DeWalt Power Tool Error Code 4: How to Fix It
Hard 30-60 minutes Medium Severity
Verified June 2026
- Error Code
- 4
- Brand
- DeWalt
- Product Type
- power_tool
- Severity
- Medium
- DIY Difficulty
- Hard
- Estimated Fix Time
- 30-60 minutes
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Tools You'll Need
- Multimeter
- Small flathead screwdriver
- Variable power supply or hobby balance charger (e.g., LiPO charger)
- Insulated gloves
- Safety glasses
How to Fix Error Code 4
-
Safety First: Disconnect and Inspect
If the battery is swollen or leaking, do not attempt to repair. Replace the entire battery pack immediately to avoid fire or explosion risk. -
Measure Individual Cell Voltages
Discharge the battery to below 50% charge before disassembly to reduce risk of short circuits. Wear insulated gloves. -
Balance the Cells
Never overcharge lithium-ion cells. Monitor temperature; if cells become hot, stop immediately. -
Reassemble and Test
Do not use the tool if error persists or if any cell shows abnormal voltage drop under load.
Parts You May Need
Replacement battery pack (if faulty)
Check Price on Amazon
18650 lithium-ion cells (if rebuilding)
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Replacement battery pack (if faulty)
Check Price on Amazon
18650 lithium-ion cells (if rebuilding)
Check Price on Amazon
Replacement battery pack (if faulty)
Check Price on Amazon
18650 lithium-ion cells (if rebuilding)
Check Price on Amazon
Replacement battery pack (if faulty)
Check Price on Amazon
18650 lithium-ion cells (if rebuilding)
Check Price on Amazon
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When to Call a Professional
If you are uncomfortable disassembling the battery pack, if cells show physical damage, or if balancing does not resolve the error, replace the battery pack. For tools still under warranty, contact DeWalt service.Frequently Asked Questions
What does error code 4 mean on my DeWalt tool?
Error code 4 indicates a battery cell imbalance – the cells inside the battery pack have different voltage levels, preventing safe operation.
Can I fix a DeWalt battery with error code 4?
Yes, in many cases you can fix it by balancing the cells with a charger. If the battery is physically damaged or cells are bad, replacement is recommended.
Why do DeWalt batteries get cell imbalance?
Cell imbalance can occur due to age, deep discharges, charging at extreme temperatures, or defective cell groups.
Is it safe to keep using a DeWalt battery with error code 4?
No. The error is a safety feature to prevent overheating or fire. Stop using the battery and address the imbalance.
Will charging a DeWalt battery fix error code 4?
Sometimes. If the imbalance is slight, a full charge may balance cells. If not, manual balancing is needed.