P0707: Transmission Range Sensor Circuit Low (Meaning, Causes, Fixes)
What P0707 means
The transmission range sensor (TRS), also called the PRNDL input or neutral safety switch, tells the transmission control module (TCM) and powertrain control module (PCM) whether the transmission is in park, reverse, neutral, drive or a lower gear. RepairPal says it is attached directly to the transmission's manual valve. OBD-Codes.com explains that the sensor receives a voltage signal and changes or reroutes it according to shifter position; "circuit low" means low or no voltage is returning to the PCM. An open circuit anywhere between the fuse, the sensor and the PCM, or a short that blows the fuse, will both set P0707. It is a generic OBD-II code, though repair steps vary by make and model. The sources describe it differently: OBD-Codes.com treats it as a specific low-voltage circuit fault, while RepairPal's description uses the same general wording it uses for other range sensor codes (the PCM sets the code when the sensor input is erratic or irrational). They also disagree on the warning light: OBD-Codes.com calls P0707 a non-emission "C" type code that does not turn on the check engine light but may make the overdrive (O/D) or D4 indicator blink, while RepairPal does not address the light. Related codes are P0705 (circuit malfunction), P0706 (range/performance), P0708 (circuit high) and P0709 (intermittent).
Severity: can I keep driving?
Stop and fix promptly
Get it fixed soon. OBD-Codes.com says there is a safety factor with this code and it should be repaired as soon as possible, because the range sensor usually contains the park/neutral switch and the car may refuse to start or could even start in gear. RepairPal rates P0707 Urgent. Until it's repaired, set the parking brake and keep your foot on the brake whenever you start the engine.
Common symptoms
- Engine may not start, because the park/neutral switch is built into most range sensors (OBD-Codes.com)
- Erratic shifting, or the transmission may not shift properly (both sources)
- Engine could possibly start in gear (OBD-Codes.com)
- Lack of power from the transmission going into limp-home mode (OBD-Codes.com)
- Overdrive (O/D) or D4 light blinking; OBD-Codes.com says this code does not turn on the check engine light
- Increased fuel consumption (RepairPal)
Likely causes
Roughly most to least common, based on the sources below. Your vehicle may differ.
- Open or shorted wiring in the range sensor circuit (both sources)
- Blown fuse caused by a short circuit (OBD-Codes.com)
- Faulty transmission range sensor (both sources)
- Misadjusted transmission range sensor (OBD-Codes.com)
- Faulty PCM or TCM; OBD-Codes.com says a faulty PCM is rare in its experience, while RepairPal lists both modules among common problems
Diagnostic steps you can do
Work on a cool engine, parked on level ground with the parking brake set. Never work under a car supported only by a jack.
- Read all stored codes before clearing anything, since P0707 often appears alongside other transmission codes.
- Set the parking brake and block the wheels before testing, because the car could start in gear.
- Check the fuse that feeds the range sensor; OBD-Codes.com says a short in the circuit will blow it and cause low voltage at the PCM.
- Inspect the range sensor connector and harness for damage, corrosion or chafing and repair anything you find.
- OBD-Codes.com's voltage test: check for voltage at the fuse side, at the sensor's input and at the sensor's output to the PCM. Voltage going in but not coming out points to a faulty range sensor; voltage at the output points to shorted wiring or, rarely, the PCM; voltage only at the fuse side means check the fuses and wiring.
- Follow your vehicle's service manual for sensor location, wiring diagram and adjustment, since these vary by make.
Typical fixes
- Replace a blown fuse and repair the short that caused it
- Repair open or shorted range sensor wiring or connectors
- Readjust a misadjusted transmission range sensor
- Replace a faulty transmission range sensor
- Replace or reprogram the PCM or TCM only after everything else checks out
Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.
🛠 When to call a pro
- The engine won't start, or it starts with the shifter in drive or reverse
- The transmission is stuck in limp mode or shifts erratically
- Fuses keep blowing or you can't find the short
- You've checked the fuse, wiring and sensor and the code comes back
Where to buy
Plain search links. Always match parts to your exact year, make, model and engine.
FAQs
Is P0707 serious?
Yes. OBD-Codes.com says there is a safety factor and it should be repaired as soon as possible, since the car may not start or could start in gear. RepairPal rates it Urgent.
Why is there no check engine light with P0707?
OBD-Codes.com describes P0707 as a non-emission "C" type code that doesn't turn on the check engine light, though it may make the O/D or D4 light blink. You may only find the code by scanning.
What's the difference between P0706 and P0707?
P0706 means the range sensor's signal doesn't make sense for how the car is being driven. P0707 means the computer sees low or no voltage returning from the sensor, usually an open circuit, a short or a blown fuse.
How much does it cost to fix P0707?
Neither source gives a repair cost. It depends on whether the fix is a fuse, wiring, an adjustment or a new sensor, so get a diagnosis or a written estimate first.
Sources
Last reviewed 2026-10-25. Code definitions and repair steps can vary by manufacturer. Confirm with your vehicle's service information.