garajizOBD-II code · generic
P0715
Input/Turbine Speed Sensor 'A' Circuit
- System
- Transmission
- Severity
- Moderate (3/5)
- Can I keep driving?
- Drive with caution
What does P0715 mean?
P0715 is defined as “Input/Turbine Speed Sensor 'A' Circuit”. P0715 reports that no signal is received from the sensor measuring the automatic transmission's input shaft (turbine) speed, or that the signal is electrically faulty. The TCM uses this signal to calculate torque converter slip and shift timing; when it is lost, the transmission usually goes into limp mode, locked in 3rd or 4th gear. It is common on Hyundai/Kia A4CF/A6 series, Ford 4F27E/6F35 and Aisin transmissions; Kia's “input shaft speed sensor error” is the same fault.
Drive gently and only as far as you need to; have it checked as soon as possible.
Symptoms
- Transmission going into limp mode, staying in one gear
- Harsh or delayed gear changes
- Transmission/warning light on the dashboard; on some models the rev counter flickers
- Speedometer fluctuating (on cars that share the sensor)
Common causes
- Failed input speed sensor (magnetic/Hall sensor)
- Oil leak or corrosion in the sensor connector
- Open or short circuit in the sensor wiring harness
- Metal swarf build-up on the sensor tip
- TCM failure (rare)
How to diagnose it
- Compare turbine speed with engine speed in live data: with the converter locked they should be close.
- On an inductive sensor measure resistance (typically 300–1200 Ω); on a Hall-type sensor check the 5 V/12 V supply.
- Watch the signal on an oscilloscope with the engine running: you should see a regular AC or square wave.
- Remove the sensor and clean the swarf from its tip.
- Check the transmission fluid level and colour; burnt fluid can point to internal damage.
How to fix it
- Clean or replace the sensor and renew the O-ring.
- Repair the wiring/connector.
- Change the transmission fluid and filter.
- Reset the TCM adaptations and do a road test.
Manufacturer-specific meanings
The same code can mean something different on some makes.
- Kia: Input Shaft Speed Sensor Error
- Kia: Input/Turbine Speed Sensor Circuit Malfunction
Related codes
- P0714Transmission Fluid Temperature Sensor 'A' Circuit Intermittent
- P0716Input/Turbine Speed Sensor 'A' Circuit Range/Performance
- P0713Transmission Fluid Temperature Sensor 'A' Circuit High
- P0717Input/Turbine Speed Sensor 'A' Circuit No Signal
- P0712Transmission Fluid Temperature Sensor 'A' Circuit Low
- P0718Input/Turbine Speed Sensor 'A' Circuit Intermittent
Look up another code
This page is general information; an exact diagnosis needs measurements and a technician’s check.