The 2009 Cobalt shows a clear pattern of fuel system failures across 34 complaints. The primary issue is cracking fuel pump modules that leak gasoline, often accompanied by strong fuel odor and visible fuel pooling under the vehicle. One owner paid nearly $800 at an independent shop for fuel pump and tank replacement before discovering GM had issued a recall for the same problem.
Fuel tank corrosion and rusted fuel lines also appear frequently, causing fuel leaks at 46,000 to 121,000 miles. Several owners report difficulty starting the engine or sudden stalling during highway driving, traced to failing fuel pumps.
A major frustration runs through these complaints: GM issued recall campaigns 12V459000, 12190, and 12045 for fuel system issues, but many owners found their specific VIN excluded despite experiencing identical symptoms—cracked pump housings, leaking tanks, corroded lines, and gasoline odor. Some owners report GM letters saying to monitor for smell in non-high-temperature areas, while others claim dealers refused to acknowledge the problem. Multiple independent mechanics diagnosed cracked fuel pump modules, rusted fuel lines, and failing pumps requiring replacement. One owner spent $610.42 at an independent shop for fuel pump module replacement and requested reimbursement from Chevrolet.
Failure modes owners describe
Fuel pump cracking and leakage
Fuel pump module cracks, causing fuel to leak from the pump assembly. Owners report gasoline odor and visible fuel dripping or pooling, with fuel sometimes visible on ground under the vehicle.
When: Across model years; reports range from 37,000 to 180,000 miles; some failures occur early (under 80,000 miles)
Symptoms owners cite: Gasoline odor inside and outside vehicle; Visible fuel leak or puddle under vehicle; Difficulty starting engine; Engine hard to start or weak fuel pump performance
Repairs/costs cited: Fuel pump module or fuel pump replacement cost reported at $610.42 by one owner; dealers or independent mechanics performed replacements
Recalls/TSBs owners mention: GM recall 12V459000 (Fuel System, Gasoline) issued for certain Cobalts; recall 12190 and 12045 also mentioned. Many vehicles excluded from recall based on VIN or state of registration despite exhibiting same symptoms. Owners report GM refusing coverage citing VIN exclusion.
Fuel tank corrosion and leakage
Fuel tank develops rust and corrosion, leading to cracks and fuel leaks. Corrosion appears on fuel lines and tank itself. One owner had fuel tank replaced along with fuel pump.
When: 60,000 to 121,000 miles; one early case at 46,000 miles
Symptoms owners cite: Gasoline odor; Visible fuel leak near tank area or rear driver's side; Corrosion visible on tank and fuel lines under vehicle
Repairs/costs cited: Fuel tank replacement required (one case approximately $800 at independent garage before recall discovered); fuel line replacement; pressure and return fuel line replacement due to rust
Recalls/TSBs owners mention: GM notified but claimed no recall application. One owner received GM letter advising to monitor for fuel smell if not in high-temperature area and take to dealer if smell detected.
Fuel line cracking and rust deterioration
Fuel lines crack or develop rust, causing fuel to leak. Owners observe cracked fuel lines during inspection or are told by mechanics that fuel lines are rusted and require replacement.
When: 46,000 to 152,816 miles
Symptoms owners cite: Gasoline odor inside and outside vehicle; Visible fuel leak, often near rear wheels or driver's side; Fuel smell present when vehicle parked or driving
Repairs/costs cited: Fuel line replacement; pressure and return fuel line replacement
Recalls/TSBs owners mention: Owners report manufacturer claiming no recall for their VIN or vehicle excluded from campaign 12V459000
Fuel pump failure with starting difficulty and stalling
Fuel pump fails or becomes weak, preventing reliable engine start and causing stalling during driving. Multiple owners describe difficulty starting and unexplained stalls at highway speeds.
When: 143,000 to 180,000 miles (high-mileage failures); one stall at highway speed reported
Symptoms owners cite: Vehicle takes multiple attempts to start; Engine stalls without warning while driving; Gasoline odor; Fuel leak visible
Repairs/costs cited: Fuel pump replacement required; one mechanic also identified pig tail connector needing replacement
Recalls/TSBs owners mention: Manufacturer contacted in some cases and confirmed no recalls on the vehicle
Fuel system odor without visible leak
Strong and persistent gasoline odor emanates from vehicle during driving and while parked, but no visible fuel leak is detected initially. Cause remains undiagnosed in several cases.
When: 74,000 to 175,000 miles
Symptoms owners cite: Strong gasoline odor inside and outside vehicle; Odor present whether vehicle is running or off; Odor recurs even after repair attempts
Repairs/costs cited: Fuel filter and ignition coil replacements attempted in one case but did not resolve odor; fuel lines replaced in one case but failure recurred
Recalls/TSBs owners mention: Campaign 12V459000 identified as possible solution by NHTSA tool search, but vehicle VIN excluded from recall. Dealers unable to duplicate failure in some cases.
Synthesized from 34 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.