P2740

Transmission Fluid Temperature Sensor B Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine Light Is On
The gearbox goes into emergency mode
Unstable gear shifting
Reduced transmission efficiency
Incorrect transmission fluid temperature readings

Causes

Open or short circuit in the sensor circuit
Transmission Fluid Temperature Sensor B Malfunction
Poor contact in the sensor connector
Wiring harness damage
Transmission control module (TCM) malfunction

How to Fix

Check the integrity of the sensor circuit
Check sensor resistance and voltage
Inspect connectors and wiring harness for damage
Replace the transmission fluid temperature sensor if necessary
Check and, if necessary, replace the transmission control unit

Related codes

P2730 P2750 P2760