Chevrolet · Known Issues

2015 Chevrolet Silverado Problems: 6 Issues Every Owner Should Know

2015 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated June 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2015 Chevrolet Silverado has 6 documented known issues, with 5 rated critical. The most serious are 8-Speed (8L90 / 8L45) Transmission Shudder, Hard Shift and Torque-Converter Judder ($200-$4,000 repair), 6.6L Duramax LML Bosch CP4.2 Fuel Pump Failure — Whole Fuel System Destruction ($5,000-$12,000 repair), Temporary Loss of Electric Power Steering Assist (Voltage-Drop Recall) ($0-$200 repair), Brake Vacuum Pump Failure — Hard Brake Pedal (3.4M-Vehicle Recall) ($0-$600 repair) and 5.3L V8 Active Fuel Management (AFM) Lifter Collapse and Camshaft Damage ($1,500-$4,500 repair). Across all issues, repair costs range from $200 to $12,000. DIY maintenance guides at au7o.io.

All 6 Known Issues

On the 2015-2019 Chevrolet Silverado, silverados with the Hydra-Matic 8L90 (and 8L45) 8-speed automatic are widely reported to hesitate, then shudder, jerk, clunk or 'hard shift' when changing gears — some owners describe a shift so violent it feels like being rear-ended, plus a torque-converter-clutch shudder that feels like driving over rumble strips. The root cause is internal friction/hydraulic issues and torque-converter-clutch micro-slip, often worsened by the original transmission fluid breaking down, sending metal shavings through the unit. GM issued 13+ TSBs and a fluid change (to Mobil 1 Synthetic LV ATF HP / DEXRON-ULV) as the primary remedy, and the defect is the subject of a certified class action covering 2015-2019 Silverado and other GM models. Very high search and complaint volume.

This issue also affects: Buick Enclave, Buick Encore GX, Buick Regal

Common Symptoms

Shudder / vibration like driving over rumble strips
Harsh or violent hard shifts (clunk/bang)
Hesitation then surge on acceleration
Slipping or flaring between gears
Jerking at low speed / when slowing

How to Fix

First-line fix per GM TSB is a full transmission fluid flush/exchange to the updated low-viscosity fluid (Mobil 1 Synthetic LV ATF HP), which resolves many shudder cases. Persistent shudder or hard shifts may require torque-converter replacement, valve-body service, or transmission overhaul. Adding an auxiliary transmission cooler helps prevent recurrence. Document repairs — affected owners may qualify under the class-action settlement/lemon-law remedies.

What you need to fix it

The exact part — skip the internet hunt.

Transmission fluid — full flush/exchange with updated low-viscosity Dexron HP ATF (first-line TSB fix per GM 18-NA-355).
OEM # 19369363Also fits: Mobil 1 Synthetic LV ATF HP (1 qt), Mobil 1 124715 (case 6 x 1 qt), ACDelco 19417577$13–$15
PRIMARY FIX. GM/ACDelco OE Dexron HP, 1 qt, PN 19369363 (confirmed on parts.chevrolet.com). This is the revised 'Dexron Approved' HP fluid that TSB 18-NA-355 (Dec 2018) specifies to cure 8L90/8L45 torque-converter-clutch shudder after a COMPLETE fluid exchange — NOT Dexron VI. Aftermarket Mobil 1 LV
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Torque converter (8L90) — for persistent shudder/judder not cured by the fluid flush (updated TCC clutch lining)
OEM # 24290214Also fits: ACDelco 24290214 (GM OE), Circle D 258mm HP Series 8L90, Diamond T GS8L90SR$700–$1200
Second-line fix when shudder persists after the flush. GM/ACDelco PN 24290214 confirmed application: 2014–2018 Silverado 6.2L and 2016–2018 Silverado 1500 5.3L with 8L90 — NON start/stop only (start/stop trucks use a different converter). 11in, dual-clutch single-disc. Verify your exact engine + sta
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Auxiliary transmission cooler — preventive add-on to keep ATF temps down and reduce shudder recurrence
Also fits: PPE 8L90 Auxiliary Transmission Cooler Kit, Mishimoto Silverado 1500 V8 trans cooler, B&M / Hayden / Tru-Cool universal stacked-plate cooler$120–$600
Optional/preventive, not a root-cause repair. GM OEM Auxiliary Transmission Cooler Package PN 19244189. Aftermarket all-aluminum kits (PPE, Mishimoto) front-mount and drop fluid temps substantially; many owners also add the upgraded thermal-bypass valve (PPE / GM 84443930). Heat is a primary driver
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Typical repair cost:$200 - $4,000

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On the 2011-2016 Chevrolet Silverado 6.6L V8 Duramax LML Turbo-Diesel, silverado 2500HD/3500HD trucks with the 6.6L Duramax LML use the Bosch CP4.2 high-pressure injection pump, which was designed around European diesel and is poorly lubricated by U.S. ULSD. The pump's roller/cam interface can gall and disintegrate, sending metal shavings throughout the entire fuel system. When it lets go, it contaminates injectors, rails and lines, the engine stalls (often at speed), and the repair commonly runs ~$8,000-$10,000+ because the whole fuel system must be replaced. It is the subject of a certified multi-state class action (Chapman v. GM) that reached a proposed settlement. Very high search and forum demand among HD diesel owners.

This issue also affects: Chevrolet Express, Chevrolet Silverado 2500HD, Chevrolet Equinox

Common Symptoms

Sudden loss of power / engine stall while driving
Hard start or no-start
Metal shavings / debris in fuel filter
Rough running and misfire
Check engine light with fuel-pressure codes
Loud knocking from the injection pump

How to Fix

On a CP4 failure the entire high-pressure fuel system must be flushed/replaced — CP4 pump, injectors, rails, lines and filters — to clear all metal contamination; reusing contaminated parts causes repeat failure. Many owners proactively install a CP4-to-CP3 conversion kit (more tolerant of U.S. diesel) or at minimum a 'disaster prevention'/CP4 bypass kit and an upgraded lift pump and water-separating filter, and run fuel additive for lubricity. Check eligibility under the Chapman v. GM settlement for repair reimbursement.

What you need to fix it

The exact part — skip the internet hunt.

High-pressure injection pump (Bosch CP4.2) — GM OEM replacement
OEM # 12661059Also fits: Bosch 0445010817 (new), Bosch 0986437421 (reman), Bosch 0445010616$608–$900
Canonical GM PN for the 2011-2016 LML/LGH Duramax CP4.2 pump; supersedes 12658095/12645102/12638262/98077841. Bosch new 0445010817 (~$854, 3yr warranty) or reman 0986437421 (~$608, 2yr). NOTE: a like-for-like CP4 replacement does NOT fix the root cause — the CP4.2 self-destructs again. Verified acro
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CP4.2-to-CP3 conversion kit (S&S Diesel Motorsport) — eliminates the failure-prone CP4
OEM # LML-CP3-CARBAlso fits: S&S LML-CP3-CARB (50-state CARB EO #D-756-4, no-tune), S&S LML-CP3-NOTUNINGREQ/D (drop-in, off-road), S&S LML CP3 tuning-required (off-road)$1780–$2600
The preferred long-term fix owners install: swaps the CP4.2 for the bulletproof CP3, far more tolerant of low-lubricity US diesel. S&S part numbers — 50-state CARB-compliant LML-CP3-CARB (~$2,249-$2,600 MAP, no tune); off-road versions ~$1,780 (tune req) to ~$2,175 (drop-in). For the LML there is NO
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Fuel filter / water separator (ACDelco) — lubricity & contaminant protection
OEM # 19431541Also fits: ACDelco TP3018, GM 19420323 (newer blue, higher water removal), GM 12664429$22–$45
OEM ACDelco TP3018 (GM 19431541) for 2001-2016 Duramax; running change to blue 19420323 with 10-20pt better water removal. Frequent filter changes + a water-separating filter are part of CP4 protection. Verified on DmaxStore, ZZ Diesel, IDParts, O'Reilly.
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Typical repair cost:$5,000 - $12,000

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On the 2014-2015 Chevrolet Silverado, gM recalled 2014 Silverado 1500 (NHTSA 17V414, ~690,685 units) and 2015 Silverado/Tahoe/Suburban (over 1 million units) for a temporary loss — and sudden return — of electric power steering assist, especially during low-speed turns. The EPS draws a high-energy load in low-speed maneuvers; when system voltage drops below ~8.8V for more than a second, the module disables assist until voltage recovers, with steering then snapping back to assisted. The sudden change in steering effort can cause loss of control. The remedy is an EPS module software update that reduces the steering system's energy demand. High search demand and a clear safety-recall pedigree.

This issue also affects: Chevrolet HHR, Chevrolet Malibu, Chevrolet Uplander

Common Symptoms

Steering suddenly becomes very heavy, then snaps back to power-assisted
Loss of power steering during low-speed turns / parking
'Power Steering' warning or message on the DIC
Hard steering after start in cold weather

How to Fix

Check VIN against NHTSA recalls 17V414 (2014) and the 2015 EPS campaign and have the dealer flash the updated EPS module software free of charge — this 'greatly reduces' the steering system's energy demand and prevents the dropout. If assist is being lost, also have the battery, alternator and charging-system voltage and grounds checked, since marginal charging voltage triggers the fault.

What you need to fix it

The exact part — skip the internet hunt.

EPS module software reprogram (recall remedy — no consumer part)
$0
THE ACTUAL FIX for both campaigns is a FREE dealer EPS-module software reflash — NHTSA 17V414 (2014 Silverado/Sierra 1500) and 14V719 (2015 Silverado/Sierra 1500 + Tahoe/Suburban/Yukon/Yukon XL). NHTSA Part 573 reports state plainly: 'Dealers will reprogram the EPS module software. No parts are requ
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EPS power steering assist motor kit (dealer hardware remedy if reflash does not resolve / motor faulted)
OEM # 84774199Also fits: 38000587, 84189092$629–$850
Real GM PN 84774199 'MOTOR KIT-P/S ASST' (GM Genuine / ACDelco), the documented hardware-replacement branch of the 14V719 campaign, which evolved from a pure reflash to 'replace the power steering assist motor kit' on affected vehicles. Confirmed across parts.gmparts.com, parts.chevrolet.com, gmpart
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Typical repair cost:$0 - $200

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On the 2014-2018 Chevrolet Silverado, gM recalled about 3.46 million vehicles (NHTSA 19V645 and expanded 20V603), including 2014-2018 Silverado 1500, for an engine-driven brake vacuum pump that loses output over time. Debris and oil sludge build up on the pump's internal filter screen, reducing the vacuum that powers the brake booster. The result is a hard/firm brake pedal requiring much more effort and increased stopping distance, with a 'Service Brake Assist' message. GM attributed 113 accidents and 13 injuries to the condition. Notably, the recall remedy is a software recalibration of the electronic brake control module to add hydraulic boost when vacuum is low — it is NOT a replacement of the failing pump itself, so the underlying P1429 vacuum-pump complaint persists for many owners. High search and complaint volume.

Common Symptoms

Hard / firm brake pedal needing much more effort
Increased stopping distance
'Service Brake Assist' message on the DIC
Pedal effort worse on cold starts / first stops
Ticking or clattering from the vacuum pump area

How to Fix

Check VIN against recalls 19V645 / 20V603 and have the dealer apply the free EBCM software recalibration that activates secondary hydraulic boost when vacuum drops. Because the recall does not replace the pump, owners experiencing a persistently hard pedal or P1429 typically need the mechanical vacuum pump replaced (and the engine oil kept clean, since oil sludge clogs the pump screen). Replace the pump with an updated unit if it is the cause.

What you need to fix it

The exact part — skip the internet hunt.

Engine-mounted mechanical brake vacuum pump (Gen V 4.3L V6 / 5.3L / 6.2L V8)
OEM # 12696313Also fits: Dorman 904-861, Cardone Select 90-1009, ACDelco 12696313 (GM Genuine)$124–$168
THE mechanical fix when the recall recalibration doesn't cure a persistently hard pedal. GM OEM 12696313 is the current/superseding ACDelco vacuum pump for 2014-2020 Silverado/Sierra/Tahoe/Suburban/Yukon/Escalade Gen V engines; it rolls up the older OE numbers 12654013/12659655/12660004/12662552/126
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Typical repair cost:$0 - $600

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On the 2007-2019 Chevrolet Silverado, the 5.3L (and 6.2L) V8 with Active Fuel Management — GM's cylinder-deactivation system that drops the engine to 4 cylinders to save fuel — is notorious for collapsed AFM lifters. The special deactivating lifters (and the lifter oil-manifold/VLOM that feeds them) fail when oil pressure/timing to the lifter is compromised, causing the lifter roller to seize. A collapsed lifter no longer opens its valve, producing a dead-cylinder misfire, a loud ticking/tapping, rough idle and major power loss. If driven on, a collapsed lifter can wipe the camshaft lobe and destroy the cam, turning a lifter job into a top-end rebuild. This is consistently ranked the #1 Silverado engine problem and generates heavy forum and search traffic across the entire 2007-2019 AFM era. Disabling AFM (range tuner/AFM delete) is the common owner mitigation.

This issue also affects: Buick LeSabre, Buick Park Avenue, Buick Cascada

Common Symptoms

Loud ticking or tapping from top of engine
Cylinder misfire / rough idle
Check engine light with misfire code
Sudden loss of power
Engine knock
Excessive oil consumption alongside the tick

How to Fix

On a misfire/tick, pull the valve covers and inspect the AFM lifters and corresponding cam lobes. Standard fix is to replace all 8 AFM lifters (or convert to non-AFM lifters with an AFM-delete kit), the lifter guides, the VLOM/oil manifold, and head gaskets/bolts; if a cam lobe is wiped, the camshaft must be replaced too. Many owners install an AFM-disable tuner or a 'range' device to stop cylinder deactivation and prevent recurrence. Keep oil changes on time and avoid extended intervals — degraded/low oil pressure accelerates AFM lifter failure.

What you need to fix it

The exact part — skip the internet hunt.

AFM/DOD valve lifter set (8 collapsing AFM lifters) — the primary failure part
OEM # 12569256Also fits: ACDelco 12569256 (GM OE, single AFM lifter), GM 12595365 (lifter guide, paired), Delphi HL177 / HL178$22–$55
GM/ACDelco 12569256 is the genuine single AFM/DOD valve lifter (4.8/5.3/6.0/6.2, ~2005-2018 Gen IV). On a collapsed-lifter repair you replace all 8 AFM lifters (price is per lifter; a full 8-AFM + 8-standard + guide-tray kit runs ~$150-350). On Gen IV some apps use the newer DOD lifter 12698946. Aft
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Lifter guides / guide trays (replace whenever lifters are pulled)
OEM # 12595365Also fits: ACDelco 12595365 (GM OE Gen III/IV lifter guide), included in most AFM-DOD lifter kits$8–$20
GM 12595365 is the genuine Gen III/IV lifter guide (per tray); 4 trays per engine. Mandatory replacement when servicing AFM lifters. Note: this is the GUIDE, NOT the AFM lifter itself.
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VLOM — Valve Lifter Oil Manifold (DOD oil solenoid pack; controls/feeds AFM lifters, must be tested/replaced)
OEM # 12571609Also fits: ACDelco / GM Genuine 12571609, superseded by GM 12698755 (VLOM with solenoid), related 12676935 / 12697807$130–$280
GM 12571609 VLOM, ~$269 genuine (GMPartsGiant); GM released updated 12698755 to address AFM problems. Required on an AFM-keep repair; on an AFM-delete it is replaced by a delete valley cover (e.g., Dorman 615-906) instead.
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Cylinder head gasket set (heads must come off; AFM valley/perimeter gaskets included)
Also fits: Fel-Pro HS26191PT-1 (2004-2008 4.8/5.3, VIN B/T/V/Z), Fel-Pro HS 26191 PT, Mizumo full gasket set 4.8/5.3$70–$160
Fel-Pro HS26191PT-1 is the canonical 5.3 head gasket set; OEM GM head-gasket-set PN not cited with confidence so left blank. Fel-Pro is the standard service part for this job. Verify VIN/year for exact head-bolt config (2 designs exist on 2004).
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Replacement camshaft (only if an AFM cam lobe is wiped) / non-AFM delete camshaft
OEM # 12689035Also fits: GM 12689035 (genuine Gen IV non-DOD/AFM single-bolt 5.3 cam), Melling MDK400 (Gen V L82/L83/L8B MDS-delete cam+lifter kit), COMP Cams LS Gen IV 1-bolt VVT w/o AFM$200–$450
If a cam lobe is damaged, replace the cam. For a stock-style non-AFM repair on Gen IV, genuine GM non-DOD cam is 12689035. For Gen V (2014+ L83) use an MDS/DFM-delete cam kit (e.g., Melling MDK400). Caution: 12586481 (seen in searches) is the camshaft SPROCKET (~$35), not the camshaft — do not subst
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Typical repair cost:$1,500 - $4,500

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On the 2014-2020 Chevrolet Silverado, the A/C condenser on K2XX-platform Silverados is a chronic failure point — the condenser develops cracks at the side spot-welds (thermal-stress fatigue) and the discharge line/hose can flex and crack, both of which leak refrigerant and leave the A/C blowing warm air. It was the #1 complaint on the 2014 model year. Because GM's condenser is a 'combi-cooler' with an integrated transmission oil cooler, a failure can affect both cabin cooling and transmission temps. GM acknowledged it with TSB PIT5331 (revised discharge tube + anti-flex bracket, part 23264893) and Special Coverage Adjustment 17336, extending warranty on the specific leak to 5 years / 60,000 miles — but never issued a safety recall. Heavily searched and reported.

Common Symptoms

A/C blows warm or only mildly cool air
A/C cools then quits, especially in heat / at idle
Refrigerant leak (oily residue at condenser)
Hissing on shutdown
Bad/musty odor from vents

How to Fix

Have the system leak-tested (UV dye/electronic sniffer) to confirm the condenser/discharge line is the leak source. Replace the condenser with a revised/updated unit and install the redesigned discharge tube plus the anti-flex bracket per TSB PIT5331, then evacuate and recharge. Check eligibility for GM Special Coverage 17336 — if within 5 yr / 60k mi the repair may be free. Aftermarket condensers (e.g., GM3030306 cross-reference, OE 84537373) are common cost-saving replacements.

What you need to fix it

The exact part — skip the internet hunt.

A/C Condenser (Combi-Cooler) — revised/updated unit
OEM # 84537373Also fits: GM3030306, 23141869, 23141861$70–$230
ACDelco GM OE condenser for 2014-2018/19 Silverado 1500 (and Sierra 1500/Tahoe/Yukon/Suburban/Escalade) with 5.3L/6.2L gas/flex engines, w/ trans oil cooler. This is the primary part for the spot-weld-crack/combi-cooler refrigerant leak addressed by GM Special Coverage 17336 (free repair within 5yr/
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A/C Refrigerant Discharge Hose / Tube (compressor-to-condenser line — redesigned per PIT5331)
OEM # 84194976Also fits: 15-34670$80–$90
ACDelco GM Original Equipment compressor-to-condenser high-side discharge hose for 2014-2015 Silverado 1500 / Sierra 1500. ACDelco catalog # 15-34670 = GM PN 84194976. This is the redesigned tube TSB PIT5331 (Oct-2014) directs techs to install for the cracked compressor-to-condenser line that causes
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A/C Line Anti-Flex Bracket (couples high/low side lines to stop flex-induced cracking — PIT5331)
OEM # 23264893$8–$25
GM/ACDelco anti-flex bracket that PIT5331 instructs techs to install alongside the redesigned discharge line to minimize flexing/movement that cracks the compressor-to-condenser tube. PN 23264893 confirmed via CarComplaints PIT5331 bulletin page and dealer-parts discharge-hose listings (often ordere
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Typical repair cost:$400 - $1,200

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Frequently Asked Questions

What are the most common Chevrolet Silverado problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2015-2015 Chevrolet Silverado has 6 documented issues. The most frequently reported are: 8-Speed (8L90 / 8L45) Transmission Shudder, Hard Shift and Torque-Converter Judder, 6.6L Duramax LML Bosch CP4.2 Fuel Pump Failure — Whole Fuel System Destruction, Temporary Loss of Electric Power Steering Assist (Voltage-Drop Recall). Of these, 5 are rated critical and should be addressed promptly.

Is the Chevrolet Silverado reliable?

The 2015-2015 Chevrolet Silverado has 6 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 5 issues are rated critical: 8-Speed (8L90 / 8L45) Transmission Shudder, Hard Shift and Torque-Converter Judder and 6.6L Duramax LML Bosch CP4.2 Fuel Pump Failure — Whole Fuel System Destruction and Temporary Loss of Electric Power Steering Assist (Voltage-Drop Recall) and Brake Vacuum Pump Failure — Hard Brake Pedal (3.4M-Vehicle Recall) and 5.3L V8 Active Fuel Management (AFM) Lifter Collapse and Camshaft Damage. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Chevrolet Silverado problems?

Repair costs for known Chevrolet Silverado issues range from $0 to $12,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 8-Speed (8L90 / 8L45) Transmission Shudder, Hard Shift and Torque-Converter Judder, typically costs $200-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2015-2019 Chevrolet Silverado 8-Speed (8L90 / 8L45) Transmission Shudder, Hard Shift and Torque-Converter Judder?

Silverados with the Hydra-Matic 8L90 (and 8L45) 8-speed automatic are widely reported to hesitate, then shudder, jerk, clunk or 'hard shift' when changing gears — some owners describe a shift so violent it feels like being rear-ended, plus a torque-converter-clutch shudder that f… Repairs typically run $200-$4,000. Severity: high.

All 6 Known Issues

2015-2019 Chevrolet Silverado: 8-Speed (8L90 / 8L45) Transmission Shudder, Hard Shift and Torque-Converter Judder#

Common Symptoms

How to Fix

What you need to fix it

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2011-2016 Chevrolet Silverado: 6.6L Duramax LML Bosch CP4.2 Fuel Pump Failure — Whole Fuel System Destruction#

Common Symptoms

How to Fix

What you need to fix it

Research This Issue

2014-2015 Chevrolet Silverado: Temporary Loss of Electric Power Steering Assist (Voltage-Drop Recall)#

Common Symptoms

How to Fix

What you need to fix it

Research This Issue

2014-2018 Chevrolet Silverado: Brake Vacuum Pump Failure — Hard Brake Pedal (3.4M-Vehicle Recall)#

Common Symptoms

How to Fix

What you need to fix it

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2007-2019 Chevrolet Silverado: 5.3L V8 Active Fuel Management (AFM) Lifter Collapse and Camshaft Damage#

Common Symptoms

How to Fix

What you need to fix it

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2014-2020 Chevrolet Silverado: A/C Condenser Leak — A/C Blows Warm Air (Spot-Weld Crack / Combi-Cooler Failure)#

Common Symptoms

How to Fix

What you need to fix it

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Other Chevrolet Models

Frequently Asked Questions

What are the most common Chevrolet Silverado problems?

Is the Chevrolet Silverado reliable?

How much does it cost to fix common Chevrolet Silverado problems?

What is the 2015-2019 Chevrolet Silverado 8-Speed (8L90 / 8L45) Transmission Shudder, Hard Shift and Torque-Converter Judder?

What is the 2011-2016 Chevrolet Silverado 6.6L Duramax LML Bosch CP4.2 Fuel Pump Failure — Whole Fuel System Destruction?

What is the 2014-2015 Chevrolet Silverado Temporary Loss of Electric Power Steering Assist (Voltage-Drop Recall)?

What is the 2014-2018 Chevrolet Silverado Brake Vacuum Pump Failure — Hard Brake Pedal (3.4M-Vehicle Recall)?

What is the 2007-2019 Chevrolet Silverado 5.3L V8 Active Fuel Management (AFM) Lifter Collapse and Camshaft Damage?

What is the 2014-2020 Chevrolet Silverado A/C Condenser Leak — A/C Blows Warm Air (Spot-Weld Crack / Combi-Cooler Failure)?