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DTC codes / P27xx · Transmission / P274B
P274B indicates that the transmission control module has detected an out-of-range or performance fault in the circuit for Transmission Fluid Temperature Sensor C, which is one of several temperature sensors used to monitor automatic transmission fluid temperature. The computer compares the sensor C signal against expected values and other temperature sensors, and it sets this code when the signal is not plausible, erratic, or stuck within a range that does not match actual operating conditions.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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