Can I drive with P0740?

Yes, you can generally drive with P0740, but you should get it fixed within 14 days.

How much does it cost to fix P0740?

The typical repair cost for P0740 ranges from $100 to $1200, depending on the root cause and whether you go to a dealership or independent shop.

Can I fix P0740 myself?

This repair is rated as "advanced" difficulty. This repair is best left to a professional mechanic.

The most common causes of P0740 include: Failed TCC solenoid, Wiring issue, Worn TCC clutch. Check the diagnostic steps above for a systematic approach to identifying the root cause.

P0740 is rated as "moderate" severity. This is a moderate issue. You can usually drive short distances but should fix it within 30 days.

SAE Standard Definition

P0740

Torque Converter Clutch (TCC) Circuit Malfunction

The torque converter clutch solenoid circuit has a malfunction.

Moderate

Safe to drive advanced Fix within 14 days

Estimated Cost (USD)$100 - $1,200

BudgetMajor

Estimated Labor~2 hours

The TCC locks the torque converter at highway speeds for fuel efficiency. This code sets when the TCM detects an electrical problem in the TCC solenoid circuit, preventing proper lockup.

Symptoms

Check Engine Light on

Reduced fuel economy at highway speed

Slight shudder or vibration during TCC lockup

Transmission overheating

Common Causes

Failed TCC solenoid

HIGH

The solenoid has failed electrically.

Wiring issue

MEDIUM

Damaged wires between TCM and solenoid.

Worn TCC clutch

MEDIUM

The lockup clutch material is worn out.

Step-by-Step Diagnosis

Check solenoid resistance

medium

Measure TCC solenoid resistance. Typical range: 10-25Ω. Out of range = replace.

Tools:Multimeter

Check wiring to solenoid

hard

Verify power and ground to the TCC solenoid connector inside the transmission.

Tools:MultimeterWiring diagram

Replace TCC solenoid

hard

Requires dropping the transmission pan. Replace solenoid and filter.

Tools:Socket setDrain panNew solenoid

Frequently Asked Questions

Summary

Category: Powertrain
System: Transmission
Cost Range: $100 - $1,200

Disclaimer

The information on this page is provided for general educational and reference purposes only. ErrorCodes is not a substitute for professional automotive diagnosis or repair. Diagnostic trouble codes indicate areas for further investigation and do not definitively identify the failed component. The same code can have different causes depending on your specific vehicle, its history, and conditions. Always consult a qualified, certified mechanic before performing repairs. ErrorCodes assumes no liability for any repairs made based on information found on this site.