AutoCodes – GMC – P171A GMC

P171A GMC Code - Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit

Quick Answer

The automatic transmission auxiliary fluid accumulator is used to supply transmission fluid line pressure following an Autostop event. Common causes include Faulty Automatic Transmission Accumulator Solenoid Valve, Automatic Transmission Accumulator Solenoid Valve harness is open or shorted, Automatic Transmission Accumulator Solenoid Valve 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: P171A GMC indicates Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit.
Common causes: Common causes include Faulty Automatic Transmission Accumulator Solenoid Valve, Automatic Transmission Accumulator Solenoid Valve harness is open or shorted, Automatic Transmission Accumulator Solenoid Valve 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.

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Code Popularity 1,148

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P171A GMC Description

The automatic transmission auxiliary fluid accumulator is used to supply transmission fluid line pressure following an Autostop event. The accumulator has a solenoid valve which controls the charging and discharge of the accumulator pressure. Power to the solenoid is provided from an ignition circuit. The Hybrid/EV Powertrain Control Module 1 controls the accumulator solenoid by providing the ground path to the control circuit. The Hybrid/EV Powertrain Control Module 1 detects an open circuit on the transmission surge solenoid circuit for 1 s.

OBDII Code P171A GMC - Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit - AutoCodes.com — P171A GMC Code - Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit

What does this mean?

What are the Possible Causes of the DTC P171A GMC?

Faulty Automatic Transmission Accumulator Solenoid Valve
Automatic Transmission Accumulator Solenoid Valve harness is open or shorted
Automatic Transmission Accumulator Solenoid Valve circuit poor electrical connection
Faulty Hybrid/EV Powertrain Control Module 1

How to Fix the DTC P171A GMC?

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 P171A GMC 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.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P171A GMC Code

1. What are the common symptoms of OBDII code P171A in a GMC vehicle?

The common symptoms of OBDII code P171A in a GMC vehicle include harsh shifting, transmission slipping, poor acceleration, and illuminated Check Engine Light.

2. What does the OBDII code P171A GMC indicate?

OBDII code P171A in a GMC vehicle specifically refers to an issue with the Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit.

3. What are the possible causes of OBDII code P171A in a GMC vehicle?

The possible causes of OBDII code P171A in a GMC vehicle can include faulty solenoid valve, wiring issues, low transmission fluid levels, or a malfunctioning transmission control module.

4. How serious is OBDII code P171A in a GMC vehicle?

OBDII code P171A can lead to transmission performance issues and should be addressed promptly to prevent further damage to the transmission system.

5. Can I continue driving with OBDII code P171A in my GMC vehicle?

It is not recommended to continue driving with OBDII code P171A in your GMC vehicle as it can cause further damage to the transmission system.

6. How is OBDII code P171A in a GMC vehicle diagnosed?

Diagnosing OBDII code P171A in a GMC vehicle typically involves using a scan tool to retrieve the code, inspecting the transmission fluid level and condition, and testing the solenoid valve and related circuitry.

7. How can OBDII code P171A in a GMC vehicle be repaired?

Repairing OBDII code P171A in a GMC vehicle may involve replacing the faulty solenoid valve, repairing any wiring issues, ensuring proper transmission fluid levels, or reprogramming the transmission control module.

8. Can resetting the Check Engine Light resolve OBDII code P171A in a GMC vehicle?

Resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing OBDII code P171A in a GMC vehicle.

9. Are there any DIY tips for addressing OBDII code P171A in a GMC vehicle?

DIY tips for addressing OBDII code P171A in a GMC vehicle include checking the transmission fluid level, inspecting for any visible wiring issues, and ensuring the solenoid valve is properly connected.

10. How much does it typically cost to repair OBDII code P171A in a GMC vehicle?

The cost to repair OBDII code P171A in a GMC vehicle can vary depending on the specific issue, but it may range from $200 to $500 for parts and labor at a repair shop.