P0707
UniversalTransmission Range Sensor Circuit Low Input
Medium SeverityThis code indicates that the Powertrain Control Module (PCM) is receiving a low voltage signal from the Transmission Range Sensor (TRS), which is also known as the Neutral Safety Switch. This low input means the PCM cannot accurately determine the transmission's current gear position, potentially affecting starting, shifting, and proper operation of reverse lights.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely supported on jack stands and the parking brake is engaged when working underneath. Disconnect the battery before performing any electrical work to prevent accidental shorts or injury. Allow the engine and transmission to cool down completely before touching any components.
Common Symptoms
- Check Engine Light illuminated
- Vehicle will not start
- Vehicle starts in gears other than Park or Neutral
- Transmission stuck in one gear
- Rough or delayed shifting
- Backup lights do not work
- Incorrect gear display on dashboard
Common Causes
- Faulty Transmission Range Sensor (TRS)
- Corroded or damaged wiring or connectors leading to the TRS
- Open or short in the TRS circuit
- Poor electrical connection at the TRS or PCM
- Faulty Powertrain Control Module (PCM) (rare)
Frequently reported on: Ford F-150 (2004-2008), Honda Accord (2003-2007), Chevrolet Silverado (2007-2013), Toyota Camry (2002-2006), Nissan Altima (2007-2012)
Diagnostic Steps
- Retrieve and confirm the P0707 code with an OBD-II scanner.
- Visually inspect the Transmission Range Sensor and its wiring harness for any signs of damage, corrosion, or loose connections. Pay close attention to frayed wires or bent pins.
- Disconnect the battery.
- If visible damage is found, repair or replace the affected wiring or connector.
- Test the Transmission Range Sensor's resistance or voltage output using a multimeter according to your vehicle's service manual specifications.
- If the sensor tests faulty, replace the Transmission Range Sensor. This often requires accessing the side of the transmission.
- Reconnect the battery and clear the P0707 code using your OBD-II scanner.
- Test drive the vehicle to ensure the issue is resolved and the code does not return.
👨🔧 When to Call a Professional
If you've replaced the Transmission Range Sensor and are still experiencing the P0707 code, or if you suspect extensive wiring damage or a PCM issue, it's time to consult a professional technician. Advanced electrical diagnostics are often required to pinpoint more complex circuit faults.
Commonly Asked Questions
Can I drive my car with a P0707 code?
It is not recommended to drive with a P0707 code. It can lead to unpredictable shifting, inability to start, or unexpected movement, posing significant safety risks.
What is the Transmission Range Sensor?
The Transmission Range Sensor (TRS) tells your car's computer what gear the transmission is currently in (Park, Reverse, Neutral, Drive). It's crucial for engine starting, reverse lights, and proper gear selection.
How can I test the Transmission Range Sensor?
You can test the TRS using a multimeter to check for continuity and resistance across its terminals in different gear positions. Consult your vehicle's specific service manual for the correct pinout and expected values.
What if replacing the sensor doesn't fix the P0707 code?
If replacing the TRS doesn't resolve the issue, the problem likely lies in the wiring harness leading to the sensor, or potentially a fault within the Powertrain Control Module (PCM). A thorough electrical diagnostic is then required to trace the circuit for opens or shorts.
Is the Transmission Range Sensor the same as the Neutral Safety Switch?
Yes, in many vehicles, the Transmission Range Sensor performs the function of the Neutral Safety Switch, preventing the engine from starting unless the transmission is in Park or Neutral.