Shifting Gears: Uncovering the Common Transmission Issues in the 2017 Buick Lacrosse
The 2017 Buick Lacrosse is a mid-size luxury sedan that garnered significant attention in the automotive market due to its sleek design, impressive features, and reliable performance. However, like any complex machine, it's not immune to issues. A closer look at owner reviews and forum discussions reveals that the transmission system is a common area of concern for many 2017 Buick Lacrosse owners. In this article, we'll delve into the most common transmission issues, explore potential causes, and discuss possible solutions to get you back on the road.
### Problems with the 6-Speed Automatic Transmission
The 6-speed automatic transmission in the 2017 Buuck Lacrosse has been at the center of several complaints from owners. The issues range from slipping and hesitation to complete transmission failure. A common thread among these problems are faulty sensors, clogged transmission fluid, and software glitches. Many owners have reported feeling a slight slip or hesitation when shifting gears, especially in city driving scenarios. This phenomenon is often described as a "slip" or "hesitation" and can be particularly unsettling for new drivers.
### **Faulty Sensors**
Causes and Symptoms
* Faulty pressure sensors: Pressure sensors are responsible for monitoring the fluid pressure within the transmission system. When these sensors malfunction, it can lead to incorrect readings, causing the transmission to slip or hesitate.
* Incorrect sensor values: If the values provided by the pressure sensors are incorrect, it can confuse the transmission control module (TCM), leading to erratic shifting behavior.
* Symptoms:
* Unpredictable shifting
* Difficulty shifting into higher gears
* Shifting into neutral or park unintentionally
* Fault codes stored in the TCM
Many owners have reported that after replacing faulty sensors, the issue has been resolved. This highlights the importance of thorough maintenance and inspection of the transmission system.
Troubleshooting Transmission Issues: A DIY Approach
### **Checking Transmission Fluid**
Why is Transmission Fluid Important?
* Lubrication: Transmission fluid helps to lubricate the complex components within the transmission system, reducing friction and preventing wear.
* Cooling: The fluid also helps to dissipate heat generated within the transmission during operation.
If you suspect an issue with the transmission fluid, it's essential to check its levels and condition. Here's a DIY guide:
1. Locate the transmission dipstick, usually labeled as "Transmission" or "ATF."
2. Pull out the dipstick and wipe it clean with a cloth or paper towel.
3. Insert the dipstick back into the transmission and pull it out again.
4. Check the fluid level by looking at the end of the dipstick. It should be at or above the recommended minimum level.
5. Check the fluid color. It should be a light brown or clear color. Avoid driving the vehicle if the fluid is dark or dirty.
6. If the fluid level is low, add the recommended type and amount of transmission fluid.
### **Common Fault Codes**
The TCM in the 2017 Buick Lacrosse is capable of storing fault codes related to transmission issues. These codes can help diagnose the problem and provide a clearer understanding of the issue:
* **DTC P0760:** Transmission fluid temperature sensor circuit malfunction.
* **DTC P0761:** Transmission fluid temperature sensor range/performance problem.
* **DTC P0775:** Torque converter-clutch solenoid circuit malfunction.
* **DTC P0776:** Torque converter-clutch solenoid performance problem.
By reviewing these codes, owners can better understand the root cause of the issue and take the necessary steps to address it.
### **Software Glitches**
Why Software is Important
* Transmission control: The TCM is responsible for controlling the behavior of the transmission system.
* Communication between modules: The TCM communicates with other modules, such as the engine control module (ECM), to ensure smooth operation.
Software glitches can be caused by faulty software, incorrect programming, or incompatible updates. These glitches can lead to erratic shifting behavior, hesitation, and even complete transmission failure.
Some owners have reported that after updating the TCM software or replacing faulty modules, the issue has been resolved.
### **The Role of a Professional Mechanic**
While troubleshooting and DIY repairs can be helpful in identifying the issue, it's crucial to seek the assistance of a professional mechanic when dealing with complex transmission problems. A skilled mechanic can:
* Accurately diagnose the issue using specialized equipment and software.
* Perform repairs and maintenance tasks with confidence and expertise.
* Identify potential underlying causes that may not be immediately apparent.
The 2017 Buick Lacrosse is a reliable vehicle, but like any complex machine, it's not immune to issues. By understanding the common transmission problems, their causes, and potential solutions, owners can take proactive steps to prevent or address these issues. Always consult the owner's manual, contact a professional mechanic, or contact the manufacturer for guidance on repairing and maintaining your vehicle.
References:
- National Highway Traffic Safety Administration (NHTSA)
- Automotive Transmission Control System (ATCS)
- OBD-II Code Lookup
- 2017 Buick Lacrosse Owner's Manual
- Official Buick Technical Service Bulletin (TSB) documentation
Disclaimer:
This article is for informational purposes only and should not be used as a substitute for professional advice or diagnosis. Always consult a qualified mechanic before attempting any repairs or maintenance on your vehicle.
