The 2023 Buick Encore GX shares GM's subcompact crossover platform with the Chevy Trailblazer, featuring troublesome 1.2L and 1.3L three-cylinder turbo engines that have shown catastrophic failure patterns well before typical warranty expiration. These engines are fundamentally flawed with oil consumption, bearing failures, and cooling system deficiencies that lead to complete rebuilds or replacements.
Catastrophic Engine Failure - 1.3L Turbo
Common · high severity
Typical onset: 30,000-70,000 mi
Symptoms: Excessive oil consumption (1 quart per 1,000 miles or worse), Metallic knocking or ticking from engine bay, Check engine light with misfire codes, Complete loss of power/sudden engine seizure, Metal shavings visible in oil
Fix: Complete engine replacement or rebuild required. Spun bearings, scored cylinders, and piston ring failure are typical root causes. 18-24 labor hours for short block replacement, 25-30 hours for complete rebuild with head work. GM has extended powertrain warranty on some VINs due to widespread failures, verify coverage before paying out of pocket.
Estimated cost: $6,500-12,000
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 20,000-50,000 mi
Symptoms: Transmission fluid puddles under vehicle, Burnt smell from engine bay, Transmission slipping or harsh shifts when fluid low, Pink/red fluid visible around radiator area
Fix: Failed crimped connections on cooler lines routed near exhaust heat. Replace both cooler lines and associated clamps/fittings. 2.5-3.5 hours labor. Must refill transmission and verify proper fluid level and condition afterward. Check for contamination if leak went unnoticed.
Estimated cost: $450-750
Engine Mount Failure - Transmission Mount
Occasional · medium severity
Typical onset: 40,000-80,000 mi
Symptoms: Excessive vibration at idle, Clunking when shifting from Park to Drive, Engine movement visible during acceleration, Steering wheel shakes at stops
Fix: Hydraulic transmission mount separates or tears due to three-cylinder engine vibration characteristics. Mount replacement requires supporting powertrain from below. 2-2.5 hours labor. Inspect all other mounts simultaneously as they typically fail in sequence.
Estimated cost: $350-550
Turbocharger Wastegate/Actuator Issues
Occasional · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Loss of power during acceleration, P0234 or P0299 codes (overboost/underboost), Whistling or hissing from engine bay, Limp mode activation
Fix: Electronic wastegate actuator fails or wastegate linkage binds due to carbon buildup. Often requires complete turbo replacement as actuators are not separately serviceable on these units. 5-7 hours labor including coolant drain, intake removal, and exhaust work.
Estimated cost: $1,800-2,800
PCV System Failure Leading to Oil Consumption
Common · medium severity
Typical onset: 25,000-60,000 mi
Symptoms: Oil consumption without visible leaks, Blue smoke from exhaust on startup, Rough idle, Oil in intake system/throttle body
Fix: Integrated PCV valve in valve cover fails, causing crankcase pressure issues that force oil past rings. Requires valve cover replacement with updated PCV design. 3-4 hours labor including gasket, spark plug tube seals. This is often an early warning sign before complete engine failure - address immediately.
Estimated cost: $650-950
Timing Chain Stretch and Guide Failure
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Rattling noise on cold start that quiets after warmup, Check engine light with cam/crank correlation codes, Rough running or no-start condition, Metallic scraping from front of engine
Fix: Timing chain stretches or plastic guides crack, risking catastrophic valve-to-piston contact. Requires front engine disassembly including chain, guides, tensioner, and both VVT phasers. 12-16 hours labor. Often discovered during engine teardown for other failures. Critical to address at first symptoms to prevent complete engine destruction.
Estimated cost: $2,200-3,800
Owner tips
Check oil level every 500 miles religiously - these engines will self-destruct if run even slightly low
Use only GM-specified Dexos oil and change at 5,000 mile intervals maximum, not the 7,500 mile maintenance reminder
Verify if your VIN is covered under GM's extended powertrain warranty for engine failures (bulletin 20-NA-355)
If buying used, absolutely get a pre-purchase compression test and oil consumption check - walk away from anything using more than 1 quart per 2,000 miles
Watch for early warning signs: any oil consumption before 50k miles or abnormal engine noise means imminent failure
Avoid unless still under comprehensive warranty - these three-cylinder turbo engines have proven to be some of GM's least reliable powerplants in recent history with failure rates approaching 15-20% before 80k miles.
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: AGM battery required for start-stop system; H6 group may be alternate fitment
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Every control module on the 2020-2026 Buick Encore GX — 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.
📍 Integrated into transmission assembly, driver side of transaxle
🔧 GM SPS2 via ACDelco TDS + J2534
⚠️ Requires transmission fluid drain and partial disassembly. VIN programming and adaptive relearn required. CVT models (1.3L) vs 9-speed (1.2L) use different TCMs.
Electric Power Steering Control Module (EPSCM)2.0 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Integrated into steering column assembly, below instrument panel
🔧 GM SPS2 or Autel MaxiSys
⚠️ Requires steering angle sensor calibration and steering position relearn after replacement. Column disassembly required.
📍 Behind instrument panel, center console area near BCM
🔧 GM SPS2 via ACDelco TDS + J2534
⚠️ Security gateway module. Controls CAN bus communication and security authentication. Requires online GM authentication for programming. Critical module - failure affects multiple systems.
📍 Engine compartment, driver side firewall area, mounted to bulkhead
🔧 GM SPS2 via ACDelco TDS + J2534
⚠️ Requires VIN programming, theft deterrent relearn, and online authentication through security gateway. 1.3L turbo and 1.2L turbo use different ECM part numbers.
HVAC Control Module (HVAC)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Behind center instrument panel, integrated with climate control head unit
🔧 GM SPS2 or basic scan tool
⚠️ Automatic climate control models only. Manual systems use non-programmable control head. Actuator calibration required after replacement.
Parking Assist Control Module (PACM)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Behind rear bumper cover, center area near hitch receiver
🔧 GM SPS2 or Autel MaxiSys
⚠️ Rear park assist models only. Requires sensor calibration after replacement. Front and rear park assist use same module on higher trims.
Suspension Control Module (SCM)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Under vehicle, mounted to rear suspension crossmember
🔧 GM SPS2 or Autel MaxiSys
⚠️ Adaptive suspension models only (rare on Encore GX). Requires ride height calibration after replacement.
📍 Behind center stack touchscreen display, integrated with radio head unit
🔧 GM SPS2 via ACDelco TDS + J2534
⚠️ 7-inch or 8-inch touchscreen depending on trim. Requires VIN programming and feature configuration. OnStar and connected services reactivation required.
Remote Control Door Lock Receiver (RCDLR)1.0 hr R&Rsecurity gateway +0.8 hr▸ programming details
📍 Behind instrument panel, center stack area near radio
🔧 GM SPS2 via ACDelco TDS + J2534
⚠️ Controls remote keyless entry and passive entry (if equipped). Requires VIN programming and key fob relearn. Security gateway locked.
📍 Behind instrument panel, center of driver display area
🔧 GM SPS2 via ACDelco TDS + J2534
⚠️ Requires VIN programming and mileage transfer from old module. Digital cluster (2022+) vs analog cluster (2020-2021) use different programming procedures.
Door Control Module (DCM)0.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Inside driver door panel, behind door trim
🔧 GM SPS2 or Autel MaxiSys
⚠️ Driver door only on most trims. Controls power windows, mirrors, and door locks. Window auto-up/down relearn required after replacement.
Headlamp Control Module (HCM)0.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Behind left headlamp assembly, driver side front fender area
🔧 GM SPS2 or Autel MaxiSys
⚠️ LED headlamp models only. Halogen models use BCM control. Headlamp aiming calibration recommended after replacement.
Seat Control Module (SCM)0.5 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under driver seat, mounted to seat frame
🔧 Basic scan tool
⚠️ Power seat models only. Controls seat position memory and heating (if equipped). Simple relearn procedure, no VIN programming typically required.
Rear Vision Camera Module (RVCM)0.5 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Integrated into liftgate handle assembly, center of liftgate
🔧 GM SPS2 or Autel MaxiSys
⚠️ Standard on all trims. Camera calibration and dynamic guidelines calibration required after replacement. Surround vision (2022+) uses additional cameras.
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.
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 Buick Encore GX 1.2L Turbo I3 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.