P2740 — Transmission Fluid Temperature Sensor B Circuit

What Does P2740 Mean?

P2740 is a diagnostic trouble code indicating: Transmission Fluid Temperature Sensor B Circuit. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P2740

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Transmission Fluid Temperature Sensor B readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Transmission Fluid Temperature Sensor B circuit (damaged, chafed, or corroded)
🔍 Faulty Transmission Fluid Temperature Sensor B connector or terminal
🔍 Failed Transmission Fluid Temperature Sensor B
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P2740 mean?

P2740 indicates: Transmission Fluid Temperature Sensor B Circuit. The vehicle's computer has detected that the Transmission Fluid Temperature Sensor B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P2740?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P2740 for extended periods may cause additional problems.

How much does it cost to fix P2740?

Repair costs for P2740 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Transmission Fluid Temperature Sensor B wiring and connectors
🔧 Replace faulty Transmission Fluid Temperature Sensor B

1
Find your vehicle above
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2
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P2740: Transmission Fluid Temperature Sensor B Circuit