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P1633 Ford Code - Keep Alive Power Voltage Too Low

Quick Answer

The P1633 Ford code indicates that the Keep Alive Power (KAP) voltage in the vehicle's Powertrain Control Module (PCM) is too low. Common causes include Faulty battery or alternator, Corroded or loose battery terminals, Defective KAP power supply circuit. 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 Ford indicates Keep Alive Power Voltage Too Low .
Common causes
Common causes include Faulty battery or alternator, Corroded or loose battery terminals, Defective KAP power supply circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 18, 2024
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Code P1633 Ford Description

The P1633 Ford code indicates that the Keep Alive Power (KAP) voltage in the vehicle's Powertrain Control Module (PCM) is too low. The KAP voltage is essential for maintaining the memory of the PCM, which stores important data such as fuel trim values, idle speed, and other parameters necessary for proper engine operation. When the KAP voltage is too low, it can lead to issues with the vehicle's performance and drivability.

OBDII Code P1633 Ford - Keep Alive Power Voltage Too Low
P1633 Ford Code - Keep Alive Power Voltage Too Low

Common Causes of P1633 Ford

  1. Faulty battery or alternator
  2. Corroded or loose battery terminals
  3. Defective KAP power supply circuit
  4. Malfunctioning PCM
  5. Wiring or connection issues

Symptoms of P1633 Ford

  1. Engine stalling or rough idling
  2. Difficulty starting the vehicle
  3. Poor fuel efficiency
  4. Illumination of the check engine light
  5. Erratic engine performance

How to Fix P1633 Ford

  1. Check the battery and alternator for proper voltage output.
  2. Inspect and clean the battery terminals to ensure a good connection.
  3. Test the KAP power supply circuit for any faults or damage.
  4. Scan the PCM for any error codes and replace if necessary.
  5. Clear the code from the PCM and perform a test drive to ensure the issue is resolved.

Cost to Fix P1633 Ford

The typical repair costs for addressing a P1633 Ford code can range from $100 to $500, depending on the specific cause of the issue and the parts needed for repair. This estimate includes the cost of diagnostic tests, replacement parts, and labor. However, actual costs may vary based on the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It is advisable to consult with a professional mechanic for a more accurate cost estimate.

What does this mean?

Tech Notes for P1633 Ford









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Information for Specific Ford Models

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 Ford Code

1. What does the OBDII code P1633 for Ford mean?

The code P1633 indicates that the Keep Alive Power (KAP) voltage is too low in the vehicle's powertrain control module (PCM).

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

Common symptoms may include engine stalling, rough idling, poor acceleration, and difficulty starting the vehicle.

3. What are the possible causes of a P1633 code in a Ford vehicle?

Potential causes of a P1633 code include a faulty battery, alternator issues, wiring problems, a malfunctioning PCM, or issues with the vehicle's electrical system.

4. How can I diagnose a P1633 code in my Ford vehicle?

Diagnosing a P1633 code typically involves checking the battery voltage, inspecting the alternator, testing the wiring connections, and using a diagnostic scanner to read the code and perform further tests.

5. Can I still drive my Ford vehicle with a P1633 code?

It is not recommended to drive your vehicle with a P1633 code, as it can lead to performance issues and potential stalling, which can be unsafe.

6. How can I repair a P1633 code in my Ford vehicle?

Repairing a P1633 code may involve replacing the battery, repairing wiring connections, testing and possibly replacing the alternator, and resetting the code using a diagnostic scanner.

7. Is it necessary to reset the PCM after repairing a P1633 code?

Yes, it is important to reset the PCM using a diagnostic scanner after repairing a P1633 code to clear the code and ensure the vehicle's systems are functioning properly.

8. Can a DIY enthusiast fix a P1633 code in a Ford vehicle?

While some basic checks and repairs can be done by a DIY enthusiast, diagnosing and repairing a P1633 code may require advanced diagnostic tools and expertise, so it is recommended to consult a professional mechanic.

9. Will a P1633 code affect my Ford vehicle's fuel efficiency?

Yes, a P1633 code can impact your vehicle's fuel efficiency due to the potential performance issues it causes, such as rough idling and poor acceleration.

10. How much does it cost to repair a P1633 code in a Ford vehicle?

The cost of repairing a P1633 code can vary depending on the underlying issue causing the code, but it may range from a few hundred dollars to over a thousand dollars, depending on the extent of the repairs needed.

Discuss the causes and fixes for P1633 Ford OBDII Code

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  • Hello my name is Larry Fisher of Hot Spring Ar my girlfriends 2010 Ford Edge limited edition front wheel drive 3.5 V6 Wont start initially we took it a Service shop that said it was the timing belt had a good friend and knowledgeable in auto mechanics tried to replace belt but had trouble removing a particular pulley but said belt , guides and adjusters looked Good so we felt confident that was Not the issue so I began checking fuses and we replaced a ignition coils, all spark plugs as the vehicle still wouldn't start we began looking into possible fuel issue replaced intire fuel pump assembly and I seperated fuel line at fuel Rail and verified pump was priming as I could here it as well so I purchased a OBD 2 code reader and code P 1633 came up Ford said was the Keep Alive circuit/ memory circuit Autozone suggested voltage regulator said if I could bring it in they could bench test it I am working to remove alternator and having some trouble removed passenger tire n wheel well housing ( ? ) but after fighting and trying to lower AC compressor still wouldn't allow removal Now I will work to remove it from top side which seems tasking and AC lines appear as could cause difficulties Any help would be Very much appreciated Thank U L.F.

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  • Here are the instructions suggested by the factory service manual. You must remove the cooling fan to get enough space to remove the alternator. I hope it helps.

    Image

    Click here to enlarge image

    1. Disconnect the battery

    2. Remove the cooling fan

    3. Rotate the accessory drive belt tensioner counterclockwise and position the accessory drive belt aside.

    4. Position the generator B+ terminal protective cover aside, remove the nut and position the generator B+ terminal aside.
    - To install, tighten to 17 Nm (150 lb-in).

    5. Disconnect the generator electrical connector.
    - Detach the pin-type retainer and wiring harness.

    6. Remove the generator stud nut.
    - To install, tighten to 47 Nm (35 lb-ft).

    7. Remove the generator stud.
    - To install, tighten to 8 Nm (71 lb-in).

    8. Remove the RH fender splash shield

    9. Loosen the generator bolt and remove the generator.
    - To install, tighten to 47 Nm (35 lb-ft).

    10. To install, reverse the removal procedure.

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