P0709 means Transmission Range Sensor A Circuit Intermittent. The transmission range sensor signal is dropping out or changing unexpectedly. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0709 means
Electronically controlled automatics are run by a transmission control module (TCM), a separate box or part of the engine computer. It reads speed sensors, the range sensor and fluid temperature to decide when to shift, and drives solenoids that apply clutches and the torque converter clutch. Many basic code readers only show the generic P0700; a scan tool that reads the transmission module shows the specific fault. Check fluid level and condition first, since low or burnt fluid causes many transmission codes.
P0709 symptoms
- Intermittent no-start
- Gear indicator flickering
- Shift problems that come and go
Common causes of P0709
- Loose or corroded connector
- Wiring rubbing on the transmission
- Worn sensor contacts
How to diagnose P0709
- Wiggle-test the harness while watching the range reading
- Inspect and clean the connector
- Check sensor adjustment
Can you drive with P0709?
Use caution until fixed.
P0709 tips
Intermittent range sensor faults can cause the engine to crank only in neutral; try neutral as a quick workaround and diagnosis clue.
Will P0709 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0709 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0705 | Transmission Range Sensor Circuit Malfunction (PRNDL Input) |
| P0707 | Transmission Range Sensor A Circuit Low |
| P0708 | Transmission Range Sensor A Circuit High |
Guides that help
When it is more than a sensor
If the fault turns out to be internal (worn clutches, a failed converter or a damaged valve body), compare a rebuild with a replacement in transmission rebuild vs replacement and transmission replacement cost, identify your unit with what transmission do I have?, and browse our transmissions.
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