AutoCodes – Ford – P1633 2009 Ford Fusion

P1633 2009 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 2009 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 3,068

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 2009 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 2009 Ford Fusion - Keep Alive Power Voltage Too Low - AutoCodes.com — P1633 2009 Ford Fusion Code - Keep Alive Power Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P1633 2009 Ford Fusion?

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

How to Fix the DTC P1633 2009 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 2009 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 2009 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 2009 Ford Fusion Code

1. What does the OBDII code P1633 mean on a 2009 Ford Fusion?

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

2. What are the common symptoms of code P1633 in a 2009 Ford Fusion?

Common symptoms include the potential loss of saved settings (like radio presets or adaptive learning data), intermittent starting issues, or no noticeable symptoms at all.

3. What causes the P1633 code to appear in a 2009 Ford Fusion?

The code is typically caused by a disconnected or loose battery, a faulty PCM power circuit, a blown fuse, a weak battery, or corroded wiring or terminals.

4. Can I drive my 2009 Ford Fusion with a P1633 code?

Yes, the vehicle is usually drivable with this code, but it may experience minor issues like loss of adaptive settings or intermittent performance problems.

5. How do I fix the P1633 code on my 2009 Ford Fusion?

Inspect the battery connections and wiring, check the KAP fuse, ensure the battery is fully charged, and repair or replace any damaged components in the circuit.

6. Can a weak battery cause the P1633 code on a 2009 Ford Fusion?

Yes, a weak or failing battery can cause insufficient voltage to the PCM, triggering the P1633 code.

7. Where is the Keep Alive Power (KAP) circuit located on a 2009 Ford Fusion?

The KAP circuit typically involves a dedicated fuse and wiring connected to the PCM and battery, allowing it to retain memory when the engine is off.

8. How do I reset the P1633 code on a 2009 Ford Fusion?

After addressing the cause, clear the code using an OBDII scanner. If the issue is resolved, the code should not return.

9. Can a blown fuse cause the P1633 code in a 2009 Ford Fusion?

Yes, if the fuse supplying power to the PCMâ€™s Keep Alive Memory (KAM) circuit is blown, it can trigger the P1633 code.

10. How much does it cost to repair a P1633 code on a 2009 Ford Fusion?

Repair costs vary depending on the cause, but common fixes like repairing connections or replacing a fuse are relatively inexpensive, ranging from $50 to $150.