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P20E2 GMC Code - Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1

Quick Answer

The P20E2 diagnostic trouble code (DTC) for GMC vehicles indicates a correlation issue between Exhaust Gas Temperature (EGT) Sensor 1 and EGT Sensor 2 in Bank 1. Common causes include Faulty EGT sensors, Wiring issues or shorts, ECM malfunction. 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
P20E2 GMC indicates Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1.
Common causes
Common causes include Faulty EGT sensors, Wiring issues or shorts, ECM malfunction.
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 Aug 30, 2024
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Code P20E2 GMC Description

The P20E2 diagnostic trouble code (DTC) for GMC vehicles indicates a correlation issue between Exhaust Gas Temperature (EGT) Sensor 1 and EGT Sensor 2 in Bank 1. These sensors are responsible for monitoring the temperature of exhaust gases leaving the engine. When the correlation between the two sensors is off, it can lead to incorrect readings being sent to the engine control module (ECM), impacting the vehicle's performance and emissions control.

OBDII Code P20E2 GMC - Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1
P20E2 GMC Code - Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1

Common Causes of P20E2 GMC

  1. Faulty EGT sensors
  2. Wiring issues or shorts
  3. ECM malfunction
  4. Exhaust system leaks
  5. Incorrect sensor placement or installation

Symptoms of P20E2 GMC

  1. Reduced fuel efficiency
  2. Engine power loss
  3. Check engine light illuminated
  4. Potential misfires
  5. Rough idling

How to Fix P20E2 GMC

  1. Diagnose the issue using a scan tool to verify the correlation problem between EGT Sensor 1 and EGT Sensor 2.
  2. Inspect the wiring connected to the EGT sensors for any damage or shorts.
  3. Test the EGT sensors for proper functionality and replace any faulty sensors.
  4. Clear the DTC and reset the ECM to see if the code returns after repairs.
  5. Perform a road test to ensure that the issue has been resolved and that the sensors are now correlating correctly.

Cost to Fix P20E2 GMC

The typical repair costs for addressing a P20E2 code can range from $200 to $500, including parts and labor. However, it is essential to note that 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 recommended to check with local auto repair shops for a more accurate estimate based on your specific circumstances.

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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.

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