P0740: Torque Converter Clutch Circuit/Open
What Does P0740 Mean?
P0740 is a diagnostic trouble code indicating: Torque Converter Clutch Circuit/Open. This code relates to the transmission system. It has been reported in NHTSA complaints across 6 different vehicle models.
The automatic transmission is controlled by the TCM using input from speed sensors, temperature sensors, and pressure sensors. When the TCM detects a fault, it may activate limp mode (2nd or 3rd gear only). Shift solenoids are electromagnetic valves inside the valve body controlling hydraulic fluid flow. Modern transmissions use 4-8 solenoids in combination for each gear. Solenoid failures are often caused by contaminated fluid — worn clutch material and degraded fluid create varnish that sticks solenoids. Always check transmission fluid first: level, color (red/pink good, brown/black bad), and smell (burnt = internal damage). Transmission DTCs escalate fast — a $200 solenoid fix can become a $3000-$5000 rebuild if ignored.
Symptoms of P0740
- ⚠️ Check engine/transmission warning light on
- ⚠️ Harsh, delayed, or erratic shifting
- ⚠️ Transmission stuck in one gear (limp mode)
- ⚠️ No upshift or no downshift
- ⚠️ Transmission slipping
- ⚠️ RPM flares between shifts
Common Causes
- 🔍 Faulty shift solenoid
- 🔍 Contaminated transmission fluid
- 🔍 Wiring issue between TCM and solenoid
- 🔍 Valve body wear
- 🔍 TCM internal failure
P0740 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"1)The following components failed:Symptoms and Diagnostic Trouble Codes TRANSMISSION P0741 - Torque Converter Clutch Circuit Performance/Stuck Off P2757 - Torque Converter Clutch Pressure Control Solenoid Control Circuit Performance/Stuck Off P2714 - Pressure Control Solenoid 'D' Performance/Stuck O"
— Toyota Highlander owner, 09/27/2025
"Vehicle experienced sudden loss of power and severe hesitation from a stop. Acceleration is extremely weak from approximately 0–20 mph, then returns to normal once moving. Traction control system automatically disables itself and check engine light illuminates. Vehicle feels unsafe when pulling into"
— Toyota Highlander owner, 01/22/2026
"INTERMITTENT LOSS OF 1ST GEAR/TRUCK STARTS IN 2 OR 3RD GEAR/INTERMITTENT TROUBLE CODES P0758 AND P0740 THEN CODES CLEAR/EXTREMELY DANGEROUS WHEN MOVING INTO TRAFFIC FROM A STOP/ DON'T KNOW WHEN TRUCK WILL STALL OR FAIL TO PICK UP SPEED/TRANSMISSION SHOPS SAY CAN'T HELP UNTIL CODES ARE SET/EMAILED CH"
— Chevrolet Silverado owner, 01/14/2016
Source: NHTSA Complaints Database
Most Reported Vehicles for P0740
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | TOYOTA HIGHLANDER | |
| 2 | CHEVROLET SILVERADO | |
| 3 | NISSAN VERSA | |
| 4 | DODGE JOURNEY | |
| 5 | DODGE NITRO | |
| 6 | CHRYSLER PACIFICA |
P0740 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Diagnostic Tips
- Check fluid level and condition FIRST
- Multiple codes suggest valve body or internal damage
- Monitor solenoid duty cycle with scan tool
- Solenoids often accessible by removing pan
Common Mistakes to Avoid
- ❌ Replacing solenoid without flushing contaminated fluid
- ❌ Using aftermarket fluid instead of manufacturer-specified
- ❌ Driving in limp mode for extended periods
Frequently Asked Questions
What is a shift solenoid?
Can I drive in limp mode?
How much for solenoid replacement?
Can fluid change fix it?
What To Do Next
Possible Fixes
- 🔧 Replace shift solenoid or pack
- 🔧 Transmission fluid flush with manufacturer fluid
- 🔧 Repair wiring to transmission
- 🔧 Replace valve body
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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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.