P275D

Code

Generic P — Powertrain

Transmission Fluid Temperature Sensor D Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 39 RU: 28

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Page language: EN

Causes

Open circuit in TFT sensor D wiring (broken wire, connector pin out)
Short to battery/5V or other high voltage source in the sensor D circuit
Corroded, contaminated or loose connector at the sensor or PCM
Failed TFT sensor (thermistor)
Poor or missing ground or reference from PCM
PCM input fault (rare)

Symptoms

MIL/Check Engine light illuminated
Stored and active transmission temperature circuit fault
Incorrect transmission shift behavior or limp-home mode (if PCM uses TFT for shifting strategy)
Transmission overheating warnings or abnormal temperature PID reading (very high or implausible)
Poor shifting, harsh or delayed shifts (in some vehicles)

What to check

Read and record freeze‑frame data and live PID for transmission temperature and related PIDs
Visually inspect sensor D connector, wiring harness, and PCM connector for corrosion, damage, water intrusion or loose terminals
Check for other related codes (other TFT sensors or communication faults)
Backprobe sensor connector with ignition ON (engine off) and measure sensor circuit voltage and reference/ground
Measure resistance of the TFT sensor at the connector with sensor disconnected (compare to specification if available)
Perform continuity check from sensor pin to PCM pin and check for short to battery (5V) or short to ground

Signal parameters

Sensor type: usually a 2‑wire NTC thermistor (resistance falls as temperature rises) — manufacturer specific
Typical operating signal: 0–5 V (PCM measures voltage across thermistor). Normal in‑range values vary by vehicle; many PCMs treat >4.5 V (or open/infinite resistance) as a high/fault condition
Open circuit condition: near battery voltage at sensor circuit or infinite resistance when measured with multimeter
Typical resistance example (manufacturer specific): around 10 kΩ at ~25 °C is common; consult OEM spec for exact values

Diagnostic algorithm

Retrieve freeze frame and any additional transmission or temperature codes. Note conditions when code set (cold/hot, engine running/idle).
Visually inspect sensor D connector and wiring for damage, corrosion, fluid ingress, bent pins, or loose terminals. Repair any obvious problems.
With ignition ON (engine OFF), backprobe sensor signal and ground pins: verify reference voltage from PCM (if applicable) and measure signal voltage. A signal >4.5 V or near battery voltage indicates high/open. Verify PCM ground continuity.
With sensor disconnected measure sensor resistance across its terminals at ambient temp. Compare to OEM spec or expected NTC behavior. An open or very high reading indicates a failed sensor.
Check continuity from the sensor connector to the PCM connector; check for short to battery (5V) and short to ground. Repair any wiring faults or shorts.
If wiring and connectors are good and sensor resistance is out of spec, replace the TFT sensor D. If sensor tests good but voltage at PCM is still high, suspect PCM input or internal short — consult manufacturer procedures.
After repair, clear codes, perform a road or operational test to verify the fault does not return and confirm TFT PID reports reasonable temperatures for operating conditions.

Likely causes

Broken or chafed wiring between sensor D and PCM
Corroded/loose connector at the sensor or harness splice
Failed TFT sensor element (open or very high resistance)

Fault status

⚠️ Status

PCM detected high voltage/open condition on Transmission Fluid Temperature Sensor D circuit. Indicates sensor circuit voltage above threshold or open/high‑resistance; possible causes include open wiring, short to battery/5V, corroded connector, or failed sensor.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours