The 2019 Volt is generally solid as plug-in hybrids go, but the 1.5L range-extender engine has catastrophic oil-consumption issues that can destroy pistons and bearings if not caught early. The Voltec drivetrain itself is robust, but when the gas engine grenades, you're looking at rebuild-level money.
1.5L Range Extender Catastrophic Oil Consumption / Piston Ring Failure
Occasional · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Low oil warning light with excessive consumption (1 qt per 500-1000 mi), Blue smoke on startup or under load when engine runs, Check engine light with misfire codes (P0300-P0304), Knocking/rattling noise from engine during range-extender operation, Engine stall or no-start after low oil condition
Fix: If caught early with just ring issues, you're looking at piston ring replacement (10-14 hrs labor). If owner ran it low on oil, expect scored cylinder walls, spun bearings, or damaged crank requiring full shortblock replacement (18-24 hrs). GM issued TSB for software update to alert drivers sooner, but physical damage still requires teardown. Some engines get full rebuilds; others get reman shortblocks.
Estimated cost: $4,500-8,500
Transmission Oil Cooler Line Leaks / Failure
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Transmission fluid puddles under vehicle (typically red/pink fluid), Low transmission fluid warning on dash, Slight delay or jerkiness in Drive mode transitions, Visible corrosion or wetness around cooler line fittings at radiator
Fix: Cooler lines corrode where they connect to the transaxle or radiator, especially in salt states. Replacement involves draining fluid, removing lines, and often replacing quick-connect fittings that strip during removal (2.5-3.5 hrs labor). Must refill with Dexron-VI and verify no air in system.
Estimated cost: $450-750
Driver-Side Transmission Mount Failure
Common · low severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunk or thud when shifting from Park to Drive/Reverse, Vibration felt through steering wheel or floor during acceleration, Visible cracking or separation of rubber in mount upon inspection, Excessive drivetrain movement visible when rocking engine by hand
Fix: The hydraulic driver-side mount wears out from the instant-torque nature of the electric drive. Requires lifting engine slightly, unbolting old mount, installing new OEM or aftermarket (1.5-2 hrs labor). Recommend inspecting all three mounts simultaneously; if one is shot, others aren't far behind.
Estimated cost: $280-450
12V Battery Premature Failure
Occasional · medium severity
Symptoms: Vehicle won't enter Ready mode even with high-voltage battery charged, Accessory power loss, blank infotainment screen, Clicking noise from under hood when attempting to start, 12V battery voltage below 12.2V at rest or fails load test, Warning message 'Service Battery Charging System'
Fix: The small 12V AGM battery (tucked behind access panel in cargo area) powers computers and contactors. Volt's sleep/wake cycles stress it more than conventional cars; many fail at 3-5 years regardless of mileage. Replacement is straightforward (0.5 hrs labor) but requires proper AGM battery and computer relearn procedure via Tech2/MDI scan tool to prevent charging-system faults.
Estimated cost: $250-400
Fuel System (EVAP) Pressure Sensor / Fuel Pump Module Faults
Occasional · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Check engine light with codes P0452, P0453 (fuel tank pressure sensor), Fuel system not maintaining pressure, hard start on range-extender mode, Fuel gauge reading erratically or stuck, Smell of fuel vapor near tank area
Fix: Because the engine runs infrequently, fuel system components see long periods of inactivity. Pressure sensors fail, pump seals dry out, or the fuel filter integrated into the pump module clogs from stale gas. Dropping the fuel tank (2-3 hrs labor) is necessary to replace pump module or pressure sensor. If owner doesn't run engine monthly, fuel can varnish and cause additional issues.
Estimated cost: $600-950
Rear Brake Caliper Seizure (Recall-Related)
Occasional · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: Rear brake drag, vehicle pulls to one side, Burning smell or excessive heat from rear wheels after driving, Premature wear on rear pads/rotors on one side, Parking brake warning light or reduced regen braking feel
Fix: GM issued recall 19V642 for rear caliper pistons that can corrode and seize due to moisture intrusion in the phenolic piston material. Recall covers inspection and replacement if needed (1.5-2 hrs per side). If recall wasn't done or corrosion progresses post-repair, aftermarket caliper replacement required. Because regen does most braking, owners often don't notice until pad is metal-on-metal.
Estimated cost: $350-600
Owner tips
Run the range-extender engine at least monthly even if you don't need it—use 'Mountain Mode' for 20 minutes to circulate oil and prevent fuel varnish. Check oil every 2,000 mi; if consumption exceeds 1 qt per 3,000 mi, address immediately before piston damage occurs.
Replace 12V AGM battery proactively at 4-5 years; aftermarket batteries without proper group-size specs cause charging-system faults.
Inspect transmission mounts annually; the Volt's instant torque accelerates wear compared to conventional cars.
If you live in salt states, rinse undercarriage monthly and apply fluid film to cooler lines and subframe bolts to prevent corrosion-related failures.
Buy one if the range-extender engine has documented oil-consumption checks and hasn't been starved; avoid high-mileage examples without service records showing proactive engine maintenance—catastrophic engine failure turns a $12k car into a $4k repair bill.
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: Located in rear cargo area; AGM required for start-stop system and plug-in hybrid operation
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Every control module on the 2016-2019 Chevrolet Volt — 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.
Electric Power Steering Control Module (EPSCM)2.5 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Integrated with steering column assembly, below instrument panel
🔧 GM SPS2 via GDS2/MDI or Techline Connect
⚠️ Steering angle sensor calibration required after replacement
Body Control Module (BCM)2.0 hr R&Rdealer / factory tool +0.8 hr▸ programming details
Remote Control Door Lock Receiver (RCDLR)0.8 hr R&Rdealer / factory tool +0.3 hr▸ programming details
📍 Behind rear interior trim, driver side
🔧 GM SPS2 via GDS2/MDI or Techline Connect
⚠️ Key fob programming required
Park Assist Control Module (PACM)0.8 hr R&Rrelearn only +0.2 hrwith rear park assist▸ programming details
📍 Behind rear bumper cover, center
🔧 Basic scan tool for sensor calibration
Driver Seat Control Module (DSCM)0.8 hr R&Rno codingwith power driver seat
📍 Under driver seat, mounted to seat frame
Rear Vision Camera Module (RVCM)0.5 hr R&Rno coding
📍 Integrated with rear liftgate handle assembly
⚠️ Standard equipment on Gen 2
Headlamp Control Module (HCM)0.5 hr R&Rno coding▸ programming details
📍 Engine compartment, behind driver side headlamp assembly
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.
General Motors LLC (GM) is recalling certain 2018-2019 Cadillac CT6, Escalade ESV, Chevrolet Suburban, Volt, and GMC Yukon XL vehicles. Certain second-row or third-row rear seatbelts retractor assemblies may not automatically lock when the seatbelt is fully pulled out of the retractor, possibly preventing a child seat from being properly secured. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
Consequence: If the child seat is not properly secured in the event of a crash, it can increase the risk of injury.
Remedy: GM will notify owners, and dealers will inspect the rear seatbelt retractors and replace them if necessary, free of charge. The recall began November 7, 2018. Owners may contact Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020 or GMC customer service at 1-800-462-8782. GM's number for this recall is 18315.
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER · 18V576000
2018-08-30
General Motors LLC (GM) is recalling certain 2018-2019 Chevrolet Equinox, Impala, Cruze, Volt and Bolt EV vehicles, GMC Terrain vehicles, Buick Lacrosse and Regal vehicles, Cadillac XTS and XTS Professional vehicles and 2018 Chevrolet Malibu vehicles. The rear brake caliper pistons may have an insufficient coating causing gas pockets to form, potentially reducing rear brake performance.
Consequence: A reduction of braking performance can increase the risk of a crash.
Remedy: GM will notify owners, and dealers will bleed the vehicle's brake system, free of charge. The recall began October 11, 2018. Owners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782. GM's number for this recall is 18279.
Fuel economy (EPA)
City
43mpg
Highway
42mpg
Combined
42mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Compact Cars
Wiper blades
Gen 2 Volt (2016-2019); sedan body style has no rear wiper
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 2019 Chevrolet Volt 1.5L I4 Range Extender 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.