P2770 Fault Code

Torque Converter Clutch Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2770 fault code refers to an issue with the Torque Converter Clutch (TCC) circuit, indicating that there is a high voltage or resistance detected within the circuit. This can affect the operation of the torque converter, which is essential for smooth vehicle acceleration and deceleration.

• Torque Converter: A component that allows for the smooth transfer of power from the engine to the transmission.
• Clutch Circuit: Part of the system that engages and disengages the torque converter, providing direct engine coupling at cruising speeds.
• High Voltage: Suggests a potential electrical issue, usually indicating that the TCC is not responding correctly due to excessive voltage.

What are the symptoms of the P2770 code?

When experiencing a P2770 code, the following symptoms may occur:

• Unusual engine revving or an increased engine RPM while driving at a constant speed.
• Stalling or harsh shifting during drive or reverse.
• Poor fuel economy due to improper engagement of the torque converter.
• Check Engine Light illuminated on the dashboard, indicating a fault has been detected.

What causes the P2770 code?

Several factors can contribute to a P2770 fault code, including:

• Faulty TCC solenoid, which controls the engagement of the torque converter clutch.
• Wiring issues such as short circuits, damaged connectors, or frayed wires in the TCC circuit.
• Faulty transmission control module (TCM) that may incorrectly interpret the status of the TCC.
• Overheating of transmission fluid leading to poor performance of the torque converter.

How to fix P2770?

To resolve a P2770 fault code, consider the following steps:

• Inspect and test the TCC solenoid for proper function; replace if faulty.
• Check the wiring and connections in the TCC circuit for any signs of damage or corrosion.
• Perform a transmission fluid change if fluid is found to be burnt or contaminated.
• If necessary, reprogram or replace the transmission control module based on diagnostic requirements.
• Always check for any other fault codes that might be related to the transmission for comprehensive diagnostics.