P0217 on Chevrolet: How to Diagnose & Fix
Engine Overtemperature Condition
2 Chevrolet models · 2 documented issues · 1 critical · $900-$4,500 repair
P0217 on Chevrolet by model: symptoms, diagnosis and fix
C7 Z06 models with the supercharged 6.2L LT4 overheat and enter a reduced-engine-power mode when driven at sustained high speed on a road course in warm ambient temperatures. The factory cooling package is undersized for the LT4's heat rejection: the supercharger uses only two intercooler bricks, and the engine radiator, charge-air cooler circuit and oil cooler all saturate within a few minutes of hard lapping. Owners report having to pit and cool down mid-session, with the car noticeably slowing as the ECU pulls timing and then derates. GM formally acknowledged the condition with Special Coverage Adjustment N202302720, covering 2015-2016 Z06 with the MEK manual and 2015-2018 Z06 with the M5U 8-speed automatic. This is specific to the supercharged LT4 Z06 - the naturally aspirated LT1 Stingray and Grand Sport do not share this cooling deficit.
Common Symptoms
- Reduced engine power warning after several hard laps
- Coolant and intake air temperatures climbing without stabilizing on track
- Noticeable power loss after consecutive wide-open-throttle pulls
- Having to pit and idle to cool the car before continuing a session
- Elevated engine oil temperature
How to Fix
Have the dealer perform Special Coverage Adjustment N202302720 (7 years / 72,000 miles from in-service date, regardless of ownership). The remedy is an upgraded radiator package plus, on automatic cars, updated shift-point calibration software. GM requires customer evidence of the overheat - a stored diagnostic trouble code, photos, or video of the gauge cluster and reduced-power message. Only about 5% of covered cars were expected to need parts, so document the condition before the visit. For owners who track the car regularly and are outside coverage, the durable fix is an upgraded heat-exchanger/intercooler package - a triple-brick supercharger intercooler, relocated outboard coolers to free up radiator airflow, and a front-mounted air-to-oil cooler. Note that a conservative factory ECU calibration also pulls significant timing as intake air temperature climbs, so cooling hardware, not tuning alone, is the correct fix.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (3)
The engine-driven water pump bearing and shaft seal wear out, leaking coolant from the weep hole and eventually letting the impeller wobble or the bearing seize. Coolant loss leads to overheating if ignored.
Common Symptoms
- Coolant puddle / drip from front of engine
- Rising temperature gauge / overheating
How to Fix
Replace the water pump with an OE-quality unit (ACDelco / GM Genuine or Aisin/Gates equivalent) and fresh dexos-approved coolant; inspect the belt, tensioner and thermostat while there. Pressure-test the system afterward to confirm no residual leaks.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Engine Water PumpCross-refDP990
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (2)
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 Chevrolet?
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 Chevrolet it is documented across 2 models: Corvette, Tahoe.
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 Chevrolet?
Published repair estimates on Chevrolet range from $900 to $4,500 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.