P0714

Code

Generic P — Powertrain

Transmission Fluid Temperature Sensor A Circuit Intermittent

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 40 RU: 33

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Read and record freeze frame and live data for TFT sensor A and related PIDs
Perform a visual inspection of sensor, connector, and wiring for damage, corrosion, or oil intrusion
Wiggle test wiring and connector while monitoring live sensor data for intermittent changes
Check for related transmission codes and vehicle symptoms
Backprobe connector to verify reference voltage, signal, and ground continuity
Compare sensor resistance or voltage to OEM specifications (refer to service manual)

Most TFT sensors are thermistor-type (NTC) or voltage-output; behavior varies by vehicle
Typical thermistor behavior: resistance decreases as temperature rises (verify OEM chart)
Expected idle signal voltage/resistance varies — consult vehicle-specific specs
Intermittent fault: signal may flicker, jump to open-circuit value, or briefly go to battery voltage
Useful checks: steady, smooth change in temperature reading during warm-up; sudden drops/spikes indicate intermittent

Retrieve freeze frame, pending codes, and live PID data for transmission temperature. Note conditions when fault set (engine temp, load, vehicle speed).
Visually inspect sensor A connector and wiring at the transmission for corrosion, oil contamination, chafing, or broken wires. Repair damage found.
With ignition on (engine off), backprobe connector and verify reference voltage (if present), signal circuit behavior, and ground continuity to PCM. Compare to vehicle manual values.
Start engine and monitor TFT A value while warming up. Perform a wiggle test of harness and connector; watch for intermittent changes or DTC recreation.
Measure sensor resistance (or voltage output) at two known temperatures (cold and warm). Compare to OEM resistance/voltage vs. temperature chart. If values are erratic or out of spec, suspect the sensor.
If wiring checks suspect intermittent short/open, perform continuity tests with harness moved/strained and inspect for pins that change state. Repair or replace wiring/connector as needed.
If wiring and connector are good but readings are intermittent, replace the TFT Sensor A and re-test.
If problem persists after sensor and harness replacement, inspect ground circuits and power feeds to PCM/TCM. If all vehicle wiring is good, consider PCM/TCM diagnosis as a last step.
After repairs, clear codes and perform a road test under the conditions that previously produced the fault to verify repair.