P2770 Torque Converter Clutch Circuit High
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P2770 Torque Converter Clutch Circuit High
OBD-II DTC Datasheet
Torque Converter Clutch Circuit High Signal
This Diagnostic Trouble Code (DTC) is a generic OBD-II transmission code. It is considered universal as it applies to all makes and models of cars (1996 and newer), although specific repair steps may differ depending on the model.
What does this mean?
In modern vehicles equipped with automatic / transaxle transmissions, a torque converter is used between the engine and the transmission to increase the engine's output torque and drive the rear wheels.
The engine and transmission are effectively linked by a hydraulic clutch mechanism inside the torque converter, which increases torque until the speeds equalize and create a “stop” speed, where the difference in actual engine rpm and transmission input rpm is about 90%. ... The Torque Converter Clutch (TCC) solenoids, controlled by the Powertrain Control Module / Engine Control Module (PCM / ECM) or Transmission Control Module (TCM), direct hydraulic fluid and engage the torque converter clutch for strong coupling and improved efficiency.
The TCM has detected a malfunction in the circuit that controls the torque converter clutch solenoid. We will be looking at the TCM as the controller for this article, although it can be controlled via the PCM / ECM, refer to the factory wiring diagrams to determine which system is in use.
Note. This code is the same as P0740, P0741, P0742, P0743, P0744 and P2769.
P2770 means the PCM has detected that the TCC circuit is high. There may be other DTCs associated with the transmission control module that can only be accessed with the advanced scan tool. If any additional transmission-related DTCs appear in addition to P2770, there is likely a power failure.
symptoms
Symptoms of a P2770 trouble code may include:
- Malfunction Indicator Lamp (MIL) illuminated (also known as engine warning lamp)
- Minimal reduction in fuel consumption, it will not affect engine performance.
Possible reasons
Reasons for this DTC may include:
- Transmission harness damaged, loose, open or short circuit
- Torque Converter Clutch (TCC) Solenoid
- Transmission control module (TCM)
P2770 Troubleshooting Actions
Wiring – Check transmission harness for damage or loose connections. Use the factory wiring diagram to find the appropriate power source and all connection points between circuits. The transmission can be powered by a fuse or relay and run by the TCM. Disconnect the transmission harness from the transmission connector, power supply and TCM. Check the integrity of the transmission's internal wiring harness by locating the appropriate + and - pins on the torque converter clutch solenoid.
Using a digital volt/ohmmeter (DVOM) set to the ohm scale, check the resistance in the positive and negative circuit at the respective pins. If the resistance is extremely high or above the limit (OL), suspect an internal wiring harness or TCC solenoid failure - removal of the transmission oil pan may be required to further diagnose the TCC solenoid.
Check the wiring between the TCM and the harness connector on the transmission housing using the DVOM set to ohms. Check for a possible ground fault by moving the negative lead on the DVOM to a known good ground, the resistance should be very high or over the limit (OL).
Torque Converter Clutch (TCC) Solenoid – Check for resistance in the TCC solenoid and internal transmission wiring on the transmission case after removing the transmission harness connector (if applicable, some makes/models use a TCM bolted directly to the transmission case). Some makes/models use the transmission harness with the TCC solenoid and the internal harness as one unit. The DVOM must be set to ohm scale with positive and negative pins for power and TCC control. The resistance must be within the manufacturer's specifications. If it is very high or over limit (OL), remove the transmission oil pan to inspect the solenoid inside the transmission if possible. Check for voltage at the TCC solenoid supply circuit or at the harness connector at the TCM with the DVOM set to volts, the positive wire on the wire being tested and the negative wire on a known good ground with the engine on/off, battery voltage should be present.
Transmission control module (TCM) – Because the torque converter clutch is only activated under certain driving conditions, it will be necessary to monitor the TCM with an advanced scan tool to determine if the TCM is commanding the TCC solenoid and what actual feedback value is on the TCM. The TCC solenoid is usually duty cycle controlled to enable more convenient torque converter engagement.
To check if the TCM is actually sending a signal, you will also need a duty cycle graphical multimeter or digital storage oscilloscope. The positive wire is tested in the harness connected to the TCM, and the negative wire is tested to a known good ground. The duty cycle must be the same as the specified TCM in the extended scan tool readout. If the cycle stays at 0% or 100% or is intermittent, recheck the connections and if all wiring/solenoid is OK, the TCM may be faulty.
Related DTC discussions
- P2770 Code Honda Accord 2003 v6I tried replacing the gearbox on my Honda Accord 2003 v6. And I am getting this P2770 code error. I have tried everything I can to fix this problem with no success. Please help me …
- P2770 Toyota Corolla 2008 onwardsHi, I recently changed the gearbox of my Toyota Corolla 2008. Then this error code P2770 torque converter clutch circuit is high. Please can anyone help with this. Thanks….
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