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It may be necessary to take the car to a transmission shop or to a dealer to have the P0741 diagnostic trouble code diagnosed, because of the special scan tool that may need to be used during diagnosis. In some cars, the transmission pan will need to be dropped and if this is the case, make sure the transmission pan is dropped properly. Take your time when checking all of the wiring, including the wiring to the transmission wiring harness, TCC solenoid wiring harness, and the TCM wiring harness. In some cases, the transmission itself will need to be replaced or rebuiltĪdditional comments for consideration regarding the P0741 code.Repairing damaged wiring to the transmission wiring harness.Repairing damaged wiring to TCC solenoid.Replacing the torque converter lockup solenoid.For this reason, the P0741 trouble code is considered serious and should be addressed as soon as possible. Driving a vehicle under this condition may cause damage to other internal transmission parts. When the P0741 diagnostic trouble code is present, it is an indication that the transmission is not operating properly. It is common for the torque converter to be replaced when a faulty TCC solenoid or valve body is the actual problem. Keep in mind that the transmission pan may have to be dropped to get to all of the wiring. Be sure to check all of the transmission wiring, the TCM, and the TCC solenoids. The P0741 diagnostic trouble code can be difficult to diagnose. Common mistakes when diagnosing the P0741 code If the wiring to the TCM and the TCC solenoid pass inspection and testing, an advanced scan tool will be able to show when the TCC solenoid is activating the torque converter, and when the torque converter is operating.Īdvanced scan tools range in price from $1000-$3000, therefore it may be necessary to take the car to a shop or dealership that has it, so the P0741 code can be diagnosed properly. Inspects the wiring to the TCM for damaged wiring or shorts to ground.If a short is present, the wiring should be repaired, or the solenoid replaced. Inspects the wiring harness to the transmission for damaged and/or loose connectionsĬhecks fuses or relays for transmission (if applicable to vehicle)Ĭhecks the transmission internal wiring harness for short to ground at the TCC solenoid
Uses an OBD-II scanner to get all of the diagnostic trouble codes stored by the PCMįreeze frame data corresponding to each code is also stored by the PCM and is used to determine what conditions were present when the code first came on.Ĭlears codes then completes a test drive, using free frame data, to see if the P0741 code returns.How does a mechanic diagnose the P0741 code? It is rare, but sometimes there are no symptoms present.Car is unable to shift into high gear while at high speeds.Car may stall out after driving at high speeds.Symptoms that resemble those of a misfiring condition.Restricted hydraulic passages from dirty transmission fluid.Damage of the wiring harness to the transmission.Faulty Engine Coolant Temperature (ECT) sensor.Faulty Transmission Control Module (TCM).Wiring to the TCC solenoid that is damaged.Faulty torque converter lockup solenoid.P0743 OBD-II Trouble Code: Torque Converter Clutch Solenoid Circuit Electrical.P0742 OBD-II Trouble Code: Torque Converter Clutch Circuit Stuck On.P0740 OBD-II Trouble Code: Torque Converter Clutch (TCC) Circuit Malfunction.If the torque converter RPM and the transmission input shaft RPM are not equal, the required 1:1 ratio has not been achieved, and the P0741 diagnostic trouble code will be set by the PCM as an indication that the torque converter clutch circuit is out of performance or stuck off. The rotational speed of the torque converter and the transmission shaft should be equal when the torque converter lockup engine engages. The Powertrain Control Module (PCM) will set the P0741 diagnostic trouble code when it notices a difference between the rotational speed of the torque converter and the transmission input shaft that is greater than 200 revolutions per minute (RPM). Torque Converter Clutch Circuit Performance or Stuck Off What the P0741 code means