R
p2181
Moderate
RAM · Trucks
Cooling System Performance
Quick Answer
Error code P2181 on your RAM Trucks means: Cooling System Performance. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
DTDSDRTXDUDVDDPMPC
Likely Causes
  1. Stuck thermostat not opening properly
  2. Low coolant level from leak
  3. Failing water pump
  4. Radiator airflow blockage
  5. Engine coolant temperature sensor error
How to Fix It
1
Monitor coolant temperature during engine warm-up with scanner
2
Inspect cooling system for leaks or low coolant
3
Feel radiator hoses for proper temperature progression
4
Check radiator fins for dirt or debris blockage
5
Replace thermostat or water pump if temperature regulation fails
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Thermostat assembly
Water pump
Coolant
Radiator hose kit
Radiator flush kit
Related Error Codes
Video Guides
Loading video guides…
Search more on YouTube →