P1633 1999 Ford F150 Code - Keep Alive Power Voltage Too Low
Quick Answer
The diagnostic trouble code P1633 for a 1999 Ford F150 indicates that the Keep Alive Power (KAPWR) voltage is too low. Common causes include Failing battery, Failing alternator, Wiring issues (corrosion, loose 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 1999 Ford F150 indicates Keep Alive Power Voltage Too Low .
- Common causes
- Common causes include Failing battery, Failing alternator, Wiring issues (corrosion, loose 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.
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Code P1633 1999 Ford F150 Description
The diagnostic trouble code P1633 for a 1999 Ford F150 indicates that the Keep Alive Power (KAPWR) voltage is too low. The Keep Alive Power is a crucial system in a vehicle that maintains power to the vehicle's computer systems when the engine is turned off. This power is necessary for the computer systems to retain important data and settings, such as fuel trim values, idle speed, and transmission shift points. When the voltage for the Keep Alive Power drops below the specified threshold, it can cause various issues with the vehicle's performance.
Common Causes of P1633 1999 Ford F150
- Failing battery
- Failing alternator
- Wiring issues (corrosion, loose connections)
- Faulty Keep Alive Power module
- Malfunctioning PCM
Symptoms of P1633 1999 Ford F150
- Rough idling
- Stalling
- Poor fuel efficiency
- Difficulty starting
- Drivability problems
How to Fix P1633 1999 Ford F150
- Check the battery and alternator for proper functioning and replace if necessary.
- Inspect the wiring for any corrosion or loose connections and repair as needed.
- Test the Keep Alive Power module and PCM for faults and replace if found to be malfunctioning.
- Clear the trouble code from the vehicle's computer system and reset any affected settings.
Cost to Fix P1633 1999 Ford F150
The typical repair costs for addressing the P1633 code on a 1999 Ford F150 can vary depending on the specific cause of the issue. In general, the cost of replacing a battery or alternator can range from $100 to $300, while fixing wiring issues may cost around $50 to $150. Replacing a faulty Keep Alive Power module or PCM can be more expensive, with costs ranging from $200 to $500 or more. Labor costs at auto repair shops can vary between $80 and $150 per hour, so it's advisable to check local rates for a more accurate estimate of the total repair costs.
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Frequently Asked Questions about P1633 1999 Ford F150 Code
What does the OBDII code P1633 mean for a 1999 Ford F150?
The P1633 code indicates that the Keep Alive Power (KAP) voltage is too low, meaning the PCM is not receiving consistent power from the battery to retain memory.
What are the symptoms of the P1633 code in a 1999 Ford F150?
Symptoms may include a check engine light, loss of stored PCM memory (like idle settings or fuel trims), and potential performance issues.
What causes the P1633 code in a 1999 Ford F150?
Common causes include a weak battery, a blown fuse, damaged wiring to the PCM, or a faulty PCM power relay.
Can a bad battery cause the P1633 code?
Yes, a weak or failing battery can cause insufficient power to the PCM, triggering the P1633 code.
How do I diagnose the P1633 code in a 1999 Ford F150?
Check the battery voltage, inspect fuses and wiring for damage, and verify that the PCM receives a constant 12V power supply with a multimeter.
Can driving with the P1633 code cause damage?
Driving with this code typically won't cause immediate damage but may result in poor performance or loss of vehicle settings over time.
How do I fix the P1633 code on my 1999 Ford F150?
Repairs may involve replacing a faulty battery, repairing damaged wiring, replacing blown fuses, or addressing issues with the PCM power relay.
Is the P1633 code related to the alternator?
Not directly, but a failing alternator could indirectly cause the issue if it prevents the battery from maintaining adequate voltage.
Can a reset of the PCM clear the P1633 code?
Resetting the PCM may temporarily clear the code, but the root cause needs to be fixed to prevent it from returning.
How much does it cost to fix the P1633 code on a 1999 Ford F150?
Costs depend on the cause, ranging from $10 for a fuse replacement to $200 or more for wiring repairs or a new battery.
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