AutoCodes – Cadillac – P1687 Cadillac

P1687 Cadillac Code - Fuel Injector Control Module Driver Stuck On

Quick Answer

This diagnostic applies to internal microprocessor integrity conditions within the Fuel Injection Control Module (FICM). Common causes include Check fuel injectors connectors, Faulty Fuel Injection Control Module (FICM), Fuel Injection Control Module harness is open or shorted. 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: P1687 Cadillac indicates Fuel Injector Control Module Driver Stuck On.
Common causes: Common causes include Check fuel injectors connectors, Faulty Fuel Injection Control Module (FICM), Fuel Injection Control Module harness is open or shorted.
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 2,961

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 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1687 Cadillac Description

This diagnostic applies to internal microprocessor integrity conditions within the Fuel Injection Control Module (FICM). The Diagnostic Trouble Code (DTC) will be set when there is an internal failure in the FICM for less than 1 second.

OBDII Code P1687 Cadillac - Fuel Injector Control Module Driver Stuck On - AutoCodes.com — P1687 Cadillac Code - Fuel Injector Control Module Driver Stuck On

What does this mean?

What are the Possible Causes of the DTC P1687 Cadillac?

Check fuel injectors connectors
Faulty Fuel Injection Control Module (FICM)
Fuel Injection Control Module harness is open or shorted
Fuel Injection Control Module circuit poor electrical connection

How to Fix the DTC P1687 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 P1687 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.