Transmission Torque Converter Clutch Circuit Malfunction (Ford)
What does P1719 mean?
The P1719 code means the vehicle's onboard diagnostic system has detected: Transmission Torque Converter Clutch Circuit Malfunction (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Torque converter not locking up on highway
- Shudder or vibration at highway speeds
- Poor fuel economy
- Transmission fluid overheating
Probable Causes (Ranked by Likelihood)
- Faulty TCC solenoid Very High
- Worn torque converter clutch material High
- TCC solenoid wiring fault Moderate
- PCM TCC driver circuit failure Low
Step-by-Step Diagnostic Procedure
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Monitor TCC status on a scan tool at highway speed. It should engage above 40-50 MPH in top gear.
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Measure TCC solenoid resistance at the transmission connector (typically 10-20 ohms).
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Command TCC engagement with a scan tool and check for RPM drop indicating lockup.
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If the solenoid tests good but lockup does not occur, the torque converter clutch material is worn.
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Check for related TFT and brake switch codes that can prevent TCC engagement.
Frequently Asked Questions
What is torque converter lockup?
Lockup mechanically connects the engine to the transmission through the torque converter clutch, eliminating slippage for better fuel economy and lower fluid temperatures at highway speed.
Why does my truck shudder at highway speed?
A worn TCC clutch can cause shudder when it tries to engage. The clutch material slips and grabs repeatedly, causing a noticeable vibration.
Can a TCC solenoid be replaced without removing the transmission?
The solenoid is in the valve body and can be accessed by removing the pan. However, if the torque converter clutch itself is worn, the transmission must be removed to replace the converter.