2000 Saturn OBD2 Code P0708: Transmission Range Sensor Circuit High Input

The dreaded P0708 code on your 2000 Saturn can be a real headache. This diagnostic trouble code (DTC) specifically points to a problem with the Transmission Range Sensor (TRS), more accurately, a “Transmission Range Sensor Circuit High Input” issue. Understanding what this code means, its potential causes, and how to diagnose it can save you time and money.

Understanding the P0708 Code in Your 2000 Saturn

The Transmission Range Sensor, also known as the neutral safety switch or park/neutral position switch, tells the Powertrain Control Module (PCM) what gear your Saturn is in. When the PCM receives a signal outside the normal operating range, specifically a high input voltage from the TRS circuit, it triggers the P0708 code. This essentially means the PCM is receiving incorrect information about your car’s gear position. This can lead to various driving issues and prevent your Saturn from starting.

Common Causes of the P0708 Code

Several issues can cause the P0708 code in your 2000 Saturn. Here are some of the most common culprits:

Faulty Transmission Range Sensor: The most likely cause is a malfunctioning TRS itself. Over time, the sensor can wear out, become corroded, or simply fail.
Wiring Problems: Damaged, corroded, or loose wiring in the TRS circuit can interrupt the signal and cause the P0708 code.
Transmission Fluid Issues: Low transmission fluid or contaminated fluid can affect the TRS operation.
Shift Linkage Problems: Issues with the shift linkage can prevent the TRS from accurately reporting the gear position.
PCM Issues: In rare cases, the problem may lie with the PCM itself, although this is less common than the other causes.

2000 Saturn Transmission Range Sensor Location

Diagnosing the P0708 Code: A Step-by-Step Guide

Diagnosing the P0708 code requires a systematic approach. Here’s a step-by-step guide to help you pinpoint the problem:

Check the Transmission Fluid: Ensure the transmission fluid level is correct and the fluid is clean. Low or dirty fluid can contribute to TRS problems.
Inspect the Wiring: Carefully examine the wiring harness connected to the TRS. Look for any signs of damage, corrosion, or loose connections. Repair or replace any damaged wiring as needed.
Test the TRS: Using a multimeter, test the resistance and voltage of the TRS according to the manufacturer’s specifications. This will help determine if the sensor is functioning correctly.
Check the Shift Linkage: Inspect the shift linkage for proper operation. Ensure it moves freely and correctly engages each gear position.
Consult a Professional: If you’re not comfortable working on your car’s electrical system, it’s best to consult a qualified mechanic. They have the tools and expertise to accurately diagnose and repair the problem.

Testing the Transmission Range Sensor with a Multimeter

What Happens If You Ignore the P0708 Code?

Ignoring the P0708 code can lead to further problems, such as:

Difficulty Shifting: You may experience problems shifting gears, making driving difficult or even dangerous.
No Start Condition: The car may not start if the PCM receives incorrect information about the gear position.
Reduced Fuel Economy: The engine may not operate efficiently, leading to decreased fuel economy.
Transmission Damage: In some cases, ignoring the P0708 code can lead to serious transmission damage.

“Ignoring a P0708 is like ignoring a flashing check engine light – it’s asking for trouble down the road,” says John Miller, a certified ASE Master Technician with over 20 years of experience. “Addressing the issue promptly can save you from costly repairs later.”

2000 Saturn OBD2 Scanner Reading P0708 Code

Conclusion: Fixing the 2000 Saturn OBD2 Code P0708

The P0708 code in your 2000 Saturn indicates a problem with the Transmission Range Sensor circuit. Addressing this issue promptly is crucial to prevent further problems and ensure your car runs smoothly. By following the diagnostic steps outlined in this article, you can identify the cause of the problem and take the necessary steps to fix it. Remember, a correctly functioning TRS is essential for safe and efficient driving.

FAQ

What does the P0708 code mean? It indicates a problem with the Transmission Range Sensor circuit, specifically a high input voltage.
Can I drive my car with a P0708 code? While you might be able to drive, it’s not recommended, as it could lead to further damage.
How much does it cost to fix a P0708 code? The cost varies depending on the underlying cause, but it typically ranges from a few hundred to over a thousand dollars.
Where is the Transmission Range Sensor located? It’s typically located on the transmission housing.
How do I reset the P0708 code? After repairing the issue, you can reset the code using an OBD2 scanner.
Can I fix the P0708 code myself? If you have some mechanical experience, you might be able to fix it yourself. However, it’s often best to consult a professional.
What are the symptoms of a P0708 code? Symptoms can include difficulty shifting, no start condition, and reduced fuel economy.

Need more help? Check out our articles on OBD2 codes and car diagnostics.

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