What Is P0135 Code On Chevy Silverado? (How To Fix)

The P0135 code on a Chevy Silverado refers to a specific diagnostic trouble code (DTC) related to the vehicle’s oxygen sensor. The oxygen sensor, also known as the O2 sensor, is an essential component of the vehicle’s emissions control system. It measures the amount of oxygen in the exhaust gases and provides feedback to the engine control module (ECM) to ensure optimal fuel efficiency and minimize harmful emissions.

When the ECM detects a problem with the oxygen sensor’s heater circuit, it triggers the P0135 code. This code specifically points to the Bank 1 Sensor 1 oxygen sensor, which is located before the catalytic converter in the exhaust system. The heater circuit is responsible for rapidly bringing the oxygen sensor up to its operating temperature when the engine is started. If the ECM detects a fault in this circuit, it illuminates the check engine light and stores the P0135 code.

Understanding the P0135 code is crucial for Chevy Silverado owners as it indicates a potential issue with the oxygen sensor’s heater circuit. In this article, we will delve deeper into the possible causes, symptoms, and solutions for the P0135 code on a Chevy Silverado, assisting owners in diagnosing and resolving the problem effectively.

What Does P0135 Code Means On Chevy Silverado? 

The P0135 code on a Chevy Silverado indicates a malfunction in the vehicle’s oxygen sensor heater circuit for Bank 1 Sensor 1. The oxygen sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, providing feedback to the engine control module (ECM) for proper fuel delivery and emission control.

The P0135 code specifically refers to the heater circuit of the oxygen sensor. The oxygen sensor needs to reach its optimal operating temperature quickly after the engine is started. The heater circuit is responsible for heating up the oxygen sensor to ensure accurate readings and efficient operation. When the ECM detects a fault in the heater circuit, it triggers the P0135 code and illuminates the check engine light.

There are several potential causes for the P0135 code on a Chevy Silverado. It could be due to a faulty oxygen sensor, a damaged or shorted wiring harness, a blown fuse related to the heater circuit, or a problem with the ECM itself. Diagnosing the exact cause of the code requires a thorough inspection of the sensor, wiring, and associated components.

If the P0135 code appears on your Chevy Silverado, it is important to address the issue promptly. Ignoring the problem can lead to reduced fuel efficiency, increased emissions, and potential damage to other engine components. Seeking professional assistance or consulting a reliable repair manual is recommended to diagnose and fix the P0135 code accurately.

Symptoms Of Getting The P0135 Code On Chevy Silverado

When the P0135 code appears on a Chevy Silverado, several symptoms may indicate its presence. These symptoms can help vehicle owners identify and address the issue promptly. Here are some common symptoms associated with the P0135 code:

Check Engine Light

The most obvious symptom is the illumination of the check engine light on the dashboard. When the ECM detects a fault in the oxygen sensor heater circuit, it triggers the check engine light to alert the driver of a potential issue.

Decreased Fuel Efficiency

A malfunctioning oxygen sensor can disrupt the air-fuel mixture, leading to decreased fuel efficiency. You may notice a decrease in the number of miles you can drive per gallon of fuel.

Rough Idling or Stalling

A faulty oxygen sensor can cause the engine to run rich or lean, resulting in rough idling or even stalling. The engine may feel shaky, inconsistent, or have difficulty maintaining a steady idle speed.

Poor Acceleration or Performance

If the oxygen sensor is not functioning correctly, it may provide inaccurate feedback to the ECM, resulting in poor engine performance. You may experience sluggish acceleration, a lack of power, or a noticeable decrease in overall performance.

Increased Emissions

The oxygen sensor is a crucial component of the vehicle’s emissions control system. When it malfunctions, it can lead to increased emissions of harmful pollutants, potentially causing the vehicle to fail emissions tests.

The Causing Factors Of The Error Code P0135 

The P0135 code on a Chevy Silverado can be triggered by several potential factors. It is important to understand these causing factors to accurately diagnose and address the issue. Here are some common causes associated with the P0135 code:

Faulty Oxygen Sensor

A malfunctioning or failed oxygen sensor is one of the primary causes of the P0135 code. Over time, the sensor can wear out or become contaminated, leading to inaccurate readings or a complete failure.

Heater Circuit Malfunction

The P0135 code specifically relates to the oxygen sensor’s heater circuit. The heater circuit is responsible for quickly bringing the sensor up to its operating temperature. A problem in the circuit, such as a damaged or broken wire, a blown fuse, or a faulty relay, can trigger the P0135 code.

Wiring Issues

Damaged, corroded, or shorted wiring harnesses connected to the oxygen sensor can disrupt the proper functioning of the heater circuit. Frayed wires, loose connections, or exposure to heat and moisture can all contribute to wiring problems.

ECM or PCM Malfunction

In some cases, the P0135 code can be caused by a fault or malfunction in the engine control module (ECM) or powertrain control module (PCM). The ECM/PCM may not be providing the necessary voltage or signals to the oxygen sensor’s heater circuit, leading to the code.

Exhaust System Leaks

Any leaks in the exhaust system before the oxygen sensor can affect its performance and trigger the P0135 code. Leaks can introduce additional air into the exhaust stream, leading to inaccurate readings and a malfunctioning oxygen sensor.

Environmental Factors

Extreme temperatures, harsh weather conditions, or exposure to chemicals or contaminants in the exhaust can contribute to the failure of the oxygen sensor’s heater circuit and trigger the P0135 code.

How Seriousness Is Code P0135 On Chevy Silverado?

The seriousness of the P0135 code on a Chevy Silverado can vary depending on various factors. While it may not pose an immediate threat to your safety, it is still an issue that should be addressed in a timely manner. Here’s a breakdown of the seriousness of the P0135 code:

• Driveability Issues: In some cases, the P0135 code may cause driveability issues such as rough idling, stalling, or decreased performance. These symptoms can affect your overall driving experience and may lead to inconvenience or frustration while operating the vehicle.
• Reduced Fuel Efficiency: A faulty oxygen sensor can disrupt the air-fuel mixture, resulting in decreased fuel efficiency. This means you may need to refuel more frequently, leading to increased expenses over time.
• Increased Emissions: The oxygen sensor is a crucial component of the vehicle’s emissions control system. When it malfunctions, it can lead to increased emissions of pollutants. This can contribute to environmental pollution and may cause the vehicle to fail emissions tests.
• Potential Damage to Other Components: Ignoring the P0135 code or failing to address the underlying issue can potentially cause damage to other engine components. A malfunctioning oxygen sensor can affect the engine’s performance and put additional stress on other parts of the system, leading to further problems if left unattended.
• Risk of Further Codes or Issues: A malfunctioning oxygen sensor can sometimes trigger other codes or issues if not resolved. This can complicate the diagnostic process and increase the repair costs.

How To Solve P0135 Error Code On Chevy Silverado?

To solve the P0135 error code on a Chevy Silverado, several steps can be taken. Here is a general guideline for addressing this issue:

• Diagnose the Issue: Start by using an OBD-II scanner to retrieve the specific trouble code and ensure it is P0135. This helps confirm that the oxygen sensor heater circuit is indeed the problem. It is recommended to consult a professional mechanic or refer to a reliable repair manual for accurate diagnosis.
• Inspect Wiring and Connections: Check the wiring harness connected to the oxygen sensor for any signs of damage, such as frayed wires, corrosion, or loose connections. Repair or replace any faulty wiring as necessary.
• Check the Fuse and Relay: Inspect the fuse and relay related to the oxygen sensor heater circuit. A blown fuse or a faulty relay can cause the P0135 code. Replace any damaged fuses or relays found.
• Test the Oxygen Sensor: The oxygen sensor itself may be faulty and require replacement. Using a multimeter, measure the resistance of the oxygen sensor’s heater circuit to determine if it falls within the manufacturer’s specifications. If the readings are outside the acceptable range, replace the oxygen sensor.
• Clear the Error Code: After addressing the underlying issue, use the OBD-II scanner to clear the error code from the vehicle’s ECM. This will turn off the check engine light. If the issue has been resolved successfully, the code should not reappear.
• Verify Repairs: Take the vehicle for a test drive to ensure that the P0135 code does not reappear and that the vehicle is running smoothly without any driveability issues. Monitor the performance and fuel efficiency to confirm that the problem has been resolved.

How Much Does It Cost To Solve The Error Code P0135? 

The cost to solve the P0135 error code on a Chevy Silverado can vary depending on several factors, including the specific cause of the issue, the location where the repairs are being performed, and the labor rates of the repair shop. Here are some cost considerations:

• Diagnostic Fee: If you take your vehicle to a professional mechanic, they may charge a diagnostic fee to identify the underlying cause of the P0135 code. Diagnostic fees typically range from $50 to $150, but this can vary.
• Oxygen Sensor Replacement: If the oxygen sensor itself is faulty and needs replacement, the cost will depend on the type of sensor (original equipment manufacturer or aftermarket), the brand, and the specific location of the sensor. Oxygen sensors can range in price from $50 to $200 or more.
• Wiring Repair: If the issue is related to damaged wiring or connectors, the cost will depend on the extent of the damage and the time required for repairs. The cost may include labor charges and the cost of any necessary replacement wiring or connectors.
• Fuse or Relay Replacement: If a blown fuse or faulty relay is the cause of the P0135 code, the cost will primarily involve the price of the replacement fuse or relay, which is generally inexpensive.
• Labor Costs: Labor costs can vary depending on the repair shop’s hourly rate and the complexity of the repair. Labor rates can range from $80 to $150 per hour or more. The time required to solve the P0135 code can vary depending on the specific cause and the accessibility of the components.

Common Mistakes While Solving The P0135 Code

While addressing the P0135 code on a Chevy Silverado, it’s important to be aware of common mistakes that can occur during the troubleshooting and repair process. Avoiding these mistakes can help ensure an accurate and effective resolution. Here are some common mistakes to watch out for:

• Neglecting to Verify the Code: It’s crucial to verify that the P0135 code is indeed present and related to the oxygen sensor heater circuit. Failing to do so may lead to unnecessary repairs or overlooking other underlying issues.
• Skipping the Diagnostic Process: Some individuals may jump straight into replacing the oxygen sensor without performing a thorough diagnostic process. It’s important to diagnose the exact cause of the P0135 code to avoid unnecessary part replacements and potential wasted expenses.
• Overlooking Wiring and Connectors: Wiring issues are a common cause of the P0135 code. Failing to inspect the wiring harness and connectors for damage or loose connections may result in overlooking the actual source of the problem.
• Using Low-Quality or Improperly-Specified Parts: When replacing components, it’s important to use high-quality parts that meet the manufacturer’s specifications. Using substandard or incorrectly specified parts may result in suboptimal performance or recurring issues.
• Not Clearing the Code Properly: After addressing the underlying issue and performing the necessary repairs, it’s important to clear the error code from the vehicle’s ECM using a proper OBD-II scanner. Neglecting to clear the code may result in the check engine light remaining illuminated or prevent the detection of new issues.
• Failing to Verify the Repairs: Once the repairs are completed, it’s crucial to test drive the vehicle and ensure that the P0135 code does not reappear. Overlooking this step may result in unresolved issues or missed problems.

FAQ:

Q: What is the P0135 code on a Chevy Silverado?

A: The P0135 code on a Chevy Silverado is a diagnostic trouble code that indicates a malfunction in the oxygen sensor heater circuit for Bank 1 Sensor 1. The oxygen sensor measures the oxygen levels in the exhaust gases and provides feedback to the engine control module (ECM) for optimal fuel efficiency and emissions control. The heater circuit is responsible for quickly bringing the oxygen sensor up to its operating temperature after the engine is started.

Q: What causes the P0135 code on a Chevy Silverado?

A: The P0135 code on a Chevy Silverado can be caused by several factors, including a faulty oxygen sensor, a malfunction in the heater circuit wiring, a blown fuse related to the heater circuit, a problem with the ECM, or exhaust system leaks. Proper diagnosis is essential to determine the exact cause.

Q: What are the symptoms of the P0135 code on a Chevy Silverado?

A: Symptoms of the P0135 code may include the illumination of the check engine light, decreased fuel efficiency, rough idling or stalling, poor acceleration or performance, and increased emissions. These symptoms can vary in severity and may indicate an issue with the oxygen sensor heater circuit.

Q: How serious is the P0135 code on a Chevy Silverado?

A: While the P0135 code may not pose an immediate safety threat, it should be addressed promptly. Ignoring the code can lead to reduced fuel efficiency, increased emissions, and potential damage to other engine components. Additionally, continued driving with a malfunctioning oxygen sensor may result in failed emissions tests and potentially more severe issues.

Q: How can I solve the P0135 code on a Chevy Silverado?

A: To solve the P0135 code, you should follow a diagnostic process that includes inspecting the wiring and connectors, checking the fuse and relay, testing the oxygen sensor, and clearing the code after repairs. It is advisable to consult a professional mechanic or refer to reliable repair manuals for accurate diagnosis and resolution.

Q: How much does it cost to fix the P0135 code on a Chevy Silverado?

A: The cost to fix the P0135 code can vary depending on factors such as the cause of the issue, the location of repairs, and labor rates. Costs may include diagnostic fees, replacement of the oxygen sensor or wiring components, and labor charges.