P0715: Input/Turbine Speed Sensor A Circuit Malfunction
The P0715 code indicates a malfunction in the input/turbine speed sensor (also known as the transmission speed sensor) circuit. This sensor monitors the rotational speed of the torque converter turbine (input shaft) and sends this data to the transmission control module (TCM) to manage shift timing and torque converter lockup. A circuit malfunction can be due to a faulty sensor, damaged wiring, or a problem with the TCM. This code often leads to erratic shifting, poor fuel economy, and potential transmission damage if ignored.
01. Most Common Causes
- Faulty input/turbine speed sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Low transmission fluid level or contaminated fluid
- Internal transmission mechanical failure
- Faulty transmission control module (TCM)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Erratic or harsh shifting
- Transmission slipping or delayed engagement
- Poor acceleration or reduced fuel economy
- Transmission stuck in limp mode or a single gear
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data. Check for additional transmission-related codes.
Step 2: Inspect transmission fluid level and condition. Low or burnt fluid can cause sensor issues.
Step 3: Visually inspect the sensor and its wiring harness for damage, corrosion, or loose connections.
Step 4: Test the sensor resistance and voltage output using a multimeter. Compare with manufacturer specifications.
Step 5: If sensor and wiring are okay, test the TCM for proper signal reception. Replace TCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with P0715, as it can cause erratic shifting and potential transmission damage. If you must drive, keep speeds low and avoid heavy acceleration. Have the vehicle inspected as soon as possible.
How much does it cost to fix?▼
The cost to fix P0715 typically ranges from $50 to $150 for a sensor replacement if DIY, or $150 to $400 at a shop including labor. Additional costs may apply if wiring repairs or TCM replacement is needed.