Engine Coolant Over Temperature Condition
The DURAMAX-P0217 (Duramax) diesel fault code means: Engine Coolant Over Temperature Condition. This is a critical severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- advanced
- Estimated cost
- $200 for a thermostat, $400-$900 for water pump, $3,500-$6,500 for head gaskets
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View pilot availability →What Are the Symptoms of DURAMAX-P0217?
- Coolant temperature gauge in red / overheating warning
- Coolant loss, steam from hood
- Engine derate or shutdown under load (especially on LLY)
- Sweet coolant smell (head gasket)
What Causes DURAMAX-P0217? (Most Likely First)
- Head gasket failure — common on LLY due to restrictive intake and overheating history Likely
- Failed water pump Likely
- Plugged radiator / restricted airflow Possible
- Stuck-closed thermostat(s) Possible
- Cavitation damage to liners (high-mile engines) Less Likely
Can I Still Drive with DURAMAX-P0217?
No — stop driving. DURAMAX-P0217 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
What is P0217 on a Duramax?
Duramax code P0217 (Engine Coolant Over Temperature Condition) is a critical-severity diagnostic trouble code triggered by the engine control module when it detects a problem in the associated system. On LLY Duramax engines (2004.5-2005), P0217 is often the first warning of head gasket failure caused by the restrictive stock intake horn.
Is a Duramax P0217 safe to drive?
No. Stop driving immediately once temperature exceeds safe limits. Continued operation will warp heads, burn head gaskets, and potentially crack the block.
How much does it cost to fix P0217 on a Duramax?
Ranges from $200 (thermostat) to $6,500 (head gaskets). LLY head gasket repairs often include an intake horn upgrade to prevent recurrence.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose DURAMAX-P0217?
Pressure test the cooling system to check for external or internal leaks
Perform a combustion gas test (block tester) on the coolant to check for head gasket leak
Inspect the water pump weep hole for coolant seepage
Check for a plugged radiator and proper fan clutch operation
Towing heavy loads with the LLY? An aftermarket intake horn mod is a common permanent fix to prevent recurrence
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P0217 as a generic OBD-II code)
P0217 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Which Vehicles Commonly Get DURAMAX-P0217?
- 2001-2004 Chevy Silverado 2500/3500 HD 6.6L Duramax LB7
- 2001-2004 GMC Sierra 2500/3500 HD 6.6L Duramax LB7
- 2004.5-2005 Chevy Silverado 2500/3500 HD 6.6L Duramax LLY
- 2004.5-2005 GMC Sierra 2500/3500 HD 6.6L Duramax LLY
- 2006-2007 Chevy Silverado 2500/3500 HD 6.6L Duramax LBZ
- 2006-2007 GMC Sierra 2500/3500 HD 6.6L Duramax LBZ
- 2007.5-2010 Chevy Silverado 2500/3500 HD 6.6L Duramax LMM
- 2007.5-2010 GMC Sierra 2500/3500 HD 6.6L Duramax LMM
- 2011-2016 Chevy Silverado 2500/3500 HD 6.6L Duramax LML
- 2011-2016 GMC Sierra 2500/3500 HD 6.6L Duramax LML
- 2017+ Chevy Silverado 2500/3500 HD 6.6L Duramax L5P
- 2017+ GMC Sierra 2500/3500 HD 6.6L Duramax L5P
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