AutoCodes – Ford – P1633 1998 Ford F150

P1633 1998 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 1998 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 3,485

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 1998 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 1998 Ford F150 - Keep Alive Power Voltage Too Low - AutoCodes.com — P1633 1998 Ford F150 Code - Keep Alive Power Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P1633 1998 Ford F150?

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

How to Fix the DTC P1633 1998 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 1998 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 1998 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 1998 Ford F150 Code

1. What are the common symptoms of OBDII code P1633 in a 1998 Ford F150?

- Common symptoms include intermittent stalling, rough idling, difficulty starting the vehicle, and the Check Engine Light illuminating.

2. What does the OBDII code P1633 for a 1998 Ford F150 mean?

- The code indicates that the Keep Alive Power (KAP) voltage is too low, affecting the vehicle's ability to maintain important memory settings.

3. What are the potential causes of the Keep Alive Power voltage being too low in a 1998 Ford F150?

- Possible causes include a faulty KAP power circuit, a weak battery, poor connections, a defective PCM, or issues with the vehicle's wiring.

4. How can I diagnose the issue causing OBDII code P1633 in my 1998 Ford F150?

- To diagnose the problem, you may need to check the battery voltage, inspect the wiring and connections related to the KAP circuit, and perform a thorough scan for any other trouble codes.

5. Can I continue driving my 1998 Ford F150 with the P1633 code present?

- It is not recommended to drive the vehicle with the P1633 code, as it can lead to further electrical issues and potential damage to the PCM.

6. How can I repair the Keep Alive Power voltage issue in my 1998 Ford F150?

- Repairing the issue may involve replacing the battery, repairing any damaged wiring or connections, replacing the PCM if necessary, and ensuring the KAP circuit is functioning correctly.

7. Are there any DIY tips for fixing OBDII code P1633 in a 1998 Ford F150?

- DIY tips include checking and cleaning the battery terminals, inspecting the wiring for any visible damage, and consulting the vehicle's service manual for specific troubleshooting steps.

8. Will resetting the trouble codes fix OBDII code P1633 in my 1998 Ford F150?

- Simply resetting the trouble codes may temporarily clear the Check Engine Light, but it will not fix the underlying issue causing the Keep Alive Power voltage to be too low.

9. Can a low battery voltage cause OBDII code P1633 in a 1998 Ford F150?

- Yes, a weak or failing battery can contribute to the KAP voltage dropping too low, triggering the P1633 trouble code.

10. How important is it to address OBDII code P1633 promptly in a 1998 Ford F150?

- It is crucial to address the P1633 code promptly to prevent potential damage to the vehicle's electrical system and ensure proper operation of the PCM and other components.