AutoCodes – GMC – P0135 2014 GMC Sierra

P0135 2014 GMC Sierra Code - HO2S Heater Performance Bank 1 Sensor 1

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. 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: P0135 2014 GMC Sierra indicates HO2S Heater Performance Bank 1 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
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.

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Code Popularity 343

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0135 2014 GMC Sierra Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 heater current is out of factory specifications.

OBDII Code P0135 2014 GMC Sierra - HO2S Heater Performance Bank 1 Sensor 1 - AutoCodes.com — P0135 2014 GMC Sierra Code - HO2S Heater Performance Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0135 2014 GMC Sierra?

Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted
Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
Heated Oxygen Sensor Bank 1 Sensor 1 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0135 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0135 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P0135 2014 GMC Sierra Code

1. What does the OBDII code P0135 for a 2014 GMC Sierra mean?

The code P0135 indicates a malfunction in the HO2S (Heated Oxygen Sensor) heater circuit for Bank 1 Sensor 1, which is usually the front oxygen sensor on the exhaust manifold.

2. What are the common symptoms of a P0135 code in a 2014 GMC Sierra?

Common symptoms of a P0135 code include poor fuel economy, rough idle, engine misfires, and the illumination of the check engine light on the dashboard.

3. What are the possible causes of a P0135 code on a 2014 GMC Sierra?

Potential causes of a P0135 code include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or a problem with the engine control module (ECM).

4. How can I diagnose a P0135 code in my 2014 GMC Sierra?

Diagnosing a P0135 code involves checking the oxygen sensor's wiring and connectors for damage, testing the heater circuit for continuity, and verifying proper voltage supply to the sensor.

5. Can I drive my 2014 GMC Sierra with a P0135 code?

It is not recommended to drive your vehicle with a P0135 code for an extended period as it can lead to reduced fuel efficiency and potential damage to the catalytic converter.

6. How can I repair a P0135 code on my 2014 GMC Sierra?

To repair a P0135 code, you may need to replace the Bank 1 Sensor 1 oxygen sensor, repair any damaged wiring or connectors, replace blown fuses, or reprogram the engine control module.

7. Is it possible to reset the P0135 code on a 2014 GMC Sierra without fixing the issue?

While you can clear the code using an OBDII scanner, the check engine light will likely reappear if the underlying issue causing the P0135 code is not addressed.

8. How much does it cost to fix a P0135 code on a 2014 GMC Sierra?

The cost of fixing a P0135 code can vary depending on the root cause, but it typically ranges from $100 to $300 for parts and labor, including sensor replacement and diagnostic fees.

9. Can a P0135 code on a 2014 GMC Sierra cause emissions test failure?

Yes, a P0135 code can cause your vehicle to fail emissions testing due to increased emissions and improper fuel-air mixture caused by a malfunctioning oxygen sensor heater.

10. How often does a P0135 code occur in a 2014 GMC Sierra?

P0135 codes are relatively common in vehicles with heated oxygen sensors, and they can occur due to sensor wear, electrical issues, or environmental factors affecting the sensor's performance.