P0217 on GMC: How to Diagnose & Fix
Engine Overtemperature Condition
2 GMC models · 2 documented issues · 1 critical · $400-$1,443 repair
P0217 on GMC by model: symptoms, diagnosis and fix
The factory water pump on 6.6L Duramax engines (LBZ, LMM, LML, L5P) is known to develop weep hole leaks and bearing failures, resulting in coolant loss and potential overheating. The plastic impeller on earlier units can also separate from the shaft, causing sudden loss of coolant circulation. GM issued TSB 07-06-02-002 addressing water pump replacement procedures for LBZ/LMM applications.
Common Symptoms
- Coolant puddle under front center of engine
- Weep hole dripping coolant from water pump body
- Engine overheating warning or high coolant temperature
- Squealing or grinding noise from front of engine
- Low coolant level warning light
How to Fix
Replace water pump assembly with updated steel impeller unit (ACDelco 251-2088 or Delphi WP10162). Flush and refill cooling system with Dex-Cool compliant coolant. Inspect thermostat and housing for related damage. Aftermarket options from Mishimoto and Aisin offer improved longevity. Repair requires serpentine belt removal; 2–4 hours labor.
Sources for this issue (1)
The engine-driven water pump develops bearing/impeller wear or seal leaks, allowing coolant to weep (often visible as dried Dex-Cool on the timing-chain cover or flung from the pump pulley) and eventually causing overheating. On both the 2.4L Ecotec and 3.6L V6, the pump is timing-chain-cover-mounted, making replacement labor-intensive and comparatively expensive. Neglecting a leaking pump can damage timing components.
Common Symptoms
- Coolant leak / puddle under front of vehicle
- Engine overheating
- Low coolant warning
- Whining or grinding from water pump
- Sweet coolant smell
How to Fix
Replace the water pump (OEM/ACDelco) along with the coolant and inspect the thermostat and hoses. Given the timing-cover location, professional replacement is recommended; refill and bleed the cooling system afterward.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Engine Water PumpCross-refWPGM-700
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
P0217 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0217 mean on a GMC?
P0217 stands for "Engine Overtemperature Condition." This code sets when the engine control module detects that the engine has exceeded its safe operating temperature, meaning the engine is overheating based on the coolant temperature sensor reading. Because excessive heat can warp the cylinder head, blow the head gasket, or seize the engine, the computer flags this condition and may reduce power to protect the engine. It generally indicates a real cooling system problem rather than just a sensor glitch, though a faulty sensor can occasionally cause a false reading. An overheating engine should be stopped as soon as it is safe to avoid serious damage. On GMC it is documented across 2 models: Sierra 3500HD, Terrain.
What are the most common causes of P0217?
The most common causes of P0217 are: Low coolant level or a leak in the cooling system, Stuck-closed thermostat, Failed water pump, Faulty radiator cooling fan or fan circuit, Clogged or blocked radiator, Faulty coolant temperature sensor giving a false high reading, Head gasket failure or combustion gases in the coolant, Air pocket in the cooling system after service. The specific cause varies by vehicle.
How much does it cost to fix P0217 on a GMC?
Published repair estimates on GMC range from $400 to $1,443 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0217 on a different make?
View P0217 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.