Transmission Fluid Temperature Sensor "B" Circuit Range/Performance
Code P2741 indicates the transmission fluid temperature sensor B circuit is reporting a value outside the expected range or is not performing properly. The PCM uses this sensor to monitor transmission fluid temperature and adjust shift timing and torque converter operation accordingly. A faulty sensor, wiring issue, or internal transmission problem can trigger this code.
What You Might Notice
- Check engine light illuminated
- Harsh or delayed gear shifts
- Improper torque converter clutch operation
- Transmission slipping or erratic behavior
- Reduced fuel economy
Most Common Causes
- 1
Faulty transmission fluid temperature sensor
The sensor may be failing, reading inaccurate values, or have internal circuit damage. This is the most common cause of this code.
- 2
Wiring or connector issues
Corroded, loose, or damaged wiring harness connections to the sensor can cause signal problems. Check for water intrusion or corrosion at the connector.
- 3
Internal transmission problems
Low or degraded transmission fluid, internal blockages, or sensor mounting issues within the transmission can prevent proper sensor operation.
- 4
Faulty PCM or module
A malfunctioning powertrain control module or transmission control module may misinterpret sensor signals or fail to communicate properly with the sensor circuit.
How to Diagnose It
- 1
Check Faulty transmission fluid temperature sensor — The sensor may be failing, reading inaccurate values, or have internal circuit damage. This is the most common cause of this code.
- 2
Check Wiring or connector issues — Corroded, loose, or damaged wiring harness connections to the sensor can cause signal problems. Check for water intrusion or corrosion at the connector.
- 3
Check Internal transmission problems — Low or degraded transmission fluid, internal blockages, or sensor mounting issues within the transmission can prevent proper sensor operation.
- 4
Check Faulty PCM or module — A malfunctioning powertrain control module or transmission control module may misinterpret sensor signals or fail to communicate properly with the sensor circuit.
How to Fix It
- 1
Replace transmission fluid temperature sensor B
Locate sensor B on the transmission, disconnect the wiring harness, remove the old sensor, and install a new OEM or quality replacement sensor. Refill transmission fluid if necessary and clear the code.
- 2
Inspect and repair wiring harness
Check the sensor wiring for corrosion, damage, or loose connections. Clean corroded connectors with electrical contact cleaner, repair damaged wires, and ensure all connections are tight.
- 3
Check and service transmission fluid
Verify transmission fluid level and condition. Low or burnt fluid can cause sensor performance issues. Perform a fluid change if the fluid is dark, burnt-smelling, or contaminated.
- 4
Diagnose PCM or transmission module
If sensor and wiring are confirmed good, use diagnostic software to test PCM communication and module function. A faulty module may require reprogramming or replacement.
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