The OBD-II code P0708 indicates an issue with the Transmission Range Sensor, also known as the PRNDL input or neutral safety switch. This sensor plays a crucial role in communicating the vehicle’s transmission position to the engine control module (PCM) and transmission control module (TCM).
What Does the P0708 Code Mean?
When the P0708 code is set, it signifies that the Transmission Range Sensor is reporting a high input signal. This situation often results from erratic or irrational signals from the sensor, alerting the PCM to a potential malfunction in the transmission system.
What Causes the P0708 Code?
Several factors may contribute to the triggering of the P0708 code:
- Defective Transmission Range Sensor (PRNDL input)
- Faulty wiring or connector related to the Transmission Range Sensor
- Issues with the Manual Valve or its linkage
- Dirty transmission fluid that obstructs hydraulic passages
What Are the Symptoms of the P0708 Code?
Drivers may experience various symptoms when the P0708 code is present, including:
- Illumination of the Check Engine Light
- Improper shifting of the vehicle
- The vehicle may fail to engage into gear
- A decrease in fuel economy
- In some cases, no noticeable adverse conditions
- Potential performance problems
How Serious Is the P0708 Code?
The P0708 code is categorized as urgent, indicating that immediate attention is necessary. Ignoring this code could lead to severe damage to the vehicle’s transmission system and potentially pose safety risks to the driver and passengers.
How to Diagnose the P0708 Code
Diagnosing the P0708 code involves several steps:
- Record the freeze frame information from the vehicle’s computer.
- Perform a test drive to replicate the conditions under which the code was set, aiming for speeds of 15-35 mph.
- Monitor the scan data to ensure the Range Sensor is providing accurate information to the TCM and PCM.
- Conduct pinpoint tests, including voltage drops and continuity tests of the Transmission Range Sensor.
- Check the condition of the transmission fluid for clarity and cleanliness.
Common Repairs for the P0708 Code
Common repairs that may be needed to fix the P0708 code include:
- Replacing the faulty Transmission Range Sensor
- Repairing or replacing damaged wiring or connectors
- Fixing or replacing the Manual Valve or its linkage
- Changing the transmission fluid if it is dirty or contaminated
How Much Does It Cost to Fix the P0708 Code?
The cost to repair the P0708 code can vary widely based on the specific issue identified during diagnosis. On average, repairs may range from $100 to $800, depending on whether parts need to be replaced or if additional labor is required.
Can I Fix the P0708 Code Myself?
While some DIY enthusiasts may be able to address minor issues, such as replacing the Transmission Range Sensor or checking fluid conditions, it is crucial to have a proper understanding of the diagnostic process. If you lack experience, it may be best to consult with a professional mechanic to avoid further complications.
