The 2023 Blazer EV is GM's Ultium-based electric crossover sharing architecture with the Cadillac Lyriq. Being first-year production, early units show teething issues with drive unit mounts, thermal management software, and high-voltage component integration that weren't fully sorted at launch.
Drive Unit / Transmission Mount Failures
Common · medium severity
Typical onset: 15,000-35,000 mi
Symptoms: Clunking or thudding during acceleration or deceleration, Vibration felt through floor or steering wheel especially on hard launches, Visible sag or misalignment of drive unit when inspected on lift
Fix: Replace failed motor mount(s), typically the rear drive unit mount. Requires lifting drivetrain slightly to access. 2.5-3.5 hours labor. GM issued revised mounts with better damping material mid-2023.
Estimated cost: $450-750
Drive Unit Fluid Leaks and Contamination
Occasional · high severity
Typical onset: 20,000-50,000 mi
Symptoms: Gear oil pooling under vehicle near drive unit, Whining or grinding noises during acceleration, Reduced performance or power delivery hesitation, Diagnostic codes for drive unit temperature or lubrication faults
Fix: Seal replacement if caught early (output shaft seal most common, 3-4 hours). If contamination occurred, drive unit rebuild or replacement needed (8-12 hours). Some units had manufacturing defects in seal installation.
Estimated cost: $800-1,200 for seals; $4,500-7,500 for rebuild/replacement
Inverter Coolant System Failures
Occasional · high severity
Symptoms: Propulsion power reduced warning with turtle mode engagement, Coolant loss with no visible external leaks, Error codes for inverter overheating or coolant flow issues, Steam or coolant smell from under vehicle after driving
Fix: Internal coolant leak in inverter housing or failed coolant pump in high-voltage loop. Inverter R&R requires high-voltage lockout procedures and coolant system evacuation/refill. 6-8 hours labor. Some warranty extensions issued for early production.
Estimated cost: $3,500-5,500
Battery Thermal Management Software Glitches
Common · medium severity
Symptoms: Sudden range loss (30-40%) especially in cold weather, Battery preconditioning not functioning properly, Charging speed limited to 50-60 kW at DC fast chargers when should be 190 kW, Persistent 'Service High Voltage Charging System' messages
Fix: Usually fixed with software update (TSB 23-EV-003) reflashing battery management system and thermal controller. 1-2 hours including diagnostics. Some cases required coolant pump or valve replacement in battery pack thermal loop (5-7 hours).
Estimated cost: $200-400 for flash; $2,000-3,200 if hardware replacement needed
12V Battery Drain and Electrical Gremlins
Common · low severity
Symptoms: Vehicle won't wake up or go into ready mode after sitting 3-5 days, Infotainment system random reboots or black screen, Key fob not detected errors when fob is working, Multiple phantom fault codes stored with no actual issues
Fix: First-gen Ultium vehicles have DC-DC converter calibration issues causing 12V battery drain. Software update usually resolves (TSB 23-NA-044). If 12V battery already damaged, replace it (0.5 hours). Some units needed body control module replacement (2-3 hours).
Estimated cost: $150-300 for battery; $800-1,400 if BCM replacement needed
AC Evaporator Corrosion and Refrigerant Loss
Occasional · medium severity
Typical onset: 25,000-60,000 mi
Symptoms: Reduced cooling performance over time, AC compressor cycles on/off rapidly, Refrigerant low warnings or HVAC system faults, Musty smell from vents even after cabin filter replacement
Fix: Evaporator core develops pinhole leaks, requires dash removal for access. 8-10 hours labor plus evacuation/recharge. Known issue on GM Ultium vehicles built in first 18 months. Flush entire AC system during repair to prevent compressor damage.
Estimated cost: $1,800-2,800
Owner tips
Keep high-voltage battery between 20-80% charge for daily use to maximize longevity; avoid repeated 100% charges unless needed for trips
Perform drive unit fluid inspection at 30,000 mi even though GM says 'lifetime fill' — early contamination can destroy the unit
Install all software updates promptly; GM released multiple critical patches for thermal management and charging in first two years
If you see propulsion-reduced warnings, do NOT continue driving — thermal runaway in drive units can cause catastrophic failure
Wait for 2024-2025 models where GM sorted most first-year bugs, or buy a 2023 only with comprehensive warranty coverage — too many expensive high-voltage teething issues for a used purchase.
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: Auxiliary 12V battery; main traction battery is 288-cell lithium-ion EV battery pack
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Every control module on the 2023-2026 Chevrolet Blazer EV — 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.
Rear Electric Drive Unit Control Module (REDUPM)3.8 hr R&Rsecurity gateway +1.0 hrAWD models (RS, SS)▸ programming details
📍 Integrated with rear drive unit assembly under vehicle
🔧 GM SPS2 + Techline Connect
⚠️ Secondary traction motor controller for rear axle. Requires coordination programming with front EDUPM.
Heating Ventilation Air Conditioning Control Module (HVAC)2.8 hr R&Rdealer / factory tool +0.4 hr▸ programming details
📍 Behind center instrument panel, integrated with HVAC unit
🔧 GM SPS2
⚠️ Controls electric heat pump system (no engine coolant heat). Requires refrigerant recovery and recharge.
📍 Engine compartment, mounted to brake modulator assembly on left strut tower
🔧 GM SPS2 + Techline Connect
⚠️ Integrated with hydraulic control unit. Controls ABS, traction control, stability control, and regenerative braking coordination. Brake bleed and system test required after replacement.
Power Liftgate Module (PLG)1.2 hr R&Rdealer / factory tool +0.4 hrwith power liftgate▸ programming details
📍 Behind right side of instrument panel, near glove box
🔧 GM SPS2
⚠️ Provides OnStar, connected services, Wi-Fi hotspot, and OTA update capability. Subscription activation required.
Headlamp Control Module (HCM)0.6 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Behind left headlamp assembly in engine compartment
🔧 GM SPS2 or Autel
⚠️ Controls LED headlamps, DRL, and automatic high beam. Auto-leveling calibration if equipped.
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 2023 Cadillac XT6, GMC Acadia, Chevrolet Blazer, Traverse, and 2022-2023 Cadillac XT5 vehicles. The transmission may have been built with an incorrect sun gear, which can result in the driver-side half-shaft disengaging from the transmission.
Consequence: A half-shaft disengaging from the transmission can result in a loss of drive power or vehicle rollaway when the vehicle is placed in park. Either of these scenarios can increase the risk of a crash.
Remedy: Dealers will replace the sun gears, free of charge. Owner notification letters were mailed on July 27, 2023. The remedy is expected to become available August 31, 2023. 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. GMC's number for this recall is N222389310.
POWER TRAIN:DRIVELINE:DRIVESHAFT · 23V042000
2023-02-02
General Motors, LLC (GM) is recalling certain 2023 Chevrolet Blazer and Traverse vehicles. The left-side half-shaft assemblies may be missing a retaining ring.
Consequence: A missing retaining ring on the half-shaft can cause half-shaft inner joint separation, resulting in a loss of drive power or vehicle rollaway when the vehicle is placed in park. Either of these scenarios can increase the risk of a crash.
Remedy: Dealers will replace the left-side half-shaft assembly, free of charge. Owner notification letters were mailed February 23, 2023. Owners may contact Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N222390180.
Wiper blades
Electric version shares platform with gas Blazer. 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 2023 Chevrolet Blazer EV Electric Single Motor 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.