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Home / DTC / P0714 — Transmission Fluid Temperature Sensor Circuit Intermittent

P0714 — Transmission Fluid Temperature Sensor Circuit Intermittent

Detailed page for trouble code P0714.

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Code

P0714

MERCEDES-BENZ P — Powertrain

Transmission Fluid Temperature Sensor Circuit Intermittent

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
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Page language: EN

Causes

  • Intermittent open or short in sensor wiring or connector (chafing, broken wire, bent terminal)
  • Corroded, loose or contaminated connector at sensor or TCM
  • Faulty transmission fluid temperature sensor (thermistor)
  • Poor ground or reference voltage to sensor
  • Water ingress, dirt or fluid contamination in connector
  • Intermittent TCM/module input fault or internal connector problem

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated with stored P0714
  • Intermittent or harsh shifting, delayed shifts or unusual shift behavior
  • Transmission may enter limp/limitation mode in some cases
  • Incorrect or fluctuating transmission temperature readout (if gauge/data available)
  • Possible related codes for transmission control or speed/temperature sensors

What to check

  • Scan for P0714 and any related transmission/communication codes; record freeze frame/live data
  • Visual inspection of harness and connectors at TFT sensor and TCM for corrosion, damage, contamination or water
  • Wiggle test harness while monitoring live TFT sensor value to reproduce intermittent behavior
  • Check instrument cluster / scan tool live data for TFT voltage/resistance/temperature readings
  • Verify battery/charging system voltage and proper grounds
  • Consult vehicle-specific wiring diagram and TSBs/software updates from manufacturer

Signal parameters

  • Sensor type: typically a temperature thermistor—resistance decreases as fluid temperature increases
  • Typical behavior: voltage or resistance should change smoothly with temperature (no sudden jumps or dropouts)
  • Common voltage range (with pull-up/reference): ~0.5–4.5 V depending on temperature and circuit design (verify OEM spec)
  • Resistance range: varies by sensor design—consult OEM specification for exact ohms vs. temperature curve
  • Expected idle/stable reading: steady value appropriate for current fluid temperature; intermittent code if signal drops out or toggles rapidly

Diagnostic algorithm

  1. Capture codes, freeze frame and live data. Note conditions when P0714 set (temp, driving, after cold start).
  2. Visually inspect TFT sensor connector and wiring at the transmission and at TCM. Look for corrosion, water, broken insulation, pin damage or melted plastic.
  3. Perform wiggle test on harness/connectors while monitoring live TFT reading to try to reproduce intermittent signal.
  4. Back-probe sensor connector with a multimeter or lab scope. Verify reference voltage and ground are present and stable. Watch for voltage dropouts or noise.
  5. Measure sensor resistance with sensor disconnected and with known fluid temperature (or heat/cool sensor while monitoring). Compare trend to expected thermistor behavior (resistance should change smoothly as temperature changes).
  6. Check continuity of wiring between sensor and TCM (resistance, shorts to ground or battery). Repair any high resistance, opens or shorts.
  7. If wiring and connectors are good but signal still intermittent, replace TFT sensor and retest.
  8. If intermittent persists after sensor replacement, inspect/repair harness splices or module connector. Consider testing module input or swapping module only if supported and after confirming wiring and sensor are good.
  9. Clear codes, perform road test and monitor live TFT values and for reappearance of P0714. Re-scan after heat cycles and same conditions that produced the fault.

Likely causes

  • Corroded/loose connector at TFT sensor
  • Broken/chafed wire in harness to transmission
  • Failing TFT sensor (intermittent internal contact)
  • Poor ground or intermittent reference voltage to sensor

Fault status

⚠️ Status
Transmission Fluid Temperature Sensor Circuit Intermittent — intermittent signal detected from the transmission fluid temperature sensor to the transmission control module. May cause incorrect temperature readings and affect transmission operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0713 P0715 P0700 P0720
856

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