AutoCodes – Mercury – P1001 Mercury

P1001 Mercury Code - Key On/Engine Running Not Able To Complete

Quick Answer

The Key On/Engine Running (KOER) on-demand self-test is a functional test of the Powertrain Control Module (PCM) carried out on-demand with the ignition ON, the engine running, and the vehicle stopped. Common causes include Incorrect Self-Test Procedure, Unexpected response from the self-test monitors, RPM out of specification. 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: P1001 Mercury indicates Key On/Engine Running Not Able To Complete.
Common causes: Common causes include Incorrect Self-Test Procedure, Unexpected response from the self-test monitors, RPM out of specification.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,772

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 18, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1001 Mercury Description

The Key On/Engine Running (KOER) on-demand self-test is a functional test of the Powertrain Control Module (PCM) carried out on-demand with the ignition ON, the engine running, and the vehicle stopped. A check of certain inputs and outputs is made during operating conditions and at a normal operating temperature. The brake pedal position, transmission control, and the power steering tests are part of the KOER on-demand self-test and must be carried out during this operation if applicable.
The Powertrain Control Module sets the non-MIL (Malfunction Indicator Lamp) Diagnostic Trouble Code (DTC) when the Key On/Engine Running (KOER) self-test does not complete in the time intended.

OBDII Code P1001 Mercury - Key On/Engine Running Not Able To Complete - AutoCodes.com — P1001 Mercury Code - Key On/Engine Running Not Able To Complete

What does this mean?

What are the Possible Causes of the DTC P1001 Mercury?

Incorrect Self-Test Procedure
Unexpected response from the self-test monitors
RPM out of specification

How to Fix the DTC P1001 Mercury?

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 P1001 Mercury 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.

Need more information about the P1001 Mercury code?

Need more information on how to fix the P1001 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1001 Mercury code diagnosed by a professional: Find a repair shop in your area

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.