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Home / DTC / P077E — Fluid temperature measurement system of sensor transmission correlation

P077E — Fluid temperature measurement system of sensor transmission correlation

Detailed page for trouble code P077E.

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Code

P077E

LAND ROVER P — Powertrain

Fluid temperature measurement system of sensor transmission correlation

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty transmission fluid temperature sensor (NTC or thermistor)
  • Damaged/poor connector or wiring (open, short to power/ground, high resistance)
  • Poor ground at transmission/TCM
  • Intermittent or corrupted CAN/communication between sensor and TCM/ECM
  • Incorrect transmission fluid level or severely degraded fluid affecting sensor reading
  • Failed or mis-programmed TCM/ECM software

Symptoms

  • Malfunction indicator lamp (MIL) or transmission fault light illuminated
  • Transmission may enter limp/limitation mode or reduced shift quality
  • Erratic shift behavior, late/harsh shifts, or torque converter lockup issues
  • Incorrect temperature readout in scan tool or dash (too high, too low, or erratic)
  • Diagnostic trouble codes related to transmission temperature or communication

What to check

  • Read all stored and pending DTCs plus freeze frame and live data with a capable scan tool
  • Inspect transmission fluid level and condition (color, smell, contamination) but do not rely solely on fluid to diagnose sensor/circuit faults
  • Visually inspect sensor connector and wiring for corrosion, damage, pin push-out, or moisture
  • Backprobe sensor connector and measure signal, power and ground with ignition on and engine at known temperatures
  • Compare transmission fluid temperature reported by TCM with engine coolant temperature/other available temperature sensors using live data
  • Check for communication errors on CAN or module faults in scanner (bus errors, module not responding)

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance varies with temperature)
  • Expected signal: analog voltage signal within 0.2–4.8 V range proportional to temperature (varies by vehicle) or direct CAN message reporting °C/°F
  • Reference: sensor should have stable, monotonic change in voltage/resistance with temperature (no sudden jumps)
  • Communication: TCM/ECM receives temperature data over dedicated signal/analog line or CAN; compare module-reported temps for correlation

Diagnostic algorithm

  1. Retrieve all DTCs, freeze frame, and live data. Record transmission and engine temperature readings and any communication faults.
  2. Verify transmission fluid level and condition; correct level if required and re-check codes (do not overfill).
  3. Visually inspect the transmission temperature sensor connector and wiring harness for damage, corrosion, or water ingress. Repair as needed.
  4. With a multimeter/scan tool, backprobe the sensor connector: verify reference power (if applicable), ground integrity, and sensor signal voltage/resistance at ambient temperature. Compare to expected behavior (signal should change smoothly when temperature changes).
  5. Warm the transmission (short idle or low-load drive) while monitoring sensor voltage and reported temperature; confirm the signal changes in a consistent manner and compare TCM/ECM readings for correlation.
  6. Perform wiggle test on wiring harness while monitoring live data to detect intermittent opens/shorts.
  7. If wiring and connector are good but readings are incorrect, replace the transmission fluid temperature sensor and retest.
  8. If fault persists after sensor replacement, check module grounds, CAN bus integrity, and scan for other module faults. Use manufacturer's wiring diagrams to isolate the circuit and perform pin-to-pin checks.
  9. If communication or module faults are found, update TCM/ECM software per manufacturer TSBs and reprogram if required. Replace the TCM only after confirming wiring and sensor are good and following manufacturer guidance.
  10. Clear codes and perform a road/functional test to confirm repair and monitor for reappearance of P077E.

Likely causes

  • Corroded/loose sensor connector or damaged harness
  • Failed transmission fluid temperature sensor
  • Poor ground at transmission or TCM
  • Communication fault (CAN) between modules

Fault status

⚠️ Status
Transmission fluid temperature sensor correlation fault — sensor readings do not match expected/compare reference(s) or communication error between sensor and control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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