P0708 Trouble Code: Meaning, Symptoms, Causes & Fixes

If you’re seeing a P0708 trouble code light up on your dash, you’re probably looking for clear, accurate guidance on what it means and how to fix it.

This guide will cover the essential information, from symptoms to solutions, ensuring you know precisely how to tackle this issue.

Having worked on numerous cars displaying the P0708 code, I’ve seen firsthand the frustrations and solutions associated with this error.

In this article, we’ll dive into the specifics of the P0708 trouble code. You’ll learn why it occurs, typical symptoms to watch for, probable causes, and step-by-step repair instructions.

Now, let’s kick things off and dig deeper into resolving the P0708 trouble code.

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What Does P0708 Trouble Code Mean?

When your vehicle’s diagnostic system triggers the P0708 trouble code, it’s indicating a specific issue: the Transmission Range Sensor Circuit has detected a high input.

This sensor, crucial in modern vehicles, communicates the position of the gear lever to the vehicle’s computer system (PCM or ECM).

It ensures the engine and transmission work in sync by relaying whether the transmission is in park, neutral, or a driving gear.

The P0708 error lights up when there’s a mismatch between the actual gear position and the signal the sensor sends to the PCM.

For example, you might have shifted to ‘Drive,’ but due to a faulty sensor or wiring, the PCM receives a signal corresponding to another gear, or even no signal at all.

This discrepancy prompts the PCM to log the P0708 trouble code and can activate the Check Engine Light or Transmission Warning Light.

This situation often points to either an electrical issue, such as frayed wiring, or a mechanical problem like a misaligned or defective transmission range sensor.

The result of this malfunction is not just a warning light; it can significantly affect driving performance. Your vehicle might experience issues like starting in the wrong gear, inability to start, or shifting problems.

In some cases, the transmission might not shift at all, which can lead to safety concerns if not addressed promptly.

Understanding the P0708 code is crucial because it directly affects the vehicle’s operational safety and efficiency.

Addressing it swiftly can prevent further complications, especially those related to transmission control and response. The immediate impact is on drivability, but the long-term consequences can extend to significant transmission damage if ignored.

P0708 Trouble Code Symptoms

The P0708 trouble code can manifest through various symptoms that affect vehicle performance. Here’s a rundown of common signs to watch for:

• Check Engine Light or Transmission Warning Light is on
• Vehicle starts in the wrong gear
• Inability to start the engine at times
• Erratic or improper shifting
• Transmission fails to shift at all
• Decreased fuel efficiency
• Unusual noises, such as grinding, when shifting gears

P0708 Trouble Code Causes

The P0708 trouble code can be triggered by a variety of factors that disrupt normal transmission range sensor operations. Here are the most common causes:

• Faulty or misaligned transmission range sensor
• Damaged or corroded wiring and connectors in the sensor circuit
• Short circuits or open circuits within the transmission sensor’s wiring
• Problems with the vehicle’s transmission control module (TCM)
• Contaminated or low transmission fluid affecting sensor operation
• Mechanical transmission issues that affect sensor input

How To Fix A P0708 Trouble Code

Fixing a P0708 trouble code involves several steps, primarily focusing on diagnosing and addressing issues related to the transmission range sensor and its circuit. Here’s how you can pinpoint and resolve the problem:

1. Diagnostic Scan

Start by using an OBD-II scanner to confirm the presence of the P0708 code and check for any other related codes. Codes linked to transmission issues or sensor malfunctions should be addressed together.

2. Visual Inspection

Inspect the transmission range sensor and its connections for any obvious signs of damage such as corrosion, wear, or loose connections. Look over the wiring leading to and from the sensor for frays, cuts, or disconnections.

3. Check Transmission Fluid

Low or dirty transmission fluid can cause transmission issues that might trigger the P0708 code. Verify the fluid level and quality, and replace or top up as necessary.

4. Sensor Testing

Test the transmission range sensor with a multimeter to ensure it’s functioning correctly. The sensor should have specific resistance values as outlined in your vehicle’s repair manual. If readings are outside of the recommended range, the sensor needs replacement.

5. Circuit Testing

Using a multimeter, check the continuity of the wiring and circuits associated with the transmission range sensor. Lack of continuity suggests a broken wire or faulty connection that needs repair.

6. Replace Faulty Components

If diagnostics point to a defective transmission range sensor or damaged wiring, replace these components. Ensure all connections are secure and aligned according to the manufacturer’s specifications.

7. Clear the Code and Test Drive

After repairs, clear the trouble code with an OBD-II scanner and take the vehicle for a test drive to ensure that the repair has addressed the issue, and the P0708 code does not reappear.

Addressing the P0708 trouble code effectively requires careful attention to both the electronic and mechanical aspects of your vehicle’s transmission system. Proper diagnostics and precise repairs are crucial to ensure your vehicle operates safely and efficiently.

Conclusion

Now that you’ve got the lowdown on the P0708 trouble code, you understand what triggers it and how you can tackle the issue.

Have you ever dealt with a transmission range sensor problem before?

Feel free to share your experiences or tips on handling this code in the comments below!