P171D Buick Code - Transmission Fluid Pressure Accumulator System Performance
Quick Answer
The Automatic Transmission Auxiliary Fluid Accumulator is used to provide transmission fluid line pressure to the transmission during an autostart event. Common causes include Faulty Transmission Fluid Pressure Accumulator, Transmission Fluid Pressure Accumulator harness is open or shorted, Transmission Fluid Pressure Accumulator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P171D Buick indicates Transmission Fluid Pressure Accumulator System Performance.
- Common causes
- Common causes include Faulty Transmission Fluid Pressure Accumulator, Transmission Fluid Pressure Accumulator harness is open or shorted, Transmission Fluid Pressure Accumulator circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P171D Buick Description
When the engine is shut off during an autostop event, there is no transmission line pressure. During an autostart event, the Hybrid/EV Powertrain Control Module 1 commands the Automatic Transmission Auxiliary Fluid Accumulator solenoid valve on, allowing transmission fluid to discharge from the accumulator, supplying line pressure to the transmission. The accumulator will start to recharge when the transmission fluid pump increases line pressure higher than accumulator pressure. Transmission fluid will flow through the solenoid valve until the Hybrid/EV Powertrain Control Module 1 turns the solenoid off and also flow through a check valve.
The Hybrid/EV Powertrain Control Module 1 monitors clutch slip during an autostart event. The DTC will set if the Hybrid/EV Powertrain Control Module 1 detects that the accumulator system is not capable of supplying adequate pressure during autostart.
Hybrid/EV Powertrain Control Module 1 detects excessive transmission slip during an autostart. This must occur 15 times, with 3 of the times on separate autostart events.
What are the Possible Causes of the DTC P171D Buick?
- Faulty Transmission Fluid Pressure Accumulator
- Transmission Fluid Pressure Accumulator harness is open or shorted
- Transmission Fluid Pressure Accumulator circuit poor electrical connection
How to Fix the DTC P171D Buick?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P171D Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P171D Buick code?
Need more information on how to fix the P171D Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P171D Buick code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P171D Buick Code
1. What are common symptoms of OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- Common symptoms include harsh shifting, delayed or erratic gear changes, reduced fuel efficiency, and the transmission slipping.
2. What are the possible causes of OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- Possible causes include low transmission fluid levels, a faulty pressure control solenoid, a damaged accumulator, or issues with the transmission control module.
3. How can I diagnose OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- Diagnosis typically involves scanning the vehicle for trouble codes, checking the transmission fluid level and condition, and conducting a thorough inspection of the pressure accumulator and related components.
4. Can I continue driving my Buick with OBDII code P171D related to the Transmission Fluid Pressure Accumulator System?
- It is not recommended to continue driving the vehicle with this code, as it can lead to further damage to the transmission and potentially result in complete transmission failure.
5. How can I repair OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- Repair options may include replenishing or replacing the transmission fluid, repairing or replacing the pressure control solenoid, and inspecting and replacing the pressure accumulator if necessary.
6. Is it possible to reset the OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- While clearing the trouble code may temporarily turn off the check engine light, it is important to address the underlying issue causing the code to prevent future transmission problems.
7. How much does it typically cost to repair OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- Repair costs can vary depending on the specific issue causing the code, but it is recommended to consult a professional mechanic for an accurate diagnosis and cost estimate.
8. Can a DIY enthusiast fix OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- While some aspects of the repair may be tackled by experienced DIYers, diagnosing and repairing transmission issues can be complex, so it is advisable to seek professional help to ensure the problem is addressed correctly.
9. Are there any preventive maintenance steps to avoid OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- Regularly checking and maintaining proper transmission fluid levels, addressing any leaks promptly, and following the manufacturer's recommended service intervals can help prevent issues leading to this trouble code.
10. How long does it take to repair OBDII code P171D in a Buick related to the Transmission Fluid Pressure Accumulator System?
- The repair time can vary depending on the specific cause of the code and the extent of the necessary repairs, so it is best to consult with a professional mechanic for a more accurate estimate.
Discuss the causes and fixes for P171D Buick OBDII Code
Code P171D Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
