P0715
Transmission Fluid Temperature Sensor Circuit Intermittent
Powertrain Transmission Control TFT Sensor Circuit 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

Your transmission's temperature sensor is sending inconsistent signals to the computer, like a loose connection that keeps cutting in and out. The ECU can't reliably monitor how hot the transmission fluid is, which affects shift quality and protection.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Rough or delayed gear shifts
Transmission overheating warning or limp mode
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors voltage signals from the transmission fluid temperature (TFT) sensor to adjust shift timing and pressure. The sensor should produce a steady voltage signal that changes smoothly with temperature. An intermittent circuit means the signal drops out or becomes erratic, triggering a fault detection.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor Voltage Signal 0.5–4.5V (continuous, smooth change) Signal dropouts, spikes, or noise exceeding acceptable variance
Temperature Range –40°C to 130°C (–40°F to 266°F) Implausible readings or signal loss during operation
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Electrical connector at TFT sensor
Clean the connector pins and reseat it firmly; corrosion or loose contacts are the most common cause.
2
Wiring harness to sensor
Inspect for pinched, cracked, or damaged insulation along the entire harness run; repair or replace as needed.
3
Transmission Fluid Temperature Sensor
If connector and wiring are sound, replace the sensor itself; they fail internally and cause intermittent faults.