P0715 medium Severity

P0715: Input/Turbine Speed Sensor A Circuit Malfunction

May cause transmission shift issues, limp/fail-safe mode, or erratic gear engagement

Overview

P0715 indicates a malfunction detected by the PCM/TCM in the input/turbine speed sensor circuit often due to wiring, sensor failure, or transmission issues

Common Symptoms

  • Check Engine Light illuminated
  • Harsh or erratic transmission shifting
  • Limp mode activation
  • Reduced fuel efficiency
  • Incorrect speedometer/odometer readings

Most Common Causes

Faulty input/turbine speed sensor high

Sensor fails to provide valid RPM signal to PCM/TCM

Damaged or corroded sensor wiring/connectors high

Electrical circuit continuity issues can trigger the code

Broken or damaged reluctor ring/shaft on transmission input medium

Physical damage can disrupt signal generation

Faulty Transmission Control Module (TCM)/PCM low

Internal module issues can misinterpret or fail to receive signals

Contaminated or low transmission fluid affecting sensor operation low

Fluid conditions can indirectly affect circuit readings

Diagnostic Steps

  1. Connect OBD-II scanner and confirm P0715 code with freeze frame data
    Expected: P0715 present without unrelated codes
    Interpretation: Confirms primary issue with input speed circuit
  2. Visually inspect input/turbine speed sensor and wiring harness for damage, corrosion, or loose connections
    Expected: No damaged wires, connectors clean and intact
    Interpretation: Problems here likely cause of code
  3. Measure sensor resistance and voltage with multimeter per OEM specs
    Expected: Resistance/voltage within manufacturer specifications
    Interpretation: Out-of-spec readings indicate failed sensor
  4. Inspect reluctor ring/shaft near sensor for physical damage or missing teeth
    Expected: Reluctor ring intact with uniform teeth
    Interpretation: Physical damage can disrupt accurate signal
  5. If sensor and wiring appear functional, test PCM/TCM signal reception and consider scanning live input/output RPM data
    Expected: Consistent RPM signal matches actual vehicle speed
    Interpretation: Mismatch suggests module or deeper transmission faults

Repair Solutions

Replace input/turbine speed sensor medium
Estimated Cost: $100 - $300

Common and often necessary if sensor fails diagnostic tests

Repair or replace damaged wiring/connectors medium
Estimated Cost: $90 - $500

Costs vary depending on extent of harness damage

Replace reluctor ring/shaft hard
Estimated Cost: $300 - $900

Requires internal access to transmission components

Repair or replace PCM/TCM hard
Estimated Cost: $500 - $1500

Only after ruling out sensor and wiring faults

Transmission fluid service (clean/refill) easy
Estimated Cost: $80 - $200

Useful when fluid contamination contributes to issues

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Faulty output speed sensor instead of input sensor
  • Internal transmission mechanical fault
  • General engine misfire misinterpreted as sensor issue

Frequently Asked Questions

Technical definition of P0715 OBD-II Code

The P0715 code stands for Input/Turbine Speed Sensor A Circuit Malfunction. This generally indicates an issue with the Sensors system.

Should I stop driving if I have P0715?

With a severity level of medium, may cause transmission shift issues, limp/fail-safe mode, or erratic gear engagement

What happens when the P0715 code is active?

Common symptoms include: Check Engine Light illuminated, Harsh or erratic transmission shifting, Limp mode activation. You might also notice the Check Engine Light is on.

Potential causes for OBDII code P0715

This code is frequently triggered by: Faulty input/turbine speed sensor, Damaged or corroded sensor wiring/connectors, Broken or damaged reluctor ring/shaft on transmission input.

What is the price difference for fixing P0715?

Repair costs depend on the specific failure. A simple Transmission fluid service (clean/refill) replacement is relatively affordable ($80-$200), whereas a Repair or replace PCM/TCM repair is more expensive, potentially reaching $1500.

Is P0715 a generic or manufacturer-specific code?

This is a universal code. You might see P0715 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

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