1997 Dodge Ram 1500 P0740 Code: High RPMs and Failure to Shift Out of Low Gear
I'm experiencing high engine RPMs, failure to shift out of lower gears, and have triggered the P0740 diagnostic code on my 1997 Dodge Ram 1500. After reviewing various forums, it seems many discussions overlook the torque converter clutch solenoid as a potential cause—though I'm not certain if this is directly related to my issue. I've already tried disconnecting the battery to reset the system, which cleared only the engine light; the problem persists. My mechanic has offered multiple explanations without arriving at a clear diagnosis, and I'm concerned about being overcharged, especially since I'm a woman and may not have access to technical expertise in this area. What are the most likely causes of P0740 with persistent high RPMs and shifting issues? Are there specific diagnostic steps or sensors (like the OSS sensor) that should be checked?
I agree—persistent failure to shift along with a P0740 code suggests additional underlying issues. Are you using a scan tool capable of retrieving all stored and live data? I recommend performing a second scan to confirm the code and check for any related parameters. Confirm that all systems are functioning properly: speedometer, tachometer, and transmission input signals. Also consider inspecting the OSS (Output Shaft Speed) sensor, as it plays a key role in gear shifting logic and may be contributing to the problem.