2002 Cadillac Deville p0741 TCC Stuck Off - Tech2 and scope testing

Join us in this diagnostic journey as we tackle a 2002 Cadillac Deville with multiple warning lights illuminated – traction control, ABS, engine, and low coolant level. Armed with the old but powerful Tech2 scan tool, we dive into the trouble codes and uncover a potential culprit: the notorious P0741 TCC stuck off code.

In our pursuit of understanding the issue, we conduct a torque converter lockup test using the Tech2's bidirectional controls. No RPM drop during the test raises suspicions, leading us to focus on the TCC solenoid.

As we delve deeper into the diagnosis, a new challenge emerges – the ABS pump motor refuses to cooperate. Determining that the ABS module may need internal circuit repair, we set it aside for future testing.

Returning to the TCC solenoid, we utilize the Snapon Zeus + as a digital storage oscilloscope, we perform intricate circuit tests to unveil the solenoid's condition, proving its functionality. The solenoid circuit is good and the solenoid is not stuck. We eliminate external factors and pinpoint an internal transmission issue. Uncovering a TSB (Technical Service Bulletin) for a torn seal inside the transmission, we conclude that the transmission requires the a specialized transmission repair shop.

Our diagnostic adventure doesn't end there. A quick circuit test on the secondary air pump reveals potential issues, but the customer's authorization is needed to delve further into the ABS module or address the secondary air code. Will these additional investigations unveil more mysteries?

Stay tuned as we unravel the complexities of automotive diagnostics, demonstrating the power of advanced scan tools and oscilloscopes in identifying and solving intricate problems. Don't forget to subscribe for more in-depth automotive troubleshooting and repair content!