Insufficient Coolant Temp for Closed Loop
The POWERSTROKE-P0125 (Power Stroke) diesel fault code means: Insufficient Coolant Temp for Closed Loop. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- intermediate
- Estimated cost
- $150-$400
Down with a Power Stroke fault on the road?
Get connected with a verified mobile diesel mechanic near you. Verified diesel & reefer techs, launching on the freight corridor.
Find a mobile mechanic →A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- CEL
- Slow warm-up
Probable Causes (Ranked by Likelihood)
- Stuck thermostat(s) Likely
Step-by-Step Diagnostic Procedure
Replace thermostats.
Frequently Asked Questions
What is P0125 on a 6.7L Power Stroke (Scorpion)?
P0125 on a 6.7L Power Stroke (Scorpion) (2011-present) indicates: Insufficient Coolant Temp for Closed Loop. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.
Can I drive with P0125 on my Power Stroke?
Yes, you can generally drive with this code, but diagnose it soon to prevent further damage.
How much does it cost to fix P0125?
Repair cost is typically $150-$400 depending on the underlying cause and whether you DIY or use a shop. Diagnostic time alone runs $100-$180 at most independent diesel shops.
P0125 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: