The 2015 Express is a workhorse van built on GM's proven full-size platform, but the 6.0L V8 shows alarming engine longevity issues and the 4-speed transmission runs hot under load. The 4.3L V6 and 6.6L Duramax are far more durable choices.
6.0L V8 Vortec Piston and Ring Failure (AFM-equipped)
Common · high severity
Typical onset: 100,000-180,000 mi
Symptoms: Excessive oil consumption (1qt per 500-1000 miles), Blue smoke on startup or acceleration, Misfires on cylinders 1, 4, 6, or 7, Check engine light with P0300-series codes
Fix: Active Fuel Management (AFM) system causes piston scuffing and ring collapse, particularly on cylinders that cycle on/off. Requires full engine rebuild or short block replacement. 18-24 labor hours plus machine work if salvaging heads. AFM delete kit recommended during rebuild.
Estimated cost: $5,500-9,500
Transmission Oil Cooler Lines and Cooler Failure
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Transmission fluid in coolant (strawberry milkshake in overflow tank), Transmission slipping or delayed engagement, Overheating transmission temp warnings, Coolant in transmission pan
Fix: Factory cooler integrated into radiator develops internal leak, cross-contaminating fluids. Requires radiator replacement, transmission flush (often multiple flushes), and cooler line replacement. If driven after contamination, transmission rebuild needed. 6-8 hours for cooler/radiator work, add 12-16 hours if trans is damaged.
Estimated cost: $1,200-2,000 (catch early), $3,500-5,500 (if trans damaged)
4L80E Transmission Mount Failure
Common · medium severity
Typical onset: 60,000-110,000 mi
Symptoms: Clunk when shifting into drive or reverse, Vibration through floor at idle in gear, Visible drooping of transmission tailshaft, Transmission hits crossmember over bumps
Fix: Rubber transmission mount tears from weight and torque, especially in cargo or extended-length vans. Requires transmission support and mount replacement. Often coincides with deteriorated motor mounts. 2-3 hours labor.
Estimated cost: $300-550
Fuel Pump and Sender Assembly Failure (6.0L V8)
Occasional · high severity
Typical onset: 90,000-160,000 mi
Symptoms: Hard starting when fuel tank below 1/4, Stalling during acceleration or uphill, Fuel gauge reading erratically or stuck, Whining noise from fuel tank area
Fix: OEM fuel pump module develops cracked housing or failing sender float. Extended vans require tank lowering (major job due to length). Rear-wheel-well access on standard length. 3-5 hours depending on wheelbase.
Estimated cost: $800-1,400
EVAP Vent Valve Solenoid and Canister Failure
Occasional · low severity
Typical onset: 70,000-130,000 mi
Symptoms: Check engine light with P0449 or P0455 codes, Fuel tank difficult to fill (pump keeps clicking off), Fuel smell near passenger rear wheel, Failed emissions test
Fix: EVAP vent solenoid mounted behind passenger rear tire accumulates road salt and moisture, causing internal valve failure. Canister can also saturate from topping off tank. Located high on frame rail. 1.5-2 hours labor.
Estimated cost: $250-450
Rear Differential Pinion Seal Leak (3500-series with dual rear wheels)
Occasional · medium severity
Typical onset: 80,000-140,000 mi
Symptoms: Gear oil dripping from front of differential, Oil coating undercarriage behind differential, Low differential fluid on inspection, Whining noise from rear axle if run low
Fix: Pinion seal hardens and leaks, especially on vans used for towing. Requires driveshaft removal and seal replacement with pinion preload reset. Should replace pinion bearing if any play detected. 3-4 hours labor.
Estimated cost: $450-750
Throttle Body Carbon Buildup and Relearn Issues
Occasional · low severity
Typical onset: 50,000-100,000 mi
Symptoms: Rough idle especially when cold, Surging idle between 500-900 RPM, Check engine light with P0507 (idle too high), Stalling when coming to stop
Fix: Carbon buildup on throttle plate prevents proper closure. Requires throttle body removal and cleaning, followed by idle relearn procedure with scan tool. Sometimes triggers reduced power mode. 1.5 hours labor.
Estimated cost: $180-320
Owner tips
If buying a 6.0L V8, verify oil consumption history and avoid AFM-equipped engines with over 120k miles unless rebuild is documented
Inspect transmission cooler lines and check coolant for any discoloration at every oil change — catching cross-contamination early saves the transmission
Install auxiliary transmission cooler if using for towing or cargo over 4,000 lbs regularly — factory cooling is marginal
The 4.3L V6 is underpowered but reliable; the 6.6L Duramax is bulletproof if maintained but adds $8k-12k to purchase price
Buy a 4.3L V6 or Duramax version with service records; avoid 6.0L V8 models with unknown history past 100k miles unless priced for an engine rebuild.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Side post terminals standard for GM full-size vans
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Every control module on the 2015-2025 Chevrolet Express — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
📍 6L80/6L90: integrated with valve body inside transmission (TEHCM). 8L90: integrated with valve body inside transmission (TEHCM). Allison 1000: external on driver side of transmission case
🔧 GDS2 + MDI2 or J2534 + ACDelco TDS
⚠️ 6L/8L TEHCM requires transmission removal. VIN and calibration programming required. Security gateway from 2017+.
Electric Power Steering Control Module (EPSCM)2.5 hr R&Rdealer / factory tool +0.5 hr2019+ models with electric power steering▸ programming details
📍 Integrated with steering column assembly, below dashboard
📍 Integrated into rear camera assembly above license plate
🔧 GDS2 + MDI2 or aftermarket scan tool
⚠️ Camera and module integrated. Video signal to radio. Configuration may be required for guidelines.
Tire Pressure Monitor Control Module (TPMS)relearn only +0.2 hr▸ programming details
📍 Integrated within BCM
🔧 GDS2 + MDI2 or TPMS relearn tool
⚠️ Sensor IDs must be relearned after tire rotation or sensor replacement. No separate module R&R.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
VISIBILITY:POWER WINDOW DEVICES AND CONTROLS · 18V295000
2018-05-03
General Motors LLC (GM) is recalling certain 2014-2017 Chevrolet Express and GMC Savana vehicles equipped with power windows. Liquid may leak into the driver's power window switch and cause corrosion, resulting in high electrical resistance.
Consequence: High electrical resistance can increase the risk of a fire.
Remedy: GM will notify owners, and dealers will replace the driver side window switch, free of charge. The recall began August 10, 2018. Owners may contact Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is 18155.
EQUIPMENT · 18V267000
2018-04-26
General Motors LLC (GM) is recalling certain 2009-2014 Chevrolet Silverado HD and GMC Sierra HD, 2009 GMC Topkick 5000, 6000, 7000 and 8000 Series and Isuzu F Series, and 2009-2018 Chevrolet Express, and GMC Savana vehicles, equipped with certain Plastic-Handle Fire Extinguishers or Push Button 'Pindicator' Fire Extinguishers. These extinguishers may become clogged, preventing the extinguisher from discharging as expected or requiring excessive force to activate the extinguisher. Additionally, in certain models, the nozzle may detach from the valve assembly with enough force that it could cause injury and also render the product inoperable. For a full list of the affected fire extinguisher models visit: https://static.nhtsa.gov/odi/rcl/2017/RMISC-17E062-5427.pdf
Consequence: In the event of a fire, if the fire extinguisher does not function properly, it can increase the risk of injury.
Remedy: GM will notify owners, instructing them to contact Kidde to get a replacement fire extinguisher, free of charge. The recall began June 11, 2018. Owners may contact Chevrolet customer service at 1-800-222-1020, GMC customer service at 1-800-462-8782, and Isuzu customer service at 1-866-441-9638. GM's number for this recall is 18146.
TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS · 16V184000
2016-04-01
General Motors LLC (GM) is recalling certain model year 2014-2016 Chevrolet Express and GMC Savana incomplete vehicles equipped with a 159 inch wheel base manufactured August 2, 2013, to January 30, 2016. The affected vehicles were shipped to final stage manufacturers without a tire pressure monitoring system (TPMS). As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 138, "Tire Pressure Monitoring Systems."
Consequence: Without a TPMS, the driver would not be alerted if one or more tires became under inflated. Driving with under inflated tires increases the risk of a crash.
Remedy: GM will notify owners, and dealers will install the hardware and software necessary to equip the vehicles with a TPMS, free of charge. The recall began on May 25, 2016. Owners may contact Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782. GM's number for this recall is 15819.
Wiper blades
Full-size cargo/passenger van, no rear wiper. Both blades same length.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2015 Chevrolet Express 4.3L V6 Vortec and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.