P0723
Output Shaft Speed Sensor Circuit Intermittent
Transmission speed sensor
Generic OBD-II
High
What it means
P0723 means the transmission's output shaft speed sensor signal is cutting out intermittently. That sensor tells the controller how fast the output shaft is turning, so brief dropouts cause erratic or harsh shifts, speedometer glitches, and occasional limp mode. The cause is usually a loose connector or a failing sensor rather than the transmission itself.
High
Can I keep driving? Drivable, but expect erratic or harsh shifts and a possible limp mode when the signal drops out. Have it diagnosed before long trips.
Common symptoms
What you'll notice
- Erratic, harsh, or delayed shifting
- Transmission dropping into a fixed limp gear intermittently
- Speedometer glitching or reading zero at times
- Check-engine light on
Common causes
Most likely first
- Faulty output shaft speed sensorLikely
- Intermittent wiring fault — chafed, loose, or corroded connectorCommon
- Damaged reluctor / tone ring the sensor readsCommon
- Metal debris on the sensor tipLess often
- Failed transmission control module (least common)Less often
How to diagnose & fix
Work through it in order
- Scan and monitor output shaft speed live while driving to catch the dropout.
- Wiggle-test the sensor connector and harness to reproduce the intermittent fault.
- Inspect the sensor tip and connector for debris, corrosion, or a loose fit.
- Check the reluctor/tone ring for damaged or missing teeth.
- Replace the sensor or repair the wiring as found. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0723?+
Short-term yes, but when the speed signal cuts out the transmission may shift harshly or fall into limp mode, which is unsettling in traffic. Diagnose it soon.
Can I just clear P0723?+
Being intermittent, it may stay away briefly then return. Track down the loose wiring or failing sensor rather than repeatedly clearing it.
Related codes
Often seen with P0723
Read & clear P0723 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