AutoCodes – Ford – P1633 2007 Ford Fusion

P1633 2007 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 2007 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.

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Code Popularity 5,226

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1633 2007 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 2007 Ford Fusion - Keep Alive Power Voltage Too Low - AutoCodes.com — P1633 2007 Ford Fusion Code - Keep Alive Power Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P1633 2007 Ford Fusion?

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

How to Fix the DTC P1633 2007 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 2007 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 2007 Ford Fusion code?

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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.

Frequently Asked Questions about P1633 2007 Ford Fusion Code

1. What does the OBDII code P1633 mean on a 2007 Ford Fusion?

P1633 indicates that the Keep Alive Power (KAP) voltage is too low, meaning the Powertrain Control Module (PCM) is not receiving sufficient power to maintain memory when the vehicle is off.

2. What are the symptoms of code P1633 in a 2007 Ford Fusion?

Common symptoms include loss of stored settings (like radio presets or PCM adaptive memory), difficulty starting the car, or no noticeable symptoms at all.

3. What causes the P1633 code to appear on a 2007 Ford Fusion?

Potential causes include a weak or discharged battery, corroded or loose battery terminals, a blown fuse for the Keep Alive Power circuit, or damaged wiring.

4. Can code P1633 cause drivability issues in a 2007 Ford Fusion?

Typically, P1633 does not directly affect drivability but may reset the PCM's adaptive learning, which could result in temporary performance changes.

5. How do I diagnose a P1633 code on a 2007 Ford Fusion?

Start by checking the battery voltage, inspecting battery terminals, verifying the KAP fuse, and looking for damaged or disconnected wiring in the KAP circuit.

6. Can I drive my 2007 Ford Fusion with a P1633 code?

Yes, the vehicle is usually drivable, but the PCM may lose stored data, and underlying electrical issues should be addressed to prevent further problems.

7. How do I fix the P1633 code on a 2007 Ford Fusion?

Common fixes include charging or replacing the battery, cleaning or tightening battery terminals, replacing a blown KAP fuse, or repairing damaged wiring in the circuit.

8. How much does it cost to repair a P1633 code on a 2007 Ford Fusion?

The cost depends on the issue. Replacing a battery typically costs $100â€“$200, while repairing wiring or replacing a fuse may cost less than $50 if done yourself.

9. Can a bad alternator cause the P1633 code to appear on a 2007 Ford Fusion?

Yes, a failing alternator may not properly charge the battery, leading to low voltage in the KAP circuit and triggering the P1633 code.

10. Will clearing the P1633 code fix the problem in a 2007 Ford Fusion?

Clearing the code may temporarily remove the warning, but the underlying issue causing the low KAP voltage must be resolved to prevent the code from returning.