07 Duramax Throttle Position Sensor Problems [+2 Solutions]

This article will discuss two common Duramax throttle position sensor problems and their solutions. We have compiled this information based on our years of experience working with diesel engines and consulting with industry experts. By understanding these issues and their remedies, you can avoid costly repairs and keep your truck running smoothly for years.

This article will discuss 07 Signs of a bad throttle position sensor.

Duramax Throttle Position Sensor Problems [07 Problems]

The throttle position sensor (TPS) is crucial to the Duramax diesel engine’s performance. It senses the position of the accelerator pedal and sends signals to the engine control module (ECM) to adjust fuel injection, ignition timing, and other parameters. Some Duramax owners have reported various TPS problems that affect their trucks’ drivability, fuel efficiency, and safety.

When the throttle position sensor goes bad, it causes several problems.

• Acceleration issue
• Fuel efficiency
• Check engine warning light
• Throttle valve misleading
• The flat signal from the sensor
• Unstable engine idling/ Shakes while idling

Let’s discuss them elaborately.

Acceleration Issue

A common symptom of a faulty TPS is an acceleration issue where the truck fails to respond adequately when you step on the gas pedal. Your vehicle could take longer than usual to pick up speed or stall altogether. These frustrating symptoms are often caused by a worn-out sensor that can no longer provide accurate readings on throttle position or engine RPMs.

• Accelerates Itself

One possibility is a problem with the throttle position sensor itself. If it sends incorrect signals to the engine control module, it could cause the engine to accelerate on its own. 

• Hesitant to Accelerate

Hesitation during acceleration can be frustrating and dangerous when driving on busy roads. If you experience this issue with your Duramax engine, you should check your TPS immediately. A faulty TPS can cause inaccurate readings that result in an unstable air/fuel ratio and less-than-optimal performance from your vehicle. 

Fuel Efficiency

This occurs when the sensor sends incorrect signals to the computer, causing it to adjust fuel delivery inappropriately. As a result, you may notice that your truck has become less efficient over time. Another problem with a failing TPS is rough idling or stalling at low speeds. This can be frustrating and even dangerous in certain situations.

Your engine won’t last 150k miles if the TPS is faulty.

Check the Engine Warning Light

Check the engine warning light on your dashboard. This light indicates an issue with one or more components of your vehicle’s powertrain system, including its sensors. If you notice this warning light turning on while driving or starting up your truck, you must immediately visit a reputable mechanic who understands Duramax diesel engines.

Miscalculated Position of Throttle Valve

The throttle position sensor communicates with the engine’s computer to determine how much fuel to inject into the cylinders. If this sensor malfunctions or fails, it can cause problems with your engine’s performance, including decreased fuel mileage and acceleration issues. One common issue associated with a faulty TPS is that it may cause your vehicle to stall out unexpectedly while driving.

Flat Signal from the Sensor

When the TPS is faulty, the computer may read a flat signal from the sensor.

A flat signal means that no matter how much you press on the pedal, fuel injection will not change. This can cause acceleration problems and stall or rough idling when coming to a stop. It may trigger warning lights on your dashboard, such as a check engine light or reduced power mode.

Unstable Engine Idling

Sometimes, you may notice that your truck’s RPM fluctuates while sitting idle or even stalls altogether. This can be dangerous if it happens while driving because you will also lose power steering and brakes. If you experience this issue frequently, it’s best to get your TPS checked by a professional mechanic before further damage occurs to your vehicle’s internal systems.

Improper Gear Shifting

This issue typically occurs when accelerating from a stop or while driving at highway speeds, where sudden speed changes can cause abrupt gear changes. When this happens, you may notice rough shifting or hesitation while accelerating and reduced fuel economy due to inefficient gear selection.

Can I Drive with a Bad Throttle Position Sensor in My Duramax?

Yes, you can drive with a bad throttle position sensor in your Duramax, but it is not recommended. The throttle position sensor (TPS) is responsible for communicating the position of your accelerator pedal to the engine control module (ECM). When the TPS fails or malfunctions, it can cause several issues affecting your vehicle’s performance and safety.

Solutions for Throttle Position Sensor Problems

No need to worry if you notice signs of bad throttle position sensors in your vehicle.

There are 2 solutions to this problem.

Re-installing the TPS

One possible solution for TPS problems is reinstalling it properly. When installing or changing a TPS, it’s crucial to ensure that all parts are accurately aligned and tightened as per the manufacturer’s specifications. Failure to do so can result in incorrect sensor readings, poor performance, or even stalling your engine.

Re-Installing Process of a Throttle Position Sensor

You can remove and reinstall the TPS in 8 simple steps.

Step 1: Disconnect the negative battery wires

Step 2: Find out the throttle position sensors

Step 3: Now disconnect the TPS sensor electrical connector

Step 4: Pull out the TPS sensor retaining screws

Step 5: Now remove the TPS sensor

Step 6: Clean the TPS by using compressed air or blowing it into the connector

Step 7: Re-install the TPS sensor and tighten the retaining screws to 90 inches lbs. approximately (10 nm)

Step 8: Connect the TPS sensor electrical wires

When resetting/reinstalling fails, replacing the throttle position sensor is highly recommended.

How to Replace a Throttle Position Sensor [DIY Method] 

You can easily replace the throttle position sensor by following simple steps.

Step 1

Before replacing the TSP, gather the necessary tools, including a 10mm socket, flat head screwdriver, and a new throttle position sensor. It is recommended to wear work gloves and safety glasses for your protection.

Step 2

To prevent electrical shock or an error code on your ECM, detach the negative battery cables and remove the electrical connectors for the throttle position sensor.

Step 3

Detach the electrical connectors and unscrew the clips to remove the throttle position sensor. To prevent purchasing unnecessary TPS, it is advisable to carefully review the owner’s manual before making any purchase.

Step 4

Install the new throttle position sensor now.

Step 5

Connect the throttle position sensor connectors.

Step 6

Install the air intake duct.

Step 7

Join the cables of the battery with negative polarity. Verify your work twice.

Step 8

Commence the operation of your automobile and assess its performance at rest and while speeding up. If you encounter any difficulties while substituting the TPS, we suggest seeking the assistance of a professional mechanic.

Price of a Duramax Throttle Position Sensor

The price of a Duramax TPS varies depending on several factors, such as the manufacturer, quality, location, and year of your vehicle. On average, you can expect to pay anywhere from $40 to $150 for an aftermarket TPS. If you opt for an OEM (original equipment manufacturer) apart from General Motors or ACDelco, you may have to spend around $200 to $300.

Conclusion 

The 07 Duramax Throttle Position Sensor problems can be a headache for truck owners. The symptoms may range from poor acceleration to engine stalling, causing inconvenience and even danger on the road. Being aware of the signs and getting regular maintenance can help prevent these issues from occurring. Replacing the sensor when it fails is crucial to maintaining the optimal performance of your truck.

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