P1740 — Torque Converter Clutch Inductive Signature Malfunction

What Does P1740 Mean?

P1740 is a manufacturer-specific diagnostic trouble code: Torque Converter Clutch Inductive Signature Malfunction. This code applies to OTHER, MAZDA, BUICK, CADILLAC, CHEVY vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1740

⚠️ Check Engine Light (MIL) illuminated
⚠️ Torque Converter Clutch Inductive Signature not operating correctly
⚠️ Related system in reduced functionality mode
⚠️ Reduced engine performance

Common Causes

🔍 Torque Converter Clutch Inductive Signature has failed or is degraded
🔍 Wiring or connector issue in Torque Converter Clutch Inductive Signature circuit
🔍 Related mechanical component affecting Torque Converter Clutch Inductive Signature
🔍 Software update needed for ECM/PCM

Frequently Asked Questions

What does P1740 mean?

P1740 indicates: Torque Converter Clutch Inductive Signature Malfunction. The vehicle's computer has detected that the Torque Converter Clutch Inductive Signature is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1740?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1740 for extended periods may cause additional problems.

How much does it cost to fix P1740?

Repair costs for P1740 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.

Reported Repair Costs for P1740

Based on 3 owner-reported repair costs from NHTSA complaints.

Low End

$300

Typical

$360

High End

$3000

⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.

What To Do Next

Possible Fixes

🔧 Inspect Torque Converter Clutch Inductive Signature and related wiring
🔧 Replace faulty Torque Converter Clutch Inductive Signature

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1740: Torque Converter Clutch Inductive Signature Malfunction