P0715 - Input/Turbine Speed Sensor A Circuit Malfunction
The P0715 code indicates a malfunction in the input/turbine speed sensor circuit, which monitors the rotational speed of the transmission's input shaft (torque converter turbine). This sensor is critical for the transmission control module (TCM) to determine shift timing, line pressure, and torque converter lockup. A faulty circuit can cause erratic shifting, slipping, or limp mode.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or harsh shifting
- Transmission slipping or delayed engagement
- Reduced fuel economy
2. Most Common Causes
- Faulty input/turbine speed sensor
- Damaged wiring or connector issues
- Low transmission fluid level or contaminated fluid
- Internal transmission mechanical failure
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition.
Step 3: Visually check sensor wiring and connector for damage or corrosion.
Step 4: Test sensor resistance and voltage with a multimeter per manufacturer specs.
Step 5: If sensor and wiring are OK, check for internal transmission issues.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause transmission damage. Limp mode may limit speed and shifting.
How much does it cost to fix?▼
Replacing the sensor typically costs $150-$400 including parts and labor. If internal damage is found, costs can exceed $2000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.