AutoCodes – Generic – P2585

P2585 Code - Fuel Additive Control Module Warning Lamp Request

Quick Answer

The main purpose of the Fuel Additive Control Module is to calculate the required amount of fuel additive and control the time of injection into the fuel tank. Common causes include Top Off Fuel Additive Tank, Faulty Fuel Additive Sensor, Faulty Fuel Additive Control Module. 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: P2585 indicates Fuel Additive Control Module Warning Lamp Request.
Common causes: Common causes include Top Off Fuel Additive Tank, Faulty Fuel Additive Sensor, Faulty Fuel Additive Control Module.
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 22,295

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 Jan 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2585 Description

The main purpose of the Fuel Additive Control Module is to calculate the required amount of fuel additive and control the time of injection into the fuel tank. It also stores Diagnostic Trouble Codes (DTC) for the fuel additive system. In addition to the already mentioned operation of the fuel additive system module, the instrument cluster will receive a command from the fuel additive system module to illuminate the Malfunction Indicator Lamp (MIL) or the Powertrain Control Module (PCM) warning indicator if there are concerns with the additive system or if the fuel additive tank requires refilling. The PCM will set the OBDII code when Fuel Additive Control Module request the warning to illuminate.

OBDII Code P2585 - Fuel Additive Control Module Warning Lamp Request - AutoCodes.com — P2585 Code - Fuel Additive Control Module Warning Lamp Request

What does this mean?

What are the Possible Causes of the DTC P2585?

Top Off Fuel Additive Tank
Faulty Fuel Additive Sensor
Faulty Fuel Additive Control Module
Fuel Additive Control Module harness is open or shorted
Fuel Additive Control Module circuit poor electrical connection

How to Fix the DTC P2585?

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 P2585 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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Information for Specific Makes

P2585 Audi — Fuel Additive Control Module Warning Lamp Request
P2585 Ford — Fuel Additive Control Module Warning Lamp Request
P2585 Volkswagen — Fuel Additive Control Module Warning Lamp Request
P2585 Volvo — Fuel Additive Control Module Warning Lamp Request

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.