P0709
Transmission Range Sensor A Circuit Intermittent
Transmission controls
Generic OBD-II
High
What it means
P0709 means the transmission range sensor — which tells the computer whether you're in Park, Reverse, Neutral, or Drive — is sending an intermittent signal. Because this sensor also enables the starter in Park/Neutral, an intermittent fault can cause erratic shifting, a wrong-gear display, and occasional no-crank conditions until it's repaired.
High
Can I keep driving? Drivable but unpredictable — the gear-position signal can drop out, causing erratic shifts, a wrong-gear display, and sometimes an intermittent no-crank. Get it fixed soon.
Common symptoms
What you'll notice
- Erratic, harsh, or delayed shifting
- Gear indicator (PRNDL) shows the wrong gear or flickers
- Intermittent no-crank/no-start in Park or Neutral
- Check-engine light on, sometimes with a transmission warning
Common causes
Most likely first
- Faulty transmission range (PRNDL) sensorLikely
- Intermittent open/short in the range sensor wiring or connectorCommon
- Corroded or loose electrical connectionsCommon
- Misadjusted range sensor or shift linkageLess often
- Faulty TCM/ECM (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note when the dropout occurs.
- Wiggle-test the range sensor wiring and connector while watching the gear data on a scan tool.
- Inspect and, if applicable, adjust the range sensor to the shift linkage.
- Test the sensor's signal across all gear positions.
- Repair the intermittent fault, clear the code, and retest.
FAQ
Quick answers
Is it safe to drive with P0709?+
It's drivable but unpredictable — shifts can be erratic and the car may occasionally fail to crank in Park or Neutral. Fix it soon to avoid being stranded.
Can I just clear P0709?+
It comes back the next time the signal drops out. The intermittent wiring or sensor fault has to be found and repaired for the code to stay away.
Related codes
Read & clear P0709 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX