Mercedes-Benz P1244 Error Code: How to Fix It

Medium 2-4 hours High Severity Verified June 2026
Error Code
P1244
Brand
Mercedes-Benz
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
2-4 hours
The Mercedes-Benz P1244 error code indicates an engine harness fault, typically caused by damaged wiring, loose connections, or corroded terminals in the engine wiring harness. This high-severity code can cause poor engine performance, rough idling, or complete engine shutdown if not addressed promptly.
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Tools You'll Need

How to Fix Error Code P1244

  1. Ensure Vehicle Safety

    Never work on electrical components with the engine running or battery connected. Allow engine to cool to prevent burns from hot components.
  2. Connect OBD2 Scanner

  3. Locate the Engine Wiring Harness

  4. Visual Inspection of Wiring

  5. Check All Connections

  6. Test Harness Continuity

  7. Clean Corroded Connections

  8. Repair or Replace Damaged Components

    Use only automotive-grade wire and connectors. Improper repairs can cause fires or additional electrical problems.
  9. Reconnect and Test

  10. Monitor for Code Return

Parts You May Need

OBD2 diagnostic scanner
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Engine wiring harness section
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Electrical connectors
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Automotive electrical wire
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OBD2 diagnostic scanner
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Engine wiring harness section
Check Price on Amazon
Electrical connectors
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Automotive electrical wire
Check Price on Amazon
OBD2 diagnostic scanner
Check Price on Amazon
Engine wiring harness section
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive electrical wire
Check Price on Amazon
OBD2 diagnostic scanner
Check Price on Amazon
Engine wiring harness section
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive electrical wire
Check Price on Amazon
OBD2 diagnostic scanner
Check Price on Amazon
Engine wiring harness section
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive electrical wire
Check Price on Amazon
OBD2 diagnostic scanner
Check Price on Amazon
Engine wiring harness section
Check Price on Amazon
Electrical connectors
Check Price on Amazon
Automotive electrical wire
Check Price on Amazon
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When to Call a Professional

Contact a qualified Mercedes-Benz technician if you find extensive harness damage requiring major replacement, if the code persists after repairs, or if you're uncomfortable working with automotive electrical systems. Professional diagnosis may be needed if multiple related codes are present or if the harness damage is in hard-to-reach areas.

Frequently Asked Questions

Can I drive my Mercedes with P1244 error code?
It's not recommended to drive with P1244 as it indicates an engine harness fault that can cause unpredictable engine behavior, stalling, or complete shutdown. Have it diagnosed and repaired immediately.
How much does it cost to fix Mercedes P1244 error?
Repair costs vary from $200-800 depending on the extent of harness damage. Simple connector cleaning may cost $200-300, while major harness replacement can cost $500-800 including labor.
What causes Mercedes P1244 engine harness faults?
Common causes include rodent damage to wires, corrosion from moisture intrusion, chafing against engine components, heat damage from exhaust proximity, and normal wear from engine vibration over time.
Will P1244 cause my Mercedes to fail inspection?
Yes, P1244 is a high-severity code that will typically cause your vehicle to fail emissions testing and safety inspections until properly repaired and the code is cleared.
How do I prevent future P1244 errors in my Mercedes?
Regular maintenance includes checking for loose engine covers that might allow rodent access, ensuring proper harness routing away from heat sources, and having electrical connections inspected during routine service.