Keep Alive Power Voltage Too Low
2012-2020 Ford Focus 2.0L I4 🇨🇦
Description
The PCM has detected that the Keep Alive Power (KAPWR) voltage is too low. This immediately illuminates the MIL and means the PCM cannot maintain its adaptive learning values. The KAM circuit should maintain battery voltage at all times.
Symptoms
- Check Engine Light (immediately on)
- Engine may not start
- Poor idle quality
- Harsh transmission shifts
- Loss of all adaptive values
Common Causes
- Corroded battery terminals or cables
- Faulty PCM power relay
- Blown KAM fuse
- Discharged battery
- Excessive parasitic draw depleting battery
- Wiring issue in KAPWR circuit
Diagnostic Steps
- Check battery voltage (should be >12.4V key off)
- Inspect battery terminals for corrosion
- Check KAPWR fuse
- Test PCM power relay
- Test KAPWR circuit voltage at PCM connector
- Check for parasitic battery draw
Repair Notes
Clean battery terminals. Replace KAPWR fuse. Replace battery if discharged. Repair wiring.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1633 on Other Vehicles
Common Questions
What does code P1633 mean on a 2012-2020 Ford Focus?
P1633 stands for "Keep Alive Power Voltage Too Low". The PCM has detected that the Keep Alive Power (KAPWR) voltage is too low. This immediately illuminates the MIL and means the PCM cannot maintain its adaptive learning values. The KAM circuit should maintain battery voltage at all times.
What are the symptoms of P1633 on a Ford Focus?
Common symptoms of P1633 include: Check Engine Light (immediately on), Engine may not start, Poor idle quality, Harsh transmission shifts, Loss of all adaptive values.
What causes P1633 on a 2012-2020 Ford Focus?
Common causes of P1633 include: Corroded battery terminals or cables, Faulty PCM power relay, Blown KAM fuse, Discharged battery, Excessive parasitic draw depleting battery, Wiring issue in KAPWR circuit.