P274C

Code

Generic P — Powertrain

Transmission Fluid Temperature Sensor C Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 33 RU: 26

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Read freeze frame and live data for TFT Sensor C value and related transmission data
Confirm battery voltage is normal and charging system is healthy
Visually inspect sensor connector and wiring for corrosion, damage, or pin intrusion
Backprobe sensor connector and measure signal voltage with key ON, engine OFF
Measure sensor resistance (if removable) and compare to specification
Perform continuity checks for short to ground and open circuits between sensor and TCM

Typical TFT sensor circuit behavior: variable voltage or resistance representing temperature (varies by vehicle).
Low-circuit indication often = signal voltage very low (
High/open circuit indication typically = very high voltage (>4.5 V) or very high/infinite resistance.
Expected normal operating range (example only): 0.5–4.5 V depending on temperature; consult OEM spec for exact values.

Retrieve stored codes and freeze-frame. Note conditions when code set (temp, key/engine state, vehicle speed).
Verify battery voltage and grounds. Low system voltage can cause false readings.
Visually inspect the TFT Sensor C connector, pins, and harness along its routed path for damage, corrosion, or chafing. Repair any obvious issues.
Backprobe the sensor connector with key ON (engine OFF). Measure signal voltage relative to ground. A very low voltage suggests a short to ground.
With sensor disconnected, measure continuity between the sensor signal pin and chassis ground. If near 0 ohms, wiring is shorted to ground and must be repaired.
Measure sensor resistance (if serviceable) across sensor terminals at known ambient temp and compare to OEM spec. Replace sensor if resistance indicates internal short.
If wiring and sensor check OK, backprobe at the TCM/PCM connector to confirm the module input is not shorted. If short present at module, inspect for poor terminal, harness pin issue, or module fault.
Repair or replace wiring, connector(s), or sensor as diagnosed. Use proper crimping, sealing and routing practices.
Clear codes, perform functional test and test drive while monitoring TFT Sensor C live data to confirm fault does not return.
If fault returns and wiring/sensor verified good, consult OEM wiring diagrams and consider module testing/replacement or professional assistance.