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
Often seen with P0709
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