AutoCodes – Ford – P1633 2003 Ford F150

P1633 2003 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 2003 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 11,182
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jul 13, 2020
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Code P1633 2003 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 2003 Ford F150 - Keep Alive Power Voltage Too Low  - AutoCodes.com
P1633 2003 Ford F150 Code - Keep Alive Power Voltage Too Low

What are the Possible Causes of the DTC P1633 2003 Ford F150?

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

How to Fix the DTC P1633 2003 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 2003 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 2003 Ford F150 code?

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Need Help with the 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 2003 Ford F150 Code

1. What are the common symptoms of OBDII code P1633 on a 2003 Ford F150?

The common symptoms of code P1633 on a 2003 Ford F150 include difficulty starting the vehicle, rough idling, and potential stalling.

2. What does the OBDII code P1633 "Keep Alive Power Voltage Too Low" mean for a 2003 Ford F150?

Code P1633 indicates that the Keep Alive Power (KAP) voltage is lower than the expected threshold. This voltage is essential for maintaining certain vehicle settings when the engine is off.

3. What are the possible causes of the Keep Alive Power voltage being too low in a 2003 Ford F150?

Common causes of the Keep Alive Power voltage being too low in a 2003 Ford F150 include a faulty battery, a failing alternator, corroded wiring connections, or a malfunctioning PCM (Powertrain Control Module).

4. How can I diagnose and repair OBDII code P1633 on my 2003 Ford F150?

To diagnose and repair code P1633, it is recommended to start by checking the battery voltage, inspecting the wiring connections, testing the alternator, and scanning the PCM for any related faults. Repair or replace any faulty components as needed.

5. Can I continue driving my 2003 Ford F150 with OBDII code P1633?

It is not recommended to drive your vehicle with code P1633, as it can lead to potential stalling and other performance issues. It is best to address the underlying cause of the code promptly.

6. How much does it typically cost to repair OBDII code P1633 on a 2003 Ford F150?

The cost of repairing code P1633 on a 2003 Ford F150 can vary depending on the specific cause of the issue. Costs may include parts such as a new battery or alternator, as well as labor charges if professional assistance is required.

7. Can a DIY enthusiast fix OBDII code P1633 on a 2003 Ford F150?

Depending on the DIY enthusiast's skill level and access to tools, it may be possible to address code P1633 at home. However, diagnosing and repairing electrical issues can be challenging, so it's essential to proceed with caution.

8. Will resetting the OBDII system clear code P1633 on a 2003 Ford F150?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing P1633 is not addressed, the code is likely to reappear. It's crucial to diagnose and fix the root cause of the problem.

9. How urgent is it to address OBDII code P1633 on a 2003 Ford F150?

While code P1633 may not cause immediate harm to your vehicle, it can lead to performance issues and potential stalling. It is advisable to address the code promptly to avoid further complications.

10. Is code P1633 specific to 2003 Ford F150 vehicles only?

While code P1633 may be more common in 2003 Ford F150 models, it can potentially occur in other vehicles as well. The underlying issue of low Keep Alive Power voltage is not exclusive to a particular make or model.

Discuss the causes and fixes for P1633 2003 Ford F150 OBDII Code

  • goodnight friend have a problam with my truck f150 throws me the error code P1633 is not to make the e escaniado goes that code and delete and re- appear and my truck gets out all by this error code that could be me this throwing that fails I hope your help thanks

  • The codes means that the Powertrain Control Module (PCM) it's not getting any power from the battery to keep the PCM ON when the engine it's OFF. Start by inspecting all the fuses.

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