Keep Alive Power Voltage Too Low

What it means

This is a Ford, Lincoln and Mercury code; the same number can mean something different on other makes. Keep alive memory (KAM) in the engine computer stores learned values such as fuel trim and idle, and it is powered straight from the battery through a fuse even with the car off. The code means that supply dropped or was cut, so the learned values were lost.

Models covered: Ford (and Lincoln/Mercury) models, mainly around 1996–2005.

Related codes: P0560P0562P0603P1000

Symptoms4

• Check engine light on.
• Rough idle or mild stalling after start until the computer relearns.
• Temporary change in shift feel on some models.
• P1000 stored with it because test results were erased.

Possible causes6

• Battery disconnected, replaced or fully drained.
• Loose or corroded battery terminals.
• Blown computer memory fuse.
• Open or corroded constant-power wire to the computer.
• Weak battery or a parasitic drain emptying it while parked.
• Internal engine computer fault (rare).

How to diagnose5

1. Ask whether the battery was recently disconnected or replaced, which explains a one-time code.
2. Inspect, tighten and clean the battery terminals.
3. Check the computer memory fuse per the manufacturer manual.
4. Measure constant voltage at the KAM power pin of the computer connector with the car off.
5. Test the battery and check for a parasitic drain if the code returns.

How to fix5

1. Clean and tighten the battery terminals.
2. Replace the blown fuse and find why it blew.
3. Repair the constant-power wire or its connector.
4. Replace a weak battery or fix the parasitic drain.
5. Clear the code and let the computer relearn with normal driving.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

Cleaning terminals or replacing a fuse is often enough; the cost reaches the top of the range for a battery or wiring repair, while a computer fault is rare and above the range.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions