AutoCodes – Ford – P1633 2002 Ford F150

P1633 2002 Ford F150 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 2002 Ford F150 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 7,168

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 2002 Ford F150 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 2002 Ford F150 - Keep Alive Power Voltage Too Low - AutoCodes.com — P1633 2002 Ford F150 Code - Keep Alive Power Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P1633 2002 Ford F150?

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

How to Fix the DTC P1633 2002 Ford F150?

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 2002 Ford F150 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 2002 Ford F150 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 2002 Ford F150 Code

What does the OBDII code P1633 mean for a 2002 Ford F150?

P1633 indicates that the Keep Alive Power (KAP) voltage is too low, which affects the vehicle's ability to retain memory for engine parameters and settings.

What are the common symptoms of the P1633 code?

Symptoms may include erratic engine performance, difficulty starting, loss of power to accessories, and illumination of the check engine light.

What could cause the P1633 code to appear?

The code can be triggered by a weak battery, poor battery connections, corroded terminals, or issues with the vehicleâ€™s electrical system.

How can I diagnose the cause of the P1633 code?

Start by checking the battery voltage and connections, inspect wiring and connectors for damage or corrosion, and test the alternator's output to ensure itâ€™s charging properly.

What should I check first if my Ford F150 shows the P1633 code?

Begin by inspecting the battery and its terminals for corrosion, ensuring the connections are tight and clean. A weak or failing battery may need to be replaced.

Can I drive my 2002 Ford F150 with the P1633 code?

While you might be able to drive the vehicle, it is advisable to address the issue as it can lead to further electrical problems or poor engine performance.

What repairs are typically needed to fix the P1633 code?

Repairs may include cleaning or replacing battery terminals, replacing a weak battery, or fixing any wiring issues in the electrical system.

Will clearing the P1633 code fix the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue will need to be resolved for the code not to return.

How can I prevent the P1633 code from coming back?

Regularly maintain the battery and electrical system, including checking for corrosion, ensuring proper connections, and replacing the battery as needed.

Is the P1633 code related to other OBDII codes?

Yes, it can be associated with other codes that relate to electrical system issues or battery problems, so it's important to check for additional codes during diagnostics.