2001 Chrysler Sebring 2.4L Automatic Transmission Codes P0700, P0705, P0605 - Limp Mode and Speedometer Failure
Hello everyone, I'm new to this forum and recently encountered several serious issues with my 2001 Chrysler Sebring Sedan (2.4L, 4-cylinder, automatic transmission). While idling in a parking lot, the vehicle began throwing multiple engine-related diagnostic codes and has since been stuck in 'limp mode'—consistently staying in second or third gear, running at high RPMs, and overheating. Recently, the speedometer stopped working entirely. I've had the codes read and researched their meanings: - P0700: Transmission Control System Malfunction - P0705: Transmission Range Sensor (TRS) Circuit Malfunction (related to PRNDL output) - P0605: ECM or TCM ROM Failure? After reviewing various troubleshooting guides and similar threads on this forum, I suspect the issue may stem from a faulty Transmission Control Module (TCM). Given my limited budget, I'm considering replacing the TCM with a used unit from a salvage yard. However, I want to ensure it's safe and reliable. I’m not experienced with transmission systems, but I’ve spent hours watching YouTube tutorials and reading repair guides. I believe I can handle the replacement myself—provided I know where to start. Replacing components like the ECM, TCM, TRS, or shift solenoids seems expensive and potentially unnecessary if only one part is at fault. My main questions are: 1. Could these codes be caused by a single faulty TCM? 2. Is it safe to install a used TCM from a salvage yard? 3. Are there any other potential causes—such as aftermarket devices (e.g., remote starters, alarms) or electrical interference—that might trigger these codes? Any insights or advice from experienced users would be greatly appreciated. Thanks in advance!
Just to confirm—this is a 2001 Chrysler Sebring Sedan, not the Eclipse model? The speedometer should have triggered a diagnostic code if it stopped working after the codes were set. Did you notice any changes in behavior before or during the failure? Were all these codes present at once, or did one appear first and then others follow? Also, consider potential aftermarket modifications—such as remote starters or alarms—that could interfere with the transmission control system. P0700 is a generic code indicating a broader transmission control issue. P0705 points directly to a TRS sensor fault, which affects gear selection. However, P0605 is particularly serious—it suggests a failure in the ECM or TCM's internal memory (ROM), which could mean the module itself is corrupted or failing. Start by verifying whether all codes appeared simultaneously or if one developed first. Then investigate possible electrical interference sources before assuming a faulty TCM. A used TCM from a salvage yard may work, but ensure it’s fully functional and compatible with your model year and trim.