AutoCodes – Cadillac – P171B Cadillac

P171B Cadillac Code - Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit Low Voltage

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: P171B Cadillac indicates Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit Low Voltage.
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 581

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 P171B Cadillac 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 a short to ground on the transmission surge solenoid circuit for 1 s.

OBDII Code P171B Cadillac - Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit Low Voltage - AutoCodes.com — P171B Cadillac Code - Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P171B Cadillac?

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 P171B Cadillac?

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 P171B Cadillac 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 P171B Cadillac Code

What does the OBDII code P171B mean for my Cadillac?

The OBDII code P171B indicates a low voltage condition in the transmission fluid pressure accumulator solenoid valve control circuit, which can lead to issues with transmission performance.

What are the common symptoms associated with the P171B code?

Symptoms may include rough shifting, delayed engagement, slipping transmission, or warning lights on the dashboard.

What could cause the P171B code to trigger?

Causes can include a faulty solenoid, damaged wiring or connectors in the control circuit, low transmission fluid levels, or issues with the transmission control module.

How can I diagnose the P171B code?

Diagnosing the code typically involves using an OBDII scanner to confirm the code, visually inspecting the wiring and connectors, checking the transmission fluid level, and testing the solenoid for proper operation.

What repairs might be necessary for the P171B code?

Repairs could include replacing the transmission fluid pressure accumulator solenoid, repairing damaged wiring or connectors, or addressing any issues related to low transmission fluid.

Will driving with the P171B code cause further damage?

Yes, continuing to drive with this code can lead to more severe transmission issues, so itâ€™s advisable to address the problem promptly.

Can I clear the P171B code after repairs?

Yes, once the repairs are made, you can use an OBDII scanner to clear the code, but itâ€™s essential to ensure the underlying issue is resolved to prevent the code from returning.

Is it safe to drive my Cadillac if the P171B code is present?

While it may be safe for short distances at low speeds, itâ€™s best to avoid prolonged driving to prevent potential transmission damage.

What is the average cost to repair the issue related to the P171B code?

Repair costs can vary widely, but you might expect to pay anywhere from $100 to $600 depending on whether you need to replace the solenoid, repair wiring, or perform other related services.