The 2018 Silverado 1500 with GM's Gen V EcoTec3 engines is generally solid, but the 5.3L and 6.2L V8s suffer from a critical Active Fuel Management (AFM/DFM) defect causing catastrophic engine failures, plus transmission cooler line leaks are endemic across all powertrains.
Active Fuel Management (AFM) Lifter and Camshaft Failure - 5.3L/6.2L V8
Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Check engine light with P0300-P0308 misfire codes and P0521 oil pressure codes, Loud ticking/tapping from engine that gets worse with RPM, Metal shavings in oil, sudden oil consumption, Complete loss of power, engine knocking before catastrophic failure
Fix: AFM lifters collapse, wiping out camshaft lobes and pushing debris through the oil system. Requires complete engine teardown or replacement. Short block swap runs 25-35 labor hours, full rebuild 30-40 hours depending on damage extent. Many techs recommend AFM delete kit during repair to prevent recurrence.
Estimated cost: $6,500-12,000
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 50,000-100,000 mi
Symptoms: Transmission fluid dripping near radiator or under truck, Pink/red fluid puddles after parking, Low transmission fluid warning, slipping shifts if fluid level drops significantly, Visible corrosion or wetness on cooler lines at crimped connections
Fix: The steel cooler lines rust through at crimped joints or corrode where they connect to the radiator. Both lines typically need replacement together. 2-3 hours labor, must drop skid plate and sometimes exhaust heat shield. Aftermarket stainless lines are available as upgrade.
Estimated cost: $400-750
8-Speed Automatic Transmission (8L90) Shudder and Harsh Shifting
Common · medium severity
Typical onset: 30,000-80,000 mi
Symptoms: Shudder or vibration during light acceleration between 25-50 mph, Harsh 1-2 or 2-3 upshifts, especially when cold, Delayed engagement into drive or reverse, Transmission slipping feeling under load
Fix: Torque converter clutch shudder from inadequate fluid friction properties or valve body wear. GM issued multiple TSBs and fluid updates. Start with complete fluid/filter service using latest Mobil1 LV ATF HP spec (3-4 hours). If shudder persists, torque converter replacement runs 8-12 hours. Some cases need valve body or complete transmission replacement.
Estimated cost: $400-5,500
Electric Power Steering Assist Motor Failure
Occasional · high severity
Typical onset: 70,000-130,000 mi
Symptoms: Sudden loss of power steering assist, heavy steering wheel, Service power steering warning message on DIC, Grinding or whining noise from steering column area, Intermittent assist loss that returns after restart
Fix: The electric assist motor on the column fails internally, often due to water intrusion or bearing wear. Requires steering column R&R and motor replacement. 3-5 hours labor depending on cab configuration. GM extended warranty on some units but 2018 often falls outside coverage.
Estimated cost: $900-1,600
Vacuum Brake Booster Check Valve / Brake Assist Loss
Occasional · high severity
Symptoms: Hard brake pedal, increased stopping effort required, Hissing sound near brake pedal area, Check engine light with P0174/P0171 lean codes (vacuum leak), Rough idle or stalling in some cases
Fix: The vacuum check valve on the brake booster fails or the booster itself develops internal leaks. This was subject to NHTSA recalls for some VINs. Check valve replacement is 0.5-1 hour, full booster swap is 2-3 hours. Verify recall status before purchasing parts.
Estimated cost: $150-650
Fuel Pump Control Module Failure
Occasional · medium severity
Typical onset: 40,000-90,000 mi
Symptoms: No start condition, cranks but won't fire, Intermittent stalling while driving, typically when fuel tank below half, Check engine light with P0087 low fuel pressure code, Fuel pump not priming on key-on
Fix: The fuel pump control module (mounted above spare tire or inside frame rail) fails due to corrosion or internal circuit failure. Module replacement is 1-2 hours including diagnosis. Separate issue from actual fuel pump failure. Some techs coat replacement module connections with dielectric grease for longevity.
Estimated cost: $400-700
Air Bag Side Curtain Inflator Defect
Rare · high severity
Symptoms: Air bag warning light illuminated, No obvious symptoms until deployment event, Potential for over-pressurization during crash (safety risk)
Fix: NHTSA recall for side curtain air bag inflators that may rupture or improperly deploy. Dealer-only repair, typically 2-4 hours per side for curtain module replacement. Critical safety recall - check VIN status before purchase and ensure completion.
Estimated cost: $0 (recall repair)
Owner tips
If buying a 5.3L or 6.2L V8, have a pre-purchase inspection specifically check for AFM lifter tick and request oil analysis for metal content - walk away if present
Budget for AFM delete kit ($1,500-2,500 installed) proactively if keeping long-term with V8 - it's cheaper than engine replacement
Service transmission fluid at 50k intervals with GM-spec Mobil1 LV ATF HP to minimize 8L90 shudder issues
Inspect transmission cooler lines annually for rust, especially in salt-belt states - catch leaks early
Verify all NHTSA recalls completed, particularly brake booster and air bag inflator recalls, before purchase
Buy the 4.3L V6 if you want reliability; avoid 5.3L/6.2L V8s unless AFM is already deleted or you budget $8k-12k for inevitable engine work - the AFM defect is a ticking time bomb that tanks resale value.
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.
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General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2019 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500, and Sierra 3500 Crew Cab vehicles. The left or right-side roof rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
Consequence: A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increasing the risk of injury.
Remedy: Dealers will replace the left and right-side RRAB modules, free of charge. Owner notification letters were mailed April 16, 2026. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262549710. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on March 19, 2026.
AIR BAGS · 25V432000
2025-06-26
General Motors (GM) is recalling certain 2018 GMC Sierra 1500, 2019 Sierra 2500, 3500, Chevrolet Silverado 3500, and Chevrolet Silverado 2500 and 2018 Chevrolet Silverado 1500 Crew Cab vehicles. The left or right-side roof-rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
Consequence: A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increases the risk of injury or crash.
Remedy: Dealers will replace the left and right side RRAB modules, free of charge. Owner notification letters were mailed July 23, 2025. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252513060.
AIR BAGS:SIDE/WINDOW:CURTAIN:INFLATOR · 24V756000
2024-10-10
General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2018-2019 Chevrolet Silverado 2500, 3500, and GMC Sierra 2500, 3500 Crew Cab trucks. The left or right-side roof-rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
Consequence: A separated inflator end cap or inflator rupture can allow compressed gas to escape, resulting in the end cap or other components being propelled into the vehicle, increasing the risk of injury or crash.
Remedy: Dealers will replace the left and right side RRAB modules, free of charge. Owner notification letters were mailed November 8, 2024. Owners may contact Chevrolet customer service at 1-800-222-1020, and GMC Customer Service at 888-988-7267. GM's number for this recall is N242474500.
SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM · 20V603000
2020-10-01
General Motors LLC (GM) is recalling certain 2018 Cadillac Escalade, Chevrolet Silverado 1500 and Tahoe, GMC Sierra 1500 and Yukon vehicles equipped with either a 5.3L or 6.2L V8 engine. The output of the mechanical vacuum pump can decrease over time, decreasing the amount of vacuum/power brake assist.
Consequence: A decrease in brake assist can increase the brake pedal effort and distance required to stop the vehicle, increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will reprogram the Electronic Brake Control Module, free of charge. The recall began November 11, 2020. Owners may contact GM customer service at 1-866-522-9559, Cadillac customer service at 1-800-458-8006 or Chevrolet customer service at 1-800-630-2438. GM's number for this recall is N202300860.
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING · 19V761000
2019-10-24
General Motors LLC (GM) is recalling certain 2015-2020 Chevrolet Suburban, Tahoe, and GMC Yukon, and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a 3.08-ratio rear axle and four-wheel drive. If a wheel-speed sensor fails, while the vehicle is traveling between 41 and 60 mph in four-wheel or automatic mode, the Electronic-Brake Control Module (EBCM) software may activate the driveline-protection system.
Consequence: Unintended activation of the driveline-protection system will cause unintended braking on the wheel on the opposite side of the failed sensor, causing the vehicle to pull to one side unexpectedly, increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will reprogram the EBCM, free of charge. The recall began December 11, 2019. Owners may contact Chevrolet customer service at 1-800-630-2438 or GMC customer service at 1-800-462-8782. GM's number for this recall is N192261050.
SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM · 19V645000
2019-09-06 · PE18012
General Motors LLC (GM) is recalling certain 2015-2017 Cadillac Escalade, 2014-2018 Chevrolet Silverado, GMC Sierra, 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles. The amount of vacuum created by the vacuum pump may decrease over time.
Consequence: As the vacuum level drops, the brake assist decreases, increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash.
Remedy: GM will notify owners, and dealers will reprogram the Electronic Brake Control Module, free of charge. The recall began October 8, 2019. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-458-8006 or GMC customer service at 1-800-462-8782. GM's number for this recall is N192268490.
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