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Engine-Codes – GMC – P0136 GMC

P0136 GMC Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

Quick Answer

The P0136 GMC code indicates a Heated Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2. Common causes include Faulty oxygen sensor, Wiring issues (shorts, frayed wires), Exhaust leaks near the sensor. 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
P0136 GMC indicates Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2.
Common causes
Common causes include Faulty oxygen sensor, Wiring issues (shorts, frayed wires), Exhaust leaks near the sensor.
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 12, 2024
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Code P0136 GMC Description

The P0136 GMC code indicates a Heated Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2. This means that there is a problem with the oxygen sensor located downstream of the catalytic converter on the side of the engine that contains cylinder 1. The oxygen sensor is responsible for monitoring the oxygen levels in the exhaust gases and sending this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion.

OBDII Code P0136 GMC - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 GMC Code - Heated Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

Common Causes of P0136 GMC

  1. Faulty oxygen sensor
  2. Wiring issues (shorts, frayed wires)
  3. Exhaust leaks near the sensor
  4. ECM malfunction
  5. Contaminated sensor (e.g., from oil or coolant leaks)

Symptoms of P0136 GMC

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Failed emissions test
  5. Engine hesitation

How to Fix P0136 GMC

  1. Diagnose the issue using a scan tool to confirm the P0136 code and pinpoint the exact cause of the malfunction.
  2. Inspect the wiring harness for any damage or corrosion and repair or replace as necessary.
  3. Check for exhaust leaks near the sensor and repair them to prevent contamination.
  4. Replace the Bank 1 Sensor 2 oxygen sensor with a new, OEM-quality part.
  5. Clear the fault codes and perform a test drive to ensure the issue has been resolved.

Cost to Fix P0136 GMC

The typical repair costs for a Heated Oxygen Sensor Circuit Malfunction (P0136) can range from $200 to $500, including parts and labor. However, prices may vary depending on the vehicle make and model, the location of the repair shop, and the specific diagnostic time and labor rates. It is advisable to obtain quotes from multiple auto repair shops to get a more accurate estimate for your specific situation.

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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.

Frequently Asked Questions about P0136 GMC Code

1. What does the OBDII code P0136 GMC indicate?

The code P0136 GMC indicates a Heated Oxygen Sensor Circuit Malfunction for Bank 1 Sensor 2.

2. What are the common symptoms of a P0136 error code?

Common symptoms of a P0136 error code include poor fuel economy, rough idling, engine misfires, and a check engine light on the dashboard.

3. What are the possible causes of a P0136 error code?

Possible causes of a P0136 error code include a faulty oxygen sensor, damaged wiring or connectors, issues with the engine's computer, or exhaust system leaks.

4. How can I diagnose a P0136 error code?

Diagnosing a P0136 error code typically involves using a scan tool to retrieve the code, inspecting the oxygen sensor and its connections, and checking for any exhaust system leaks.

5. How can I repair a P0136 error code?

Repairing a P0136 error code may involve replacing the Bank 1 Sensor 2 oxygen sensor, repairing damaged wiring or connectors, or addressing any exhaust system leaks.

6. Can I drive my vehicle with a P0136 error code?

It is not recommended to drive your vehicle with a P0136 error code, as it can lead to further engine damage and decreased fuel efficiency.

7. How much does it cost to fix a P0136 error code?

The cost to fix a P0136 error code can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

8. How often should the oxygen sensor be replaced to prevent P0136 errors?

It is recommended to replace the oxygen sensor every 60,000 to 90,000 miles to prevent issues like the P0136 error code.

9. Will disconnecting the battery reset a P0136 error code?

Disconnecting the battery may temporarily reset the error code, but it is not a guaranteed fix. It is best to diagnose and repair the underlying issue causing the P0136 error code.

10. Are there any DIY tips for troubleshooting a P0136 error code?

DIY tips for troubleshooting a P0136 error code include checking the oxygen sensor connections, inspecting the wiring for damage, and ensuring there are no exhaust leaks near the sensor.

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