P0714
Transmission Fluid Temperature Sensor Circuit High Input
Powertrain Transmission Control Temp Sensor High 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

Your transmission fluid temperature sensor is sending a signal that's too high, like a broken thermometer that always reads 'boiling hot.' The ECU thinks the fluid is hotter than it actually is, which can cause transmission shifting problems.

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

The ECU monitors voltage from the transmission fluid temperature sensor, which should decrease as fluid temperature increases. A high input voltage means the ECU detects an abnormally cold signal, indicating either a sensor failure, open circuit, or wiring issue. When voltage exceeds the maximum threshold, the fault code triggers.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor Voltage 0.5-4.5V (proportional to fluid temp) >4.5V or open circuit condition
Fluid Temperature Signal -40°C to +150°C range Signal reads below minimum valid range
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Transmission fluid temperature sensor connector
Inspect and reseat the connector at the sensor; corrosion or loose pins often cause high-input faults.
2
Transmission fluid temperature sensor wiring harness
Check for damaged insulation, loose connections, or corrosion in the wiring between sensor and ECU.
3
Transmission fluid temperature sensor
Replace the sensor if voltage remains high after checking connections; internal failure is common.