1. Transmission Fluid:
* Low Fluid: Check your transmission fluid level immediately. Low fluid is a major cause of shifting problems. The level should be checked with the engine running and warm. Do not overfill. If low, topping it off might temporarily help, but you need to find out *why* it's low. A leak is a serious issue.
* Contaminated Fluid: Dirty or burnt transmission fluid can cause shifting problems. The fluid should be a reddish-pink color; if it's dark brown or smells burnt, it needs to be changed (and the cause of the contamination investigated).
2. Transmission Problems:
* Solenoids: These electrically controlled valves regulate fluid flow within the transmission. A faulty solenoid can prevent shifting.
* Valve Body: The valve body houses the solenoids and other internal components. A problem here can cause a variety of shifting issues.
* Torque Converter: This component connects the engine to the transmission. Failure or slippage can cause the car to stay in low gear.
* Internal Transmission Damage: Severe wear, broken parts, or other internal damage can cause this symptom. This is the most serious and expensive possibility.
3. Other Potential Issues:
* Throttle Position Sensor (TPS): A faulty TPS can send incorrect signals to the transmission control module (TCM), affecting shifting.
* Transmission Control Module (TCM): The TCM controls the transmission's operation. A faulty TCM can cause numerous shifting problems. This often requires specialized diagnostic equipment to test.
* Speed Sensor: An inaccurate speed signal can also cause the transmission to behave improperly.
What You Should Do:
1. Check the transmission fluid level and condition: This is the easiest and quickest check to do.
2. Do NOT continue driving the car extensively in this condition. Continuing to drive it will likely worsen the problem and cause significant damage to the transmission. Towing might be necessary.
3. Have it professionally diagnosed: Take your Stratus to a qualified mechanic or transmission specialist. They have the diagnostic tools and expertise to pinpoint the exact cause. They can perform a scan of the transmission control module to check for error codes.
Avoid attempting major repairs yourself unless you have significant automotive experience and the proper tools. Transmission repair is complex and can be easily made worse by improper procedures. A professional diagnosis is essential to avoid costly mistakes.
