AutoCodes – Ford – P1633 2008 Ford Fusion

P1633 2008 Ford Fusion Code - Keep Alive Power Voltage Too Low

Quick Answer

The Keep Alive Power (KAPWR) provides a constant voltage input independent of the ignition switch state to the Powertrain Control Module (PCM). Common causes include Open Keep Alive Power (KAPWR) circuit, Faulty Powertrain Control Module (PCM). 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: P1633 2008 Ford Fusion indicates Keep Alive Power Voltage Too Low .
Common causes: Common causes include Open Keep Alive Power (KAPWR) circuit, Faulty Powertrain Control Module (PCM).
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 3,803

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 13, 2020

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

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

Code P1633 2008 Ford Fusion Description

The Keep Alive Power (KAPWR) provides a constant voltage input independent of the ignition switch state to the Powertrain Control Module (PCM). This voltage is used by the PCM to maintain the Keep Alive Memory (KAM). The Diagnostic Trouble Code (DTC) indicates that the Keep Alive Power circuit has experienced a power interrupt. Loss of Keep Alive Power to the Powertrain Control Module results in immediate Malfunction Indicator Lamp (MIL) illumination and sets DTC P1633.

OBDII Code P1633 2008 Ford Fusion - Keep Alive Power Voltage Too Low - AutoCodes.com — P1633 2008 Ford Fusion Code - Keep Alive Power Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P1633 2008 Ford Fusion?

Open Keep Alive Power (KAPWR) circuit
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1633 2008 Ford Fusion?

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 P1633 2008 Ford Fusion 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 P1633 2008 Ford Fusion code?

Need more information on how to fix the P1633 2008 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1633 2008 Ford Fusion 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.

Frequently Asked Questions about P1633 2008 Ford Fusion Code

What does the OBDII code P1633 mean for a 2008 Ford Fusion?

P1633 indicates that the Keep Alive Power (KAP) voltage is too low, which can affect the vehicle's ability to retain important data and settings.

What are common symptoms of the P1633 code in a 2008 Ford Fusion?

Common symptoms may include issues with starting the vehicle, erratic behavior of the electrical system, and loss of stored settings such as radio presets.

What can cause the P1633 code to trigger in a 2008 Ford Fusion?

Causes can include a weak or failing battery, poor electrical connections, damaged wiring, or a malfunctioning powertrain control module (PCM).

How can I diagnose the P1633 code on my 2008 Ford Fusion?

To diagnose P1633, check the battery voltage with the engine off and running, inspect battery terminals and cables for corrosion, and test for continuity and shorts in the wiring harness.

What repairs can fix the P1633 code in a 2008 Ford Fusion?

Repair options may include replacing the battery if itâ€™s weak, cleaning or replacing corroded battery terminals, and repairing any damaged wiring or connectors.

Can driving with the P1633 code cause further damage to my vehicle?

While it may not cause immediate damage, driving with this code can lead to further electrical issues or prevent the vehicle from starting reliably.

Is it safe to drive my 2008 Ford Fusion with the P1633 code?

It is generally not recommended to drive the vehicle if you are experiencing symptoms like difficulty starting or erratic electrical behavior, as these can lead to more significant problems.

How do I reset the P1633 code after repairs?

Once repairs are made, you can reset the P1633 code by using an OBDII scanner to clear the code, or by disconnecting the battery for a few minutes and then reconnecting it.

Will the P1633 code clear itself after fixing the problem?

The code may clear itself after a certain number of drive cycles if the issue is resolved, but itâ€™s best to clear it manually to confirm that the repair was successful.