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2018 GMC Sierra 1500 · Water pump replacement
2018 GMC Sierra 1500 water pump replacement cost
A 2018 GMC Sierra 1500 water pump replacement typically costs $335 to $700 at an independent shop, parts and labor included across its engine options. The water pump itself runs $110 to $240, and the job takes 2 to 4 hours. Prices updated September 2026.
Estimated cost, selected engine
$335 to $700
Charlotte, NC area
Prices updated September 2026
Which engine? They price differently, so pick yours for a closer number.
Water pump (part)
$110 to $240
Labor (2 to 4 hours)
$200 to $400
Fluids + supplies
$25 to $60
2018 GMC Sierra 1500 water pump replacement: parts and labor
Labor runs $200 to $400 (the job takes 2 to 4 hours at typical independent-shop rates), and the water pump itself typically costs $110 to $240 for the 2018 GMC Sierra 1500, plus $25 to $60 in dex-cool 50/50 (1-2 gal) + shop supplies. Prices updated September 2026.
| Engine | Parts | Labor | Estimated total |
|---|---|---|---|
| 4.3L V6 | $110 to $240 | $200 to $400 (1.5 to 2.5 hrs) | $335 to $700 |
| 5.3L V8 | $110 to $240 | $200 to $400 (1.5 to 2.5 hrs) | $335 to $700 |
| 6.2L V8 | $110 to $240 | $200 to $400 (1.5 to 2.5 hrs) | $335 to $700 |
Coverage note: None excluded: the 4.3L, 5.3L, and 6.2L cover the full 2018 US Sierra 1500 lineup and all share one pump. The eAssist mild-hybrid 5.3L was a rare 2016 to 2017 fleet/CA offering, effectively gone from the 2018 Sierra, and used the same L83 pump anyway, so it is not broken out.
RepairPal shows $956 to $1,591 for the 2018 Sierra 1500 ($761 to $1,305 parts alone) and $1,129 to $1,543 across all years; that reflects genuine GM parts at dealer list price plus dealer-tier labor, roughly 2x to 3x what an independent pays for a Gates, Aisin, or ACDelco Gold pump at $49 to $84 retail. YourMechanic's $352 average and KBB's $375 to $787 for the 2018 Crew Cab confirm the real-world independent range; expect a GM dealer using the genuine assembly to land around $700 to $1,100.
Where these numbers come from
- Estimate ranges: a hand-verified research pass for this exact vehicle and repair, cross-referenced across 10 independent sources (parts retailers, labor guides, and published shop pricing), completed September 2026.
- Recall and complaint data: NHTSA (National Highway Traffic Safety Administration) records for the 2018 GMC Sierra 1500 specifically, filtered to cooling system relevance and refreshed daily from the federal API.
- Local prices: real, accepted quotes from verified Fixxr marketplace jobs, published per metro once five verified jobs of this type have closed. Never estimates dressed up as transactions.
Not included in the estimate: Thermostat and housing replacement (commonly added while the system is drained; roughly $60 to $165 more in parts), Full cooling system flush or complete Dex-Cool exchange (only a partial drain and refill is included), Radiator, radiator hoses, heater hoses, or surge tank if found leaking during the job, Serpentine belt and tensioner replacement, Diagnosis of overheating from other causes (head gasket, fan module, clogged radiator), Taxes, shop fees, and disposal charges.
What actually goes wrong on this exact vehicle
Federal safety data for the 2018 GMC Sierra 1500, filtered to the cooling system specifically.
0
cooling system recalls
6
cooling system owner complaints
Real owner report, verbatim from NHTSA:
“The contact owns a 2018 GMC Sierra 1500. While starting the vehicle, it was shaking violently, with reduced power. The vehicle was restarted and worked as designed. Upon research, the contact associated the failure with NHTSA Action Number: PE25001 (Engine and Engine and Cooling). The vehicle was taken to an independent mechanic who determined there was metal in the engine, and there was a misfire coming from cylinder #2. The mechanic recommended that the engine be replaced. There were loose wires from the ECM, and the failure halted after the mechanic secured the wires. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The approximate failure mileage was 150,000.”
Worth knowing: the radiator is one of the most common causes of overheating, alongside the thermostat, water pump, and hoses. Get the real source confirmed before you approve any repair, so you fix the part that actually failed.
Recall fixes are free at the dealer. Everything else deserves a fair price.
Source: NHTSA (National Highway Traffic Safety Administration), recalls and complaints for the 2018 GMC Sierra 1500. Refreshed periodically.
Not sure what’s wrong?
Overheating can be the radiator, thermostat, water pump, or a leak. Describe what your car is doing and our free diagnostic tool narrows it down before you spend a dollar.
Diagnose it freeKnow what you need?
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Get connected with a mechanicHow your cooling system works
The water pump is one piece of a loop. Here is how the parts work together, so you understand exactly what your car is doing and why.
Found a puddle? What the color tells you
Bright green
Classic coolant leak. Find the source before it overheats.
Orange / pink
What most modern vehicles use (OAT). Same urgency as green.
Rusty brown
Old, corroded coolant. Overdue for a flush.
Milky / oily
Coolant mixing with oil, like a coffee milkshake. Can mean a head gasket. Serious.
What a water pump replacement is like on the 2018 GMC Sierra 1500
All three 2018 Sierra 1500 engines are Gen V EcoTec3 small blocks (4.3L LV3 V6, 5.3L L83 V8, 6.2L L86 V8) and they bolt on the exact same water pump. RockAuto's 2018 catalogs for the 4.3L, 5.3L, and 6.2L list identical parts at identical prices: US Motor Works US8918 at $48.79, Gates 42200 at $64.79, GMB 130-3020 at $64.89, Dayco DP2232 at $65.79, Aisin WPGM606V at $77.89, and ACDelco Gold 252-1027 at $83.79. That is why the three rows match; what actually moves your bill is the shop's labor rate and parts markup, not which engine is under the hood. 2WD versus 4WD makes no difference either, since the pump sits on the front of the engine well above the front diff.
This K2XX-generation truck is one of the cheaper GM pickups to do a water pump on because it uses dual electric cooling fans, so there is no mechanical fan clutch to wrestle off the pump snout the way there was on 2007 to 2013 GMT900 trucks. The job is drain the radiator, pull the serpentine belt, hold the pump pulley to break its four bolts loose, then unbolt the pump from the front cover. Flat-rate references for the 5.3L full-size trucks run 1.6 to 1.8 book hours, and a 2015 Silverado 1500 5.3L was quoted at 1.6 hours; independents commonly bill 1.5 to 2.5 clock hours once coolant fill and burp time is included.
On the EcoTec3 engines the thermostat lives in a separate housing on the pump inlet rather than inside the pump, and many shops sell the pump and thermostat together since you are already draining Dex-Cool. US Motor Works sells that exact combo (pump + thermostat + housing, US8918T) for $140.79, or $163.79 with the coolant temperature sensor (US8918TS). If your quote is a couple hundred dollars over the ranges here, check whether it includes the thermostat kit and a full coolant exchange rather than assuming you are being gouged.
These trucks take orange Dex-Cool only; total system capacity on the 5.3L is around 11.5 quarts, but a pump swap only drops a portion of it, so a typical shop invoice shows 1 to 2 gallons of 50/50 premix. Typical failure on the L83 and its siblings is seepage from the weep hole or a growling pulley bearing, most often showing up in the 90k to 150k mile range these 2018s are hitting now. Do not let a shop top it with green universal coolant; mixed coolant sludge in a Gen V is a much bigger bill than the pump.
RepairPal's 2018-specific estimate of $956 to $1,591 assumes $761 to $1,305 in parts, which is dealer-list math for the genuine GM assembly (the 2014 to 2018 GM pump/housing is referenced under AC Delco 12685257) plus related hardware at full list; the actual pump retails for $49 to $84 aftermarket. KBB's $375 to $787 for a 2018 Crew Cab and YourMechanic's $720 estimate on the near-identical 2017 5.3L bracket what independents really charge, which is why this estimate lands at $335 to $700.
Estimate note: these are researched independent-shop ranges, not a guaranteed quote. The only exact number is one from a shop that has seen your car.
Frequently asked questions
How much does a 2018 GMC Sierra 1500 water pump replacement cost?
A 2018 GMC Sierra 1500 water pump replacement typically runs $335 to $700 at an independent shop, parts and labor included. The water pump itself is $110 to $240, labor makes up most of the rest, and the job takes 2 to 4 hours.Why does the price change with the engine?
The 2018 GMC Sierra 1500 came with more than one engine, and they do not share the same part or the same access. A tighter engine bay or extra teardown adds labor hours, and the part price moves too. Sites that show one national number flatten that out. Pick your engine on the estimate above for a closer figure.Is it always the water pump when my GMC overheats?
No. Overheating can also be a stuck thermostat, a clogged or leaking radiator, a failed cooling fan, or simply low coolant. What points specifically at the water pump is coolant dripping from the weep hole under the pump, a grinding or whining noise from the front of the engine, or wobble in the pump pulley. Because these causes look identical from the driver's seat, get a real diagnosis before approving the repair.Can I drive my GMC with a bad water pump?
Only far enough to get it looked at. A failing pump stops circulating coolant, the engine overheats, and driving an overheating GMC risks a warped cylinder head or a blown head gasket, a $3,000 to $8,000 repair on top of the pump. If the temperature gauge climbs or you see steam, pull over and let it cool. If it keeps overheating, tow it.Should the thermostat be replaced at the same time?
Usually yes, and most shops will suggest it. The cooling system is already drained and opened for the water pump, so the thermostat adds only a small part cost with little extra labor, and a stuck thermostat is one of the most common follow-on failures. Replacing both in one visit avoids paying the teardown labor twice.How long does a water pump last?
Most factory water pumps last roughly 100,000 to 150,000 miles. The usual failures are the shaft seal, which starts seeping coolant from the weep hole, and the bearing, which gets noisy before it lets go. Regular coolant changes protect the seal and are the cheapest way to extend pump life.Are there recalls on the 2018 GMC Sierra 1500?
Yes, NHTSA lists 7 recalls for the 2018 GMC Sierra 1500. Recall repairs are done free of charge at a franchised dealer for that brand, so it is worth checking your VIN before paying a shop for related work.
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