P1633 Code - Keep Alive Power Voltage Too Low

Quick Answer

The P1633 diagnostic trouble code indicates that the Keep Alive Power (KAP) voltage in the vehicle's computer system is too low. Common causes include Faulty battery, Failing alternator, Poor electrical connections. 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 indicates Keep Alive Power Voltage Too Low .

Common causes

Common causes include Faulty battery, Failing alternator, Poor electrical connections.

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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• FAQs
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Common Causes of P1633

Symptoms of P1633

How to Fix P1633

Cost to Fix P1633

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Code P1633 Information for Specific Makes

• P1633 Audi — Accelerator Pedal Position Sensor 2 Signal Low Input
• P1633 BMW — Throttle Valve Adaptation Limp-Home Position Unknown
• P1633 Buick — Ignition Supply Power Circuit Low Voltage
• P1633 Cadillac — Ignition Supply Power Circuit Low Voltage
• P1633 Chevrolet — Ignition Supply Power Circuit Low Voltage
• P1633 Ford — Keep Alive Power Voltage Too Low
• P1633 GMC — Ignition Supply Power Circuit Low Voltage
• P1633 Hyundai — Immobilizer Status Lamp
• P1633 KIA — Battery Voltage Overcharging
• P1633 Lexus — Engine Control Module Malfunction Electric Throttle Control System Circuit
• P1633 Lincoln — Keep Alive Power Voltage Too Low
• P1633 Mazda — Battery Voltage Overcharging
• P1633 Mercury — Keep Alive Power Voltage Too Low
• P1633 MINI — Throttle Valve Adaptation Limp-Home Position Unknown
• P1633 Saab — Engine Control Module Defective
• P1633 Toyota — Engine Control Module Malfunction Electric Throttle Control System Circuit
• P1633 Volkswagen — Accelerator Pedal Position Sensor 2 Signal Low Input
• P1633 Volvo — Vehicle Speed Signal

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 Code

1. What are the common symptoms of OBDII code P1633 (Keep Alive Power Voltage Too Low)?

The common symptoms include engine stalling, rough idling, poor vehicle performance, and difficulty starting the engine.

2. What are the possible causes of OBDII code P1633?

The code P1633 can be caused by a weak car battery, a faulty alternator, poor electrical connections, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the issue causing OBDII code P1633?

You can start by checking the car battery and alternator's voltage output, inspecting all relevant electrical connections for any corrosion or damage, and using a diagnostic scan tool to read the code and monitor live data.

4. Can a weak car battery cause OBDII code P1633 to appear?

Yes, a weak car battery can cause the Keep Alive Power (KAP) voltage to drop below the threshold, triggering code P1633.

5. What are some repair tips for fixing OBDII code P1633?

You can start by ensuring the car battery and alternator are in good working condition, checking and cleaning all electrical connections, and resetting the PCM to see if the code reappears.

6. Will driving with OBDII code P1633 damage my vehicle?

Continuously driving with code P1633 can potentially lead to further electrical issues and affect the overall performance of the vehicle. It is recommended to address the problem promptly.

7. Can a DIY enthusiast fix OBDII code P1633 at home?

Depending on the root cause of the code, some DIY enthusiasts may be able to fix it at home by checking and replacing the car battery, alternator, or repairing faulty connections.

8. Is it safe to drive my vehicle with OBDII code P1633 active?

It is not recommended to drive the vehicle with an active P1633 code as it can lead to potential stalling, poor engine performance, and other safety hazards on the road.

9. How much does it typically cost to repair OBDII code P1633 at a mechanic?

The repair cost for OBDII code P1633 can vary depending on the underlying issue, but it may range from $100 to $500 or more, including parts and labor.

10. Can resetting the PCM clear OBDII code P1633 permanently?

Resetting the PCM may temporarily clear the code, but if the underlying issue causing P1633 is not addressed, the code is likely to reappear. It is essential to diagnose and fix the root cause for a permanent solution.