* P0753: Shift Solenoid "A" Stuck ON. This solenoid controls the application of certain transmission clutch packs. "Stuck ON" means it's not releasing when it should, causing issues with shifting.
* P0758: Shift Solenoid "B" Stuck ON. Similar to P0753, but this solenoid controls a different set of clutch packs. Again, being stuck ON prevents proper shifting.
* P1860: Transmission Control System (TCS) malfunction. This is a more general code, indicating a problem with the overall control system for the transmission. It could be a faulty sensor, wiring harness issue, or even a problem with the Transmission Control Module (TCM) itself.
The fact that these codes appear together, coupled with the symptoms (intermittent high/low speed shifting, bucking, and the mileage trigger) strongly suggests a significant transmission problem. The "100 driven miles" trigger isn't a typical indicator of a specific component failure, but rather suggests the transmission might be overheating or experiencing a problem that worsens as the transmission warms up and the fluid's viscosity changes.
Possible Causes:
* Faulty Shift Solenoids: One or more shift solenoids (A and/or B) are likely failing internally, causing them to stick in the "ON" position.
* Low Transmission Fluid: Low fluid level can lead to overheating and erratic shifting. Check your transmission fluid level immediately. Be aware that the fluid level should be checked with the engine running and at operating temperature.
* Contaminated Transmission Fluid: Dirty or burnt transmission fluid can cause the solenoids and other transmission components to malfunction.
* Faulty Wiring/Connectors: A short, open circuit, or corroded connector in the wiring harness leading to the solenoids or TCM can cause these codes.
* Transmission Control Module (TCM) Failure: The TCM itself could be faulty, sending incorrect signals to the solenoids.
* Internal Transmission Problems: More serious internal issues within the transmission, such as worn clutch packs, a failing valve body, or other internal mechanical damage, are possible.
What to Do:
1. Check Transmission Fluid Level and Condition: This is the most crucial first step. If the level is low or the fluid is dark, burnt, or smells burnt, it's a serious problem.
2. Professional Diagnosis: Take your Oldsmobile Aurora to a qualified transmission specialist or a reputable mechanic. They have the tools and expertise to properly diagnose the problem and determine the best course of action. Don't just replace parts based on the codes; a proper diagnosis is crucial. A simple scan tool might show the codes, but it won't pinpoint the root cause.
3. Avoid Driving: Continuing to drive the vehicle with these problems could cause further damage to the transmission, leading to a much more expensive repair.
Ignoring this issue will likely lead to complete transmission failure. Prompt professional attention is highly recommended.
