

There is a Factory Service Bulletin for the following GMC models:
2010 GMC Savana
2011 GMC Savana
2011 GMC Sierra
GMC Factory Service Bulletin OBDII Code P2202

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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 P2202 GMC Code

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  • 2012 GMC 2500HD Duramax, it threw out P2202 after it stalled when I did a remote start on a cold (-3'F) morning. Text on the dash states that it will limit power in 175 miles. Two days later checked codes again and now it was showing two codes P2200 &P2202. I had been doing a lot of slow driving and using the remote start alot before this happened. Thinking that it's just particular matter built up. So I started driving harder - high speeds, fast acceleration, etc. The Check Engine light went out. It seems to be back to normal now except for the text telling me that it will limit power in 142 miles... The DEF fluid was "normal" before all this happened....I don't suspect anything there. I'll take it in to the shop to get the text cleared and find out more. If I can find my way back here, I'll update this.

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