AutoCodes – Buick – P1555 Buick

P1555 Buick Code - Electronic Variable Orifice Output

Quick Answer

With the engine runtime over 2.5 seconds, vehicle speed over 10 mph, current flowing in Electronic Variable Orifice (EVO) solenoid (to increase steering effort), the Powertrain Control Module (PCM) detects that desired and feedback current did not match. Common causes include Faulty Electronic Variable Orifice (EVO) solenoid, Electronic Variable Orifice (EVO) solenoid harness is open or shorted, Electronic Variable Orifice (EVO) solenoid 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: P1555 Buick indicates Electronic Variable Orifice Output.
Common causes: Common causes include Faulty Electronic Variable Orifice (EVO) solenoid, Electronic Variable Orifice (EVO) solenoid harness is open or shorted, Electronic Variable Orifice (EVO) solenoid 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 3,216

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 Aug 30, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1555 Buick Description

OBDII Code P1555 Buick - Electronic Variable Orifice Output - AutoCodes.com — P1555 Buick Code - Electronic Variable Orifice Output

What does this mean?

What are the Possible Causes of the DTC P1555 Buick?

Faulty Electronic Variable Orifice (EVO) solenoid
Electronic Variable Orifice (EVO) solenoid harness is open or shorted
Electronic Variable Orifice (EVO) solenoid circuit poor electrical connection

How to Fix the DTC P1555 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 P1555 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.

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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.