2016 CHEVROLET VOLT

Typical onset: 50,000-90,000 mi

Symptoms: Excessive oil consumption (1 quart per 1,000 miles or worse), Blue smoke on startup after sitting, Low oil pressure warning, Check engine light with P0301-P0304 misfire codes, Engine runs rough when range extender kicks in

Fix: This requires a complete engine teardown to replace piston rings, often combined with cylinder honing or bore work. Many shops recommend short block replacement instead of risking a ring job on worn bores. Expect 18-24 labor hours for a proper rebuild, 12-16 for short block swap. GM issued a warranty extension to 120k miles for some VINs, check eligibility first.

Estimated cost: $4,500-7,500

Typical onset: 60,000-100,000 mi

Symptoms: Red fluid drips under front of vehicle, Transmission overheat warning on dashboard, Burnt transmission fluid smell, Reduced performance in mountain mode or under load

Fix: The metal cooler lines corrode where they pass near the subframe, particularly the lower line. Replacement requires removing the plastic undershield and dropping the subframe slightly for access. Use OEM lines—aftermarket ones crack at the fittings. 2.5-3.5 labor hours, fluid flush included.

Estimated cost: $600-900

Symptoms: Propulsion power reduced message on DIC, Vehicle won't shift out of park, Traction battery won't charge from wall or engine, Check engine light with U0151 or U0293 codes, Sudden loss of all electric drive with gas engine running

Fix: The BECM controls high-voltage battery management and fails due to internal capacitor or circuit board issues. This is NOT a software reflash—module replacement is required. Located under rear seat area, requires disconnecting HV battery (orange service disconnect). 3-4 labor hours plus programming time. Must be dealer-programmed in most cases.

Estimated cost: $2,200-3,500

Typical onset: 70,000-110,000 mi

Symptoms: Severe clunk when switching between drive and reverse, Vibration through steering wheel when range extender starts, Visible sagging of engine/transaxle assembly, Metal-on-metal knock during hard acceleration

Fix: The upper torque strut mount (hydraulic style) fatigues and tears. The Volt's instant torque from electric motors accelerates wear. Replacement requires supporting the powertrain from below while swapping the mount. Use OEM or Westar brand—cheap mounts fail in 6 months. 1.5-2 labor hours.

Estimated cost: $350-550

Symptoms: Hard start or no-start when range extender tries to run, Check engine light with P0087 (fuel pressure low), Strong varnish smell from exhaust when engine runs, Fuel maintenance mode runs frequently, Rough idle and stalling when gas engine operates

Fix: Owners who drive electric-only for months develop varnished fuel injectors and clogged fuel filters. The in-tank pump can also fail from sitting in old gas. Full fix includes fuel system cleaning, injector replacement, and new fuel filter (integrated with pump module). Tank may need drop for pump access. 4-6 labor hours depending on fuel age and contamination level.

Estimated cost: $800-1,400

Symptoms: Dead 12V battery after sitting 3-5 days, Clicking when pressing start button but no ready light, Radio and climate settings reset frequently, OnStar/4G LTE module stays active continuously

Fix: The OnStar/communications module and BECM can draw excessive current when vehicle sits. If 12V battery is original (Group 47, under hood), replace it first—they're weak from factory. If drain persists, pull fuse 23 (OnStar) for testing. Module replacement needed if confirmed faulty. Diagnosis 1-2 hours, module swap 1 hour.

Estimated cost: $180-250 for battery, $600-1,200 if module replacement needed