This Preliminary Information communication provides steps the technician will uses to diagnose and repair vehicles that have low oil pressure after an oil change with the engine Regular Production Option Code L20, L77, L94, L96, L99, L9H, LC8, LC9, LH9, LMF, LMG, LY6, or LZ1. Vehicle may have Service Engine Soon lamp with Diagnostic Trouble Code P0521 or Low Oil Pressure message on the instrument panel. Dealer will need to determine if bulletin 10-06-01-008 was completed. If the bulletin was performed inspect the left rocker cover. Dealer will insure the left rocker can hold water without leaking. If leaks are found apply room temperature vulcanization silicone to the rocker cover if possibl
full bulletin at NHTSA ↗2011 Chevrolet Silverado engine problems
moderate 27 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
27
Recalls
0
Avg fix
$3,100
What stands out
Owners have filed 27 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ABOUT VEHICLES THAT MAY HAVE A COLD ENGINE TICK NOISE FOR 50 SECONDS AT START UP. TECHNICIAN DETERMINES IF THE TICK NOISE IS POSSIBLY COMING FROM THE EXHAUST MANIFOLD, AS THIS NOISE COULD EASILY BE MISTAKEN FOR AN ENGINE TICK NOISE. IF YOUR SI DIAGNOSIS DOES NOT ISOLATE THE CAUSE OF THIS CONCERN, THIS CONCERN SHOULD BE CONSIDERED A VEHICLE DESIGN CHARACTERISTIC OF THE ECM CALIBRATION AND NO ADDITIONAL REPAIRS SHOULD BE PERFORMED.
full bulletin at NHTSA ↗THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON VEHICLES THAT MAY HAVE AN INTERMITTENT HIGH IDLE. IF A TECHNICIAN HAS DUPLICATED, OR THE CUSTOMER DESCRIPTION ALIGNS WITH THE SPEEDS MENTIONED IN THE IDLE SPEED DESCRIPTION TABLES, THE IDLE SPEED SHOULD BE CONSIDERED A NORMAL CHARACTERISTIC OF CURRENT VEHICLE DESIGN.
full bulletin at NHTSA ↗This informational bulletin provides information on close coupled converters and there affect on newly installed engines or engines during there break in period.
full bulletin at NHTSA ↗This informational bulletin provides information to technicians regarding intake manifold inspection/replacement after severe internal engine damage.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2011 Silverado engine cluster has multiple distinct failure modes with serious safety and durability implications. Oil-pressure sensor codes (P0521) appear repeatedly, and shops have recommended full engine replacement despite replacing sensors and finding nothing physically wrong. Throttle sensor failures create sudden, dangerous power loss during highway driving—dealers do recognize this and it's covered under warranty, but owners report the issue goes back several model years with a GM service bulletin on file.
Engine misfires and lifter failures are common. Lifters break down as early as 76,000 miles, showing up as tapping noises, check-engine lights, and cylinder-specific misfires. One dealer replaced four lifters; another recommended replacing the cam shaft and all lifters at 76,000 miles. Failures recur even after repairs.
Excessive oil consumption is widespread. Owners report burning 2 quarts per 1,000 miles and needing piston replacement at 36,000–114,000 miles despite keeping up maintenance. One owner paid $5,400 out of pocket after Chevy denied the warranty claim as "wear and tear."
Additional complaints include valve-cover leaks contaminating spark plugs, cold-start and stalling issues, belt-tensioner pulley bearing failures, engine-mount premature wear, electrical system faults with voltage fluctuation, and cruise-control overspeed on grades. Dealers have contradicted each other on root causes and repair necessity.
Same Chevrolet Silverado engine reports on nearby years: 2009 · 2010 · 2012 · 2013 · 2014
Failure modes owners describe
Oil pressure sensor and related sensor faults
Check engine light triggered by oil pressure sensor codes (P0521 reported) and O2 sensor faults. Sensors replaced but codes persist; some dealers have recommended engine replacement despite sensor replacement and oil pressure tests yielding no root cause.
When: 105,000 miles; also reported at 118,000 miles
Symptoms owners cite: Check engine light on; Oil pressure sensor code will not clear; O2 sensor codes; Low oil pressure warning
Codes mentioned: P0521
Repairs/costs cited: Oil pressure sensor replaced with new screen; O2 sensor replaced; oil changes and oil pressure tests performed; dealer recommended full engine replacement
Recalls/TSBs owners mention: No recall noted; extended warranty offered on throttle sensor issue (complaint #11); GM denied service on one occasion despite extended warranty letter
Throttle sensor failure causing power loss and drivability hazard
Throttle sensor malfunction causing sudden, severe engine power reduction during highway driving, creating immediate safety risk. Warning messages include engine power reduced, stability control disabled, and service stabilitrak. Repair generally covered under warranty but issue documented across multiple model years per owner research.
When: Early ownership and 28,200 miles
Symptoms owners cite: Sudden loss of engine power while driving; Engine power reduced warning message; Stability control disabled message; Service stabilitrak message; Traction control error messages; Service engine light on; Vehicle unable to accelerate above 40 mph
Repairs/costs cited: Throttle sensor replaced; repaired under warranty at Chevy dealer
Recalls/TSBs owners mention: GM service bulletin exists for this issue per owner research; covered under warranty; owner noted multiple internet reports of issue across several model years
Engine misfire and cylinder failure
Check engine light with misfire codes. Multiple cylinders fail (cylinders #1, #6, #7 reported). Lifters replaced in some cases but failures recur. Dealers and independent mechanics recommend full engine replacement or rebuild in several cases.
When: 76,000–128,000 miles
Symptoms owners cite: Check engine light illuminated; Engine misfire; Engine sounds high-pitched; Vehicle shakes; Tachometer fluctuates while stopped; Vehicle lunges forward while idling; Remote start fails; Stability track light illuminated
Repairs/costs cited: Four lifters replaced in one case; cam shaft and all lifters recommended for replacement in another; engine rebuild or replacement recommended by multiple dealers
Recalls/TSBs owners mention: GM stated repair not covered under warranty until entire engine fails (complaint #7); no recall; warranty claim denied
Engine lifter and valve train noise and failure
Customers report loud abnormal tapping, knocking, or high-pitched whining from lifter and valve train area. Bearings fail in lifter pulleys, causing wobbling and eventual catastrophic failure risk. Some complaints cite low oil as contributing factor.
When: 99,000–260,000 miles
Symptoms owners cite: Loud abnormal tapping sound from hood; High-pitched whining noise from pulley bearing; Knocking sound from engine; Lifter arm wobbles; Traction control warning light illuminated
Repairs/costs cited: Pistons, rocker arm, head valve seals, and lifter arm replacement recommended; lifters and engine damage diagnosed; repairs attempted but failures recurred
Recalls/TSBs owners mention: No recall; dealer not notified in one case; owner advised engine may need replacement
Excessive oil consumption and burning
Engine burns oil at abnormal rate. Owners report needing to replace pistons at relatively low mileage (36,000–114,000 miles). Oil consumption cited as 2 quarts per 1,000 miles in one complaint. Low-oil-related valve lifter damage has occurred. Oil monitor design alleged to be faulty, not indicating low oil level.
When: 36,000–114,000 miles; one complaint cites issue across 2007–2015 models at 500 miles
Symptoms owners cite: Rapid oil consumption; Burning oil smell; Check engine light; Low oil symptoms; Valve lifter damage from low oil
Repairs/costs cited: Piston replacement ($5,400 out of pocket in one case); PVC filter, valve, and valve cover replaced; ongoing despite maintenance
Recalls/TSBs owners mention: Warranty claim denied as 'wear and tear' despite lifetime powertrain warranty; no recall; no assistance offered; GM told owner part discontinued on hybrid model
Hybrid system battery failure (2011 Silverado Hybrid only)
Hybrid system failed while driving, disabling vehicle. GM shop reported parts discontinued and unavailable. Shop bypassed hybrid system; vehicle now operates only on trickle battery charger and cannot function normally.
When: Unspecified mileage
Symptoms owners cite: Vehicle disabled while driving; Hybrid system inoperative; Vehicle requires constant trickle battery charger to operate
Repairs/costs cited: Hybrid system bypassed; parts unavailable; vehicle not repaired to working condition
Recalls/TSBs owners mention: GM shop stated lack of reliability with used battery; GM told owner cannot help due to discontinued part; no resolution offered; represents safety hazard per owner
Electrical and power distribution faults
Intermittent electrical gremlins including door locks cycling unexpectedly while transmission downshifts, engine dies, instrument cluster goes dark, then restarts. Battery voltage fluctuates between 9–14 volts. Audio system switches inputs randomly, A/C panel flickers, blower fluctuates. Vehicle may not start after episodes.
When: Unspecified mileage
Symptoms owners cite: Door locks activate and deactivate unexpectedly; Transmission downshifts suddenly; Engine dies and restarts; Instrument cluster stops and restarts; Loud 'pop' sound over speakers; Interior lights fail to operate; Cab power loss; Vehicle fails to start; Stereo switches from FM to aux randomly; A/C panel flickers; Blower motor fluctuates; Battery voltage fluctuates 9–14 volts
Repairs/costs cited: Not repaired; cycling ignition provides little help
Engine stalling and cold-start difficulty
Vehicle experiences difficulty starting from cold start and shuts off while driving. Fuel pump replaced in one case but issue recurred. One owner stranded multiple times in high-traffic conditions.
When: Early ownership; 28,200 miles (throttle sensor extended warranty letter)
Symptoms owners cite: Difficulty starting from cold start; Engine shuts off while driving; Vehicle stalls unexpectedly; Check engine light
Repairs/costs cited: Fuel pump replaced; fuel light illuminated after repair; recurred within one week; vehicle towed three times in two weeks
Recalls/TSBs owners mention: Dealer denied service despite manufacturer sending extended warranty letter for throttle sensor malfunction; extended warranty stated failure not covered
Serpentine belt tensioner pulley bearing failure
Belt tensioner pulley bearing fails, causing high-pitched whine and wobble. Owner warns of catastrophic failure risk if pulley breaks, potentially shredding serpentine belt and disabling vehicle or creating highway hazard. Potential for engine damage or fire if belt shreds.
When: Unspecified mileage
Symptoms owners cite: High-pitched whining noise from pulley; Pulley bearing failure; Pulley wobbles excessively
Engine mount failure and repeat breakdown
Engine mounts fail prematurely, requiring replacement multiple times. Owner reports replacing engine mounts twice and preparing for third replacement.
When: Unspecified mileage
Symptoms owners cite: Engine mount degradation; Multiple mount failures
Repairs/costs cited: Engine mounts replaced twice; third replacement in progress
Cruise control overspeed on downhill
Cruise control overspeeds 5–7 mph when descending hills. Occurs consistently on same hill. Owner reports this differs from other vehicles owned.
When: Early ownership (first 12 hours); dealer demo with 2,235 miles
Symptoms owners cite: Cruise control overspeeds on downhill sections; Vehicle exceeds set speed by 5–7 mph; Eventually returns to set speed
Repairs/costs cited: Dealer stated normal behavior; owner disagrees
Recalls/TSBs owners mention: Dealer indicated normal operation
Valve cover leak and spark plug degradation
Valve cover leaks, allowing oil to contaminate spark plugs, causing them to fail and triggering check engine light and hesitation. Issue recurred within 10,000 miles after warranty repair.
When: 29,000 miles (first occurrence); 39,000 miles (recurrence)
Symptoms owners cite: Check engine light; Engine hesitation; Valve cover leak; Spark plug degradation
Repairs/costs cited: Valve cover leak repaired; spark plugs replaced under warranty; issue recurred
Recalls/TSBs owners mention: First repair covered under warranty
Exhaust heater failure (DEF/SCR system)
Exhaust heater failure triggers exhaust fluid warning light. Dealer repaired but failure recurred.
When: 60,000 miles
Symptoms owners cite: Exhaust fluid light illuminated
Repairs/costs cited: Exhaust heater repaired; failure recurred
Recalls/TSBs owners mention: Manufacturer notified; vehicle not in NHTSA campaign 14V407000
Synthesized from 27 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had engine trouble with your 2011 Chevrolet Silverado?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2011 Chevrolet Silverado?
It's a documented issue but not catastrophic. 27 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 21 complaints that reported odometer mileage, most engine failures cluster between 55,500 and 124,639 miles, with the median around 103,000. A quarter of owners report trouble before 55,500; a quarter make it past 124,639. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2011/Chevrolet/Silverado.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.