P0708 – Transmission Range Sensor Circuit High

The P0708 trouble code relates to the transmission range sensor circuit and indicates a potential issue. When this code is triggered, it means that an illegal range has been detected for more than 1 second. Additionally, the code may be set if the transmission control module (TCM) detects a logic error on the IMS A, B, C, and P circuits.

When the P0708 code is present, the transmission may exhibit abnormal behavior, such as shifting to third or fifth gear when the selector is in drive or any other forward position. However, if the selector is moved to neutral or park, the transmission will shift to neutral. In addition, the code can cause freezing of shift adapts and inhibition of torque converter clutch engagement.

To diagnose this code, it is recommended to check the range selector lever cable adjustment and move the shift selector lever through all the ranges while monitoring the TR Sw. A/B/C/P parameters with a scan tool.

Key Takeaways:

• The P0708 code indicates a problem with the transmission range sensor circuit.
• Symptoms of this code can include hard shifting, transmission slippage, and the Check Engine Light illuminating.
• Possible causes of the code include a misadjusted or faulty transmission range sensor, damaged or disconnected wiring, or a faulty ECM.
• Diagnosing and repairing the code is important to prevent further transmission damage and maintain optimal vehicle performance.
• If professional assistance is not available, uploading the Engine Control Unit (ECU) file to a portal may provide an alternative solution for permanent removal of the P0708 code.

Symptoms of P0708 – Transmission Range Sensor Circuit High

The symptoms associated with a P0708 code, indicating a transmission range sensor circuit high, can vary but often include:

• Hard shifting
• Transmission slippage
• Transmission failure to shift
• Check Engine Light illumination

Additionally, when the P0708 code is present, the transmission may start in third gear when taking off from a complete stop. This can result in a lack of power and compromised vehicle performance. It is crucial to address this code promptly to avoid severe damage to the transmission system.

Causes of P0708 – Transmission Range Sensor Circuit High

When encountering the P0708 trouble code, it is important to consider the various potential causes. These causes can include:

• Misadjusted transmission range sensor
• Faulty transmission range sensor
• Damage or disconnection of wiring associated with the sensor
• Faulty ECM (Engine Control Module)

One commonly observed cause of the P0708 code is a misadjusted shift cable or linkage. This misadjustment can impact the position signals that the range sensor sends to the PCM (Powertrain Control Module) or TCM (Transmission Control Module).

To diagnose the exact cause of the P0708 code, it is essential to refer to the manufacturer’s recommended procedures and follow their guidelines.

Common Causes of P0708 – Transmission Range Sensor Circuit High:

1. Misadjusted transmission range sensor
2. Faulty transmission range sensor
3. Damage or disconnection of wiring associated with the sensor
4. Faulty ECM (Engine Control Module)

Diagnosing P0708 – Transmission Range Sensor Circuit High

To diagnose the P0708 code, a mechanic should begin by checking the manufacturer’s suggested procedure for adjusting the transmission range sensor. If an adjustment does not resolve the issue, the sensor should be tested according to the manufacturer’s recommendations. This may involve using a scan tool to monitor the TR Sw. A/B/C/P parameters and comparing them to the IMS A, B, C, and P circuit states. If the sensor or any wiring in the circuit is found to be defective, it should be repaired or replaced. In rare cases, a faulty ECM may be the cause of the code, requiring replacement.

If you’re experiencing trouble with your vehicle’s transmission and have encountered the P0708 code, it’s essential to properly diagnose and address the issue. Ignoring the code can lead to further transmission damage and affect overall vehicle performance. By following the manufacturer’s diagnostic procedures and conducting thorough testing, a qualified mechanic can identify the root cause of the problem and take appropriate action to rectify it.

One crucial step in diagnosing the P0708 code is adjusting the transmission range sensor according to the manufacturer’s guidelines. This adjustment can help determine if the sensor’s positioning is causing the circuit to register high or illegal ranges. Following the correct adjustment procedure is vital to ensure accurate diagnosis and avoid unnecessary repairs.

If adjusting the sensor does not resolve the issue, further testing should be conducted using a scan tool. This tool allows mechanics to monitor the TR Sw. A/B/C/P parameters and compare them to the IMS A, B, C, and P circuit states. By analyzing the data, technicians can identify any discrepancies or faults that may be triggering the code.

If the diagnosis reveals a defective sensor or wiring within the circuit, immediate repair or replacement is necessary. Faulty sensors can cause inaccurate range readings, leading to the P0708 code. Similarly, damaged or disconnected wiring can disrupt the proper transmission range sensor signals, resulting in circuit high readings. Addressing these issues promptly can prevent further complications or damage to the transmission.

In rare cases, the faulty ECM may be the underlying cause of the P0708 code. The ECM, or Engine Control Module, is responsible for receiving and interpreting signals from various sensors, including the transmission range sensor. If the ECM is malfunctioning, it may improperly communicate with the sensor, causing circuit high errors. If other potential causes have been ruled out, inspecting and replacing a faulty ECM may be necessary.

Overall, diagnosing the P0708 code requires a systematic approach that includes following the manufacturer’s recommended procedures, performing necessary adjustments, conducting thorough testing with a scan tool, and inspecting components for defects. By understanding the underlying cause of the code, mechanics can effectively address the issue, ensuring optimal vehicle performance and preventing further transmission damage.

Repairing P0708 – Transmission Range Sensor Circuit High

The repair for a P0708 code will depend on the specific cause of the issue. Here are the possible repair steps to address the problem:

1. Adjustment of the Transmission Range Sensor: If the transmission range sensor is misadjusted, it should be properly adjusted according to the manufacturer’s instructions.
2. Replacement of Faulty Sensor: If the sensor is found to be faulty, it will need to be replaced with a new one. This will ensure the accurate functioning of the transmission range sensor circuit.
3. Repair Damaged or Disconnected Wiring: If there are any damaged or disconnected wires associated with the transmission range sensor, they should be repaired or reconnected as necessary. Proper functioning wiring is essential for the sensor to communicate effectively with the PCM or TCM.
4. Possible Replacement of Faulty ECM: In some cases, a faulty Engine Control Module (ECM) may be the cause of the P0708 code. If all other repair steps fail to resolve the issue, the ECM may need to be replaced with a functioning one.

It is crucial to follow the manufacturer’s repair instructions for each specific repair step. After completing the repairs, it is recommended to perform a diagnostic repair verification to ensure the P0708 code has been successfully addressed.

Performing these repair steps will help ensure the proper functioning of the transmission range sensor circuit, addressing the P0708 code and preventing further transmission-related issues.

Importance of Addressing P0708 – Transmission Range Sensor Circuit High

Addressing the P0708 code is crucial as it can lead to drivability issues and potentially severe transmission damage. Ignoring this code can result in hard shifting, transmission slippage, and a lack of power during acceleration. It is recommended to have this code diagnosed and repaired as soon as possible to avoid costly transmission repairs down the line.

Failure to address the P0708 code can have significant consequences for the vehicle’s performance and longevity. A malfunctioning transmission range sensor circuit can cause the transmission to shift improperly, leading to harsh and erratic gear changes. This can not only impact the driving experience but also put additional strain on the transmission components, potentially resulting in severe damage.

Furthermore, the P0708 code can cause transmission slippage, where the transmission fails to engage properly, leading to a loss of power and reduced acceleration. This can be not only frustrating but also dangerous, especially in situations where quick acceleration is necessary, such as merging onto a highway or passing another vehicle.

By promptly addressing the P0708 code, you can avoid these potential issues and maintain the overall performance and reliability of your vehicle. A professional diagnosis and repair will help identify the specific cause of the code and ensure that any necessary adjustments or repairs are made to restore the proper functioning of the transmission range sensor circuit.

Remember, the cost of repairing the P0708 code is typically much lower than the potential expenses associated with a severely damaged transmission. Ignoring the code and allowing the transmission issues to worsen can result in the need for a complete transmission overhaul or replacement, which can be a costly endeavor.

To summarize, it is of utmost importance to address the P0708 code in a timely manner to prevent drivability issues, avoid severe transmission damage, and save money on potential future repairs. Don’t delay in seeking professional assistance and ensure that any necessary repairs are carried out promptly and accurately.

Conclusion

In conclusion, the P0708 trouble code indicates a problem with the transmission range sensor circuit. This code can manifest through symptoms such as hard shifting, transmission slippage, and the illumination of the Check Engine Light. The causes of this code can vary, ranging from a misadjusted range sensor to a faulty ECM.

Diagnosing and repairing the P0708 code is essential to prevent further transmission damage and ensure optimal vehicle performance. It is recommended to consult a professional mechanic for proper diagnosis and repair. Following the manufacturer’s suggested procedures for adjustment or replacement of the transmission range sensor, as well as repairing any damaged wiring, will help resolve the issue.

If professional assistance is not available, an alternative solution could be the permanent removal of the P0708 code by uploading the Engine Control Unit (ECU) file to a portal. However, it is crucial to note that this approach should only be considered as a last resort and is not a comprehensive fix for the underlying issue.