OnStar system failures
OnStar module or communication issues
Check engine light: Off
OnStar module and related wiring/connector failures were reported at least 4 separate times, notably early in the vehicle's life — three of the four reports at just 5,000-6,000 miles. Most cases documented were warranty-covered, so we don't have an owner-paid cost figure. This is a telematics/infotainment fault, not an engine issue, so it doesn't trigger a check-engine light.
5,000–6,000 mi
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Power door lock / power window malfunctions
doors locking on their own with no input, or a window switch that only works intermittently
Check engine light: Off
A cluster of very early-life electrical faults: power door locks "firing on own" (activating without input) reported three separate times between 1,240 and 3,720 miles, and a power window switch working only intermittently at just 620 miles. No cost figures were given in the available data, but the pattern itself — multiple independent reports, all at very low mileage — is a notable early-life quality signal. This is an electrical/mechanical fault, not an engine issue, so it doesn't trigger a check-engine light.
620–3,720 mi
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AC system issues
intermittent AC controls, or AC that isn't blowing cold air
Check engine light: Off
AC control module, regulator circuit, and compressor plug issues were documented at $401 at 123,000 miles — a genuine higher-mileage wear item, unlike most of this generation's early-life electrical faults. The likely range is $321 – $441. This is a comfort-system fault, so it doesn't trigger a check-engine light.
$321 – $441123,000 mi
Based on a single documented figure ($401), widened into a range; a genuine higher-mileage wear item, unlike most other electrical faults reported.
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Turn signal switch failure
the turn signal not automatically canceling after completing a turn
Check engine light: Off
Turn signal switch failure — the signal not automatically canceling after a turn — was reported twice: one warranty case at 24,000 miles, and a $200 owner-paid replacement at 128,000 miles, which we've widened into a $160-$220 range. This is an electrical/mechanical fault, not an engine issue, so it doesn't trigger a check-engine light.
$160 – $22024,000–128,000 mi
the $200 figure (128,000 mi) is widened into the range shown; an earlier case (24,000 mi) was warranty-covered.
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Battery failure
a battery that won't hold a charge
Check engine light: Off
Battery failure was documented at $180 (Group 90 replacement) at 121,000 miles. A separate, earlier "bad" battery case was reported at 30,000 miles with no cost given. A standard 12V battery fault, not an engine issue, so it doesn't trigger a check-engine light.
$150 – $19830,000–121,000 mi
the $180 figure (121,000 mi) is widened into the range shown; an earlier case (30,000 mi) had no cost given.
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Fuel system issues
the vehicle being stranded, or a check engine light from a fuel system fault
Check engine light: On
Two fuel-system failures at very similar mileage: a fuel pump failure that stranded the vehicle for $400 at 63,800 miles, and a broader fuel system check-engine-light case for $1,200 at 64,400 miles. The two figures are shown as a range rather than averaged, since they may cover different scopes of repair.
$400 – $1,20063,800–64,400 mi
two real documented figures at very similar mileage, possibly different repair scopes — presented as a range rather than averaged. Check-engine-light status is directly sourced for the $1,200 case.
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Mass airflow sensor (MAF) failure — early-life
the vehicle not running properly
Check engine light: On
A mass airflow (MAF) sensor failure causing the vehicle to run improperly was reported at just 12,400 miles — notably early. MAF sensor faults reliably set a check-engine light.
12,400 mi
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Electric power steering system problems, may need steering column replacement
Electric power steering system problems that may require a steering column replacement
Check engine light: Off
Electric power steering system problems that may require a steering column replacement. This is among the more frequently reported issues on this generation, with 857 owner reports on file.
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No-start due to failed Passlock sensor
Vehicle won't start due to a failed Passlock anti-theft sensor
Check engine light: Off
Vehicle won't start due to a failed Passlock anti-theft sensor. This is among the more frequently reported issues on this generation, with 626 owner reports on file.
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Fuel gauge misreads, check engine light codes P0455/P0461
Fuel gauge reads incorrectly, with EVAP-related check engine light codes
Check engine light: On
Fuel gauge reads incorrectly, with EVAP-related check engine light codes. This is among the more frequently reported issues on this generation, with 503 owner reports on file.
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No-start due to ignition switch failure
Vehicle won't start due to an ignition switch failure
Check engine light: Off
Vehicle won't start due to an ignition switch failure. This is among the more frequently reported issues on this generation, with 432 owner reports on file.
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Ignition key stuck due to failed shifter
Ignition key gets stuck due to a failed shifter mechanism
Check engine light: Off
Ignition key gets stuck due to a failed shifter mechanism. This is among the more frequently reported issues on this generation, with 265 owner reports on file.
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Intake manifold gaskets leak coolant or oil
Intake manifold gaskets leak coolant or oil
Check engine light: Off
Intake manifold gaskets leak coolant or oil. This is among the more frequently reported issues on this generation, with 208 owner reports on file.
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Instrument panel lighting failure, faulty dimmer module
Instrument panel lighting fails due to a faulty dimmer module
Check engine light: Off
Instrument panel lighting fails due to a faulty dimmer module. This is among the more frequently reported issues on this generation, with 186 owner reports on file.
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Transmission fault, check engine light with multiple codes
Transmission fault triggers a check engine light with multiple codes
Check engine light: On
Transmission fault triggers a check engine light with multiple codes. This is among the more frequently reported issues on this generation, with 173 owner reports on file.
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Ignition module or coil failure, engine misfire
Engine misfire from an ignition module or coil failure
Check engine light: On
Engine misfire from an ignition module or coil failure. This is among the more frequently reported issues on this generation, with 161 owner reports on file.
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Poor terminal contact at BCM connectors, electrical issues
Electrical issues traced to poor terminal contact at the body control module (BCM) connectors
Check engine light: Off
Electrical issues traced to poor terminal contact at the body control module (BCM) connectors. This is among the more frequently reported issues on this generation, with 130 owner reports on file.
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A large share of this generation's electrical-fault volume — airbag warning lights, sensor faults, and connector issues, at least 12-15 separate reports — ties directly to a confirmed recall (Campaign 13040A) and is excluded from the list above; see the recall notice below. Among the remaining problems, the most notable pattern is a cluster of early-life electrical faults — power door locks "firing on own" and a power window switch failing intermittently, both reported under 4,000 miles.