P0715 serious

Input/Turbine Speed Sensor Circuit Malfunction

The P0715 code means the vehicle's onboard diagnostic system has detected: Input/Turbine Speed Sensor Circuit Malfunction. This is a serious severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: medium
Estimated cost: $20-$80 for speed sensor; $100-$200 labor

Check Your Fluid First

ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

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Read Transmission Codes

LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

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Common Symptoms

Harsh or erratic transmission shifting
Transmission stuck in one gear
Check Engine Light on
Speedometer may be affected

Probable Causes (Ranked by Likelihood)

Failed input shaft speed sensor Very High
Damaged wiring or connector at input speed sensor Moderate
Metal debris on sensor tip (from transmission wear) Moderate

Step-by-Step Diagnostic Procedure

Monitor input shaft speed on a scan tool. At idle in drive with brakes applied, input speed should be near zero. Erratic readings indicate sensor or wiring issues.
Test sensor resistance: 200-900 ohms for magnetic sensors.
Remove the sensor and inspect the tip for metal shavings. Contamination can cause erratic readings.
Inspect sensor wiring harness for damage at the transmission connector.

Common Fixes by Vehicle

What techs usually find when diagnosing P0715 on specific vehicles — tap your vehicle for the fix and the exact part:

2003-2015 Nissan Altima/Maxima CVT Moderate DIY

The input speed sensor (turbine speed sensor) on Nissan CVTs fails from heat and ATF contamination. Located on the transmission housing, it is accessible from under the car. Replace with Nissan OEM 31935-1XF01. Drain some CVT fluid first to reduce spillage during sensor removal.

Labor: 0.5-1 hour

Common fix part Nissan CVT Input Speed Sensor View on Amazon→ Compare fitment at PartsGeek→

2001-2011 Honda Accord/Civic Automatic Easy DIY

The mainshaft (input) speed sensor on Honda automatics develops cracked housings that allow fluid to reach the connector. Check for ATF in the electrical connector. Replace the sensor with Dorman 917-673 and clean the connector. The sensor is on the top of the transmission, accessible from the engine bay.

Labor: 0.5-1 hour

Common fix part Dorman Input Speed Sensor Honda View on Amazon→ Compare fitment at PartsGeek→

2007-2017 Jeep Wrangler/Grand Cherokee 42RLE/545RFE Moderate DIY

The input speed sensor on Chrysler transmissions fails from internal seal degradation. ATF leaks past the sensor O-ring. Replace the sensor and the O-ring together. Located on the driver side of the transmission. Use Mopar 4800878AA for correct fitment. Torque to 105 in-lbs.

Labor: 0.5-1 hour

Common fix part Mopar Input Speed Sensor View on Amazon→ Compare fitment at PartsGeek→

Frequently Asked Questions

What does the input speed sensor do?

The input (turbine) speed sensor measures the rotational speed of the torque converter turbine, which is the input shaft of the transmission. The TCM uses this to determine slip, torque converter lockup timing, and shift points.