Input/Turbine Shaft Speed Sensor A Circuit Intermittent
What it means
P0718 means the transmission input/turbine speed sensor signal is dropping out intermittently. This sensor tells the transmission computer how fast the input shaft is turning, which it uses to time shifts. An intermittent signal causes erratic or harsh shifting and can trigger limp mode, though the engine itself still starts and runs.
Can I keep driving? Drivable but expect erratic or harsh shifting and possible limp mode; get it fixed to avoid being stuck in a single gear.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light on
- Erratic, harsh, or delayed shifting
- Transmission dropping into limp mode (often locked in one gear)
- Poor fuel economy or flaring between shifts
Common causes
Most likely first
- Faulty input/turbine speed sensorLikely
- Intermittent open/short or chafed wiring in the sensor circuitCommon
- Loose or corroded connectorCommon
- Metal debris on the sensor tip or a damaged tone ringLess often
How to diagnose & fix
Work through it in order
- Scan and note the freeze-frame conditions when the dropout occurs.
- Wiggle-test the sensor connector and harness while monitoring the signal.
- Inspect the sensor tip for metal debris and check its air gap.
- Replace the sensor if it reads intermittently with good wiring, then clear and road-test.
FAQ
Quick answers
Is it safe to drive with P0718?+
Can I just clear P0718?+
Related codes
Read & clear P0718 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.