P1633 1999 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 1999 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.
Code P1633 1999 Ford F150 Description
What are the Possible Causes of the DTC P1633 1999 Ford F150?
- Open Keep Alive Power (KAPWR) circuit
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1633 1999 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 1999 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.
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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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