2018 GMC Sierra 1500
Problems, recalls and owner-reported issues
Power train is the leading concern among 304 owner complaints filed for this model year. This is the 11th highest complaint count among 26 Sierra 1500 model years with reports.
Of the 2018 reports, 10 involved a crash and 1 involved a fire. 5 people were injured.
What owners report most often
Recalls and investigations
Air bagsMay 21, 2026
General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2019 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500, and Sierra 3500 vehicles. The left-side or right-side roof rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increasing the risk of injury.
Dealers will replace both RRAB modules, free of charge. Owner notification letters were mailed June 24, 2026. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262557310. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on May 21, 2026. This recall expands previous NHTSA recall number 26V166.
Campaign 26V325000 on NHTSA.gov
Air bagsMar 19, 2026
General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2019 Chevrolet Silverado 2500, Silverado 3500, GMC Sierra 2500, and Sierra 3500 Crew Cab vehicles. The left or right-side roof rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increasing the risk of injury.
Dealers will replace the left and right-side RRAB modules, free of charge. Owner notification letters were mailed April 16, 2026. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N262549710. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on March 19, 2026.
Campaign 26V166000 on NHTSA.gov
Air bagsJun 26, 2025
General Motors (GM) is recalling certain 2018 GMC Sierra 1500, 2019 Sierra 2500, 3500, Chevrolet Silverado 3500, and Chevrolet Silverado 2500 and 2018 Chevrolet Silverado 1500 Crew Cab vehicles. The left or right-side roof-rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
A detached end cap or inflator rupture can allow compressed gas to escape and project the end cap or fragments of the inflator into the vehicle, increases the risk of injury or crash.
Dealers will replace the left and right side RRAB modules, free of charge. Owner notification letters were mailed July 23, 2025. Owners may contact GMC customer service at 1-888-988-7267 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N252513060.
Campaign 25V432000 on NHTSA.gov
Air bags, side/window, curtain, inflatorOct 10, 2024
General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, GMC Sierra 1500, 2018-2019 Chevrolet Silverado 2500, 3500, and GMC Sierra 2500, 3500 Crew Cab trucks. The left or right-side roof-rail air bag (RRAB) inflator end cap may detach from the inflator or the inflator sidewall may rupture.
A separated inflator end cap or inflator rupture can allow compressed gas to escape, resulting in the end cap or other components being propelled into the vehicle, increasing the risk of injury or crash.
Dealers will replace the left and right side RRAB modules, free of charge. Owner notification letters were mailed November 8, 2024. Owners may contact Chevrolet customer service at 1-800-222-1020, and GMC Customer Service at 888-988-7267. GM's number for this recall is N242474500.
Campaign 24V756000 on NHTSA.gov
Service brakes, hydraulic, power assist, vacuumOct 1, 2020
General Motors LLC (GM) is recalling certain 2018 Cadillac Escalade, Chevrolet Silverado 1500 and Tahoe, GMC Sierra 1500 and Yukon vehicles equipped with either a 5.3L or 6.2L V8 engine. The output of the mechanical vacuum pump can decrease over time, decreasing the amount of vacuum/power brake assist.
A decrease in brake assist can increase the brake pedal effort and distance required to stop the vehicle, increasing the risk of a crash.
GM will notify owners, and dealers will reprogram the Electronic Brake Control Module, free of charge. The recall began November 11, 2020. Owners may contact GM customer service at 1-866-522-9559, Cadillac customer service at 1-800-458-8006 or Chevrolet customer service at 1-800-630-2438. GM's number for this recall is N202300860.
Campaign 20V603000 on NHTSA.gov
Service brakes, hydraulic, antilock/traction control/electronic limited slip, wheel speed sensor/tone ringOct 24, 2019
General Motors LLC (GM) is recalling certain 2015-2020 Chevrolet Suburban, Tahoe, and GMC Yukon, and 2014-2018 Chevrolet Silverado 1500 and GMC Sierra 1500 vehicles equipped with a 5.3-liter engine, a 3.08-ratio rear axle and four-wheel drive. If a wheel-speed sensor fails, while the vehicle is traveling between 41 and 60 mph in four-wheel or automatic mode, the Electronic-Brake Control Module (EBCM) software may activate the driveline-protection system.
Unintended activation of the driveline-protection system will cause unintended braking on the wheel on the opposite side of the failed sensor, causing the vehicle to pull to one side unexpectedly, increasing the risk of a crash.
GM will notify owners, and dealers will reprogram the EBCM, free of charge. The recall began December 11, 2019. Owners may contact Chevrolet customer service at 1-800-630-2438 or GMC customer service at 1-800-462-8782. GM's number for this recall is N192261050.
Campaign 19V761000 on NHTSA.gov
Service brakes, hydraulic, power assist, vacuumSep 6, 2019
General Motors LLC (GM) is recalling certain 2015-2017 Cadillac Escalade, 2014-2018 Chevrolet Silverado, GMC Sierra, 2015-2018 Chevrolet Suburban, Tahoe, GMC Yukon vehicles. The amount of vacuum created by the vacuum pump may decrease over time.
As the vacuum level drops, the brake assist decreases, increasing braking effort, extending the distance required to stop the vehicle, thereby increasing the risk of a crash.
GM will notify owners, and dealers will reprogram the Electronic Brake Control Module, free of charge. The recall began October 8, 2019. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-458-8006 or GMC customer service at 1-800-462-8782. GM's number for this recall is N192268490.
Campaign 19V645000 on NHTSA.gov
Representative owner complaints
304 reports, newest first.
Power train, Fuel/propulsion system, Jun 13, 2019
WHEN 1ST CRANKING TRUCK AND PUT IN DRIVE MOTORS RREV UP AND SHIFTS HARD TO SECOND. OCCASIONALLY WHEN I OUT IN REVERSE IT WILL SIT THERE N NOT SHIFT IN. THEN WHEN IT DOES IT SHIFTS HARD. WHEN ACCELERATING THE TRUCK IT SOUNDS LIKE A CLATTERING SOUND UNDER DRIVERS SIDE UNDER HOOD. TRIED DIFFERENT TYPE OF GASOLINE AND NOTHING CHANGES. GMAC NEEDS TO DO A RECALL ON BOTH OF THESE ITEMS. I AM VERY DISAPPOINTED IN MY GMC AND GMAC
Power train, May 11, 2019
DAILY THE TRANSMISSION HAS A HARD SHIFT FROM 1ST TO 2ND GEAR. POTENTIALLY CAUSING ME TO LOOSE CONTROL OF THE VEHICLE. IVE HAD IT IN THE GMC SHOP 3 TIMES AND GMC IS UNABLE TO FIX THE PROBLEM. AFTER THE VEHICLE SITS FOR PERIODS OF 4 HRS OR MORE THE PROBLEM REOCCURS. THIS IS A SERIOUS POLITICAL SAFTEY HAZARD IN THE 8SPEED TRANSMISSION AND NEEDS TO BE RECALLED AND FIXED WITH A NEW TRANSMISSION.
Other or unspecified, Fuel/propulsion system, May 6, 2019, crash
THE SIERRA SURGES FROM PARK TO REVERSE AND DRIVE. I BUMPED A VEHICLE TODAY, AND THE SURGE HAS BECOME AN ISSUE THIS WEEK AND THERE IS NOT EVEN 9,000 MILES ON THE TRUCK. THE AFM IS ROUGH SHIFTING BETWEEN V8 AND V4 MODE TOO. NONE OF THIS WAS AN ISSUE UNTIL RECENTLY. MY SPEAKERS ALSO VIBRATE LIKE A BLOWN SPEAKER ON HIGH DEFINITION RADIO, BUT NOT ON REGULAR RADIO STATIONS.
Power train, May 3, 2019
AT 40MPH LOUD BANG FELT LIKE WE WERE REAR ENDED, SOUNDED LIKE WE WERE REAR ENDED, HUGE JOLT FORWARD NEARLY CAUSING ACCIDENT, POSSIBLE BACK INJURY, SEATS JOLTED, LOOKED BEHIND US AND NOTHING THERE. WAS DRIVING AT 30-35MPH AND JUST ACCELERATED SLIGHTLY TO PASS A CAR WHEN THIS HAPPENED. CITY STREET 3 LANES. DEALER TURNED US AWAY BECAUSE COULD NOT DUPLICATE FOR THEM. GMC SAID CASE WAS ACCELERATED NO CALL BACK AS OF YET.
Power train, Apr 29, 2019
TRANSMISSION HAS SHUDDER AND NOW WONT DOWNSHIFT PROPERLY WHILE DRIVING
Power train, Apr 15, 2019
DOCUMENT ID 4605342 #16-NA-361 : INFORMATION ON TRANSMISSION HARSH 1-2 SHIFT UPON FIRST START UP/SHIFT OF THE DAY UNDER LIGHT THROTTLE THIS GM BULLETIN WAS ISSUED JUL 21, 2017 ON NUMEROUS VEHICLES AND ACCORDING TO THIS BULLETIN THE PROBLEM DOES NOT HAVE A RESOLUTION. THE BULLETIN CLEARLY STATES CHANGING THE ENTIRE TRANSMISSION WILL NOT SOLVE THIS ISSUE. THIS IS AFFECTING MY GMC WITH THE 8 SPEED TRANSMISSION. GM HAS KNOWN ABOUT THIS ISSUE BUT HAS NONE THE LESS SOLD THE VEHICLES TO CONSUMERS WITHOUT DISCLOSURE. NEITHER GM OR DARREL WALTRIP GMC IN FRANKLIN TN DISCLOSED THIS ISSUE PRIOR TO THE SALE. THE SERVICE DEPT AT THE DEALER ADMITTED THE ISSUE CANNOT BE REPAIRED AND TOLD ME GM IS UNWILLING TO DO A TRADE ASSISTANCE OR BUYBACK. GM CLAIMS NOTHING IS WRONG WITH MY CAR YET HAS A CLEAR DOCUMENT THAT SAYS OTHERWISE.
Power train, Apr 2, 2019
WHILE THE TRUCK IS IN MOTION AND WHEN ACCELERATING AROUND 15-20 MPH THE TRANSMISSION WILL SOMETIMES "HUNT" FOR A GEAR CAUSING THE TRUCK TO NOT ACCELERATE. THIS RESULTS IN A MILD JERKING OF THE TRUCK WHEN IT IS TRYING TO ACCELERATE AND FEELS LIKE THE TRANSMISSION IS SLIPPING/SKIPPING. THIS IS MORE APPARENT WHEN GOING UP A GRADE VERSUS ON A FLAT SURFACE. SO I HAVE TO PUSH HARDER ON THE GAS PEDAL WAITING FOR THE TRUCK TO SHIFT. THIS IS A SAFETY ISSUE SINCE WHEN NOT PROPERLY ACCELERATING INTO TRAFFIC, AN ACCIDENT IS MORE LIKELY TO OCCUR. I SEE THAT THIS ISSUE HAS ALREADY BEEN REPORTED IN ANOTHER INCIDENT ON YOUR WEBSITE. I HAVE HAD THIS ISSUE SINCE I BOUGHT THE TRUCK ON 02/2018 AND THE REASON I HAVE WAITED TO REPORT IS DUE TO THE DEALER STATING TO ALLOW THE COMPUTER TO UPDATE/LEARN YOUR DRIVING HABITS. I HAVE 11,000 MILES ON THE TRUCK NOW AND STILL EXPERIENCING THE ISSUE.
Exterior lighting, Mar 8, 2019
PASSENGER SIDE HEADLIGHT JIGGLES UP AND DOWN CONSTANTLY OVER EVERY SMALL BUMP. VERY DISTRACTING AND LEAVES MANY BLACK AREAS ON THE ROAD FROM LACK OF LIGHT. FIX THIS IMMEDIATELY!
Service brakes, Feb 28, 2019
DRIVING SLOWLY IN BUMPER TO BUMPER TRAFFIC. I WAS STOPPED WITH MY FOOT ON THE BRAKES, AND THE TRUCK STARTED MOVING FORWARD. I THOUGHT ENGINE SURGE, BUT IT WAS NOT. I PUMPED BRAKES HARD AND THE TRUCK STOPPED. THIS HAS HAPPENED 2 TIMES.
Power train, Feb 14, 2019
EXTREMELY HARD SHIFTING ON LOWER GEARS. WHEN SLOWING WHEN IT GOES FROM 2ND TO 1ST IT FEELS LIKE I GOT REAR-ENDED. NOT ALL THE TIME BUT ONCE A DAY AT LEAST. IT ALSO SHUDDERS WHEN SLOWLY ACCELERATING IN TRAFFIC, SOMETIMES THE RPM GOES WAY HIGH AND IT LURCHES FORWARD WHEN IT UPSHIFTS.
Service brakes, Feb 13, 2019
I WAS IN THE BANK ATM DRIVE THROUGH AND THE GUY AHEAD OF ME STARTED TO GO, I BARELY PUSHED THE GAS PEDAL AND HE DECIDED TO STOP. I HIT MY BRAKES AND THE TRUCK WAS HARD TO STOP, ALMOST LIKE THE GAS PEDAL RESPONSE WAS STILL IN THE GO MODE BEFORE IT HAD THE CHANCE TO REACT TO MY INPUT OF TAKING MY FOOT OFF THE GAS TO APPLY THE BRAKES. I CAN DUPLICATE THIS BEHAVIOR ALL THE TIME.
Exterior lighting, Feb 8, 2019
PASSENGERS SIDE LOW BEAM JIGGLES UP AND DOWN WHEN GOING OVER SMALL BUMPS. DEALER TELLS ME ITS A COMMON ISSUE WITH THE PROJECTOR STYLE HEADLIGHTS BUT CANNOT BE REPLACED UNDER WARRANTY UNTIL GM RECOGNIZES IT.
Power train, Jan 8, 2019
BRAND NEW 2018 SIERRA 1500 Z71. WHEN DRIVING THE TRUCK FOR THE FIRST TIME AFTER SITTING FOR A NUMBER OF HOURS (6+HRS) THE TRUCK EXPERIENCES A "HARD" 1-2 SHIFT. THIS OCCURS 100% OF THE TIME WHEN I LEAVE FOR WORK IN THE MORNING. SOMETIMES IT FEELS LIKE THE TRANSMISSION SLIPPED, THIS IS THE HARD SHIFT FEELING. OTHER TIMES THE TRUCK LOSES ACCELERATION, CUTS OUT, FEELS LIKE THE TRUCK HAS RAN OUT OF FUEL. ONLY HAPPENS WHEN THE TRUCK HAS BEEN SITTING FOR A LONG PERIOD. WHEN I TOOK THE TRUCK IN TO HAVE THIS LOOKED INTO I WAS TOLD THIS IS A KNOWN ISSUE WITHOUT A RESOLUTION. IVE ATTACHED A SCAN'D COPY OF THE DOCUMENT THEY GAVE ME #16-NA-361.
Electrical system, Other or unspecified, Service brakes, Dec 21, 2018
MY VEHICLE IS HACKED ANYTIME I AM DRIVING THE VEHICLE I AM NOT IN FULL CONTROL. THE VEHICLE STEERS ITSELF LEFT OR RIGHT WHILE DRIVING, THE BRAKES ARE ALWAYS ON WHILE DRIVING SOMETIMES BRAKING HARDER BUT ALWAYS ON. THE INFOTAINMENT SYSTEM HAS MANY GLITCHES. THIS VEHICLE HAS BEEN BACK TO THE DEALERSHIP MORE THAN 15 TIMES HAS BEEN OUT OF SERVICE OVER 35 DAYS GM EVEN FLEW A ENGINEER/TECH TO INSPECT THE VEHICLE AND SAYS THEY COULDNT FIND ANYTHING. THEREFORE THIS VEHICLE IS HACKED THERE ARE SO MANY ISSUES AND GLITCHES AND THE FACT THAT THE TRUCK ONLY ACTS LIKE THIS WHEN I AM DRIVING NO ONE ELSE. LIKE IT CAN BE TURNED ON AND OFF INSTANTLY. I HAVE TONS OF VIDEOS PICTURES AND SUPPORTING DOCUMENTS BACKING THIS. I NEED HELP THIS IS A SERIOUS ISSUE AND THERE IS SO MUCH MORE TO IT THAN I CAN TYPE HERE SOMEONE PLEASE GET AHOLD OF ME TO HELP OR POINT ME IN THE RIGHT DIRECTION. THIS VEHICLE WILL BE RETURNED TO GM SOON AS THEY ARE DOING A VEHICLE REPLACMENT PER ALL THE ISSUES BUT THIS NEEDS FURTHER ATTENTION BECAUSE IF THIS CAN HAPPEN TO ME IT CAN HAPPEN TO ANYONE . PLEASE HELP
Steering, Dec 10, 2018
THE TRUCK WAS BEING TURNED ON TO RESUME DRIVING AFTER BRIEF STOP. THE VEHICLE ENGINE TURNED ON BUT VEHICLE STEERING LOCKED, FRONT AND REAR EXTERIOR LIGHTS WENT OUT. AFTER TRUCK TURNED OFF FOR 20 MINUTES. THE STEERING WHEEL UNLOCKED, THE EXTERIOR LIGHTS TURNED BACK ON. I CALLED GMC ROADSIDE SERVICES-!THEY RECOMMENDED TOWING VEHICLE TO DEALERSHIP.
Structure, Dec 5, 2018
THE SUNROOF IN THE 2018 GMC SIERRA EXPLODED OUTWARD OF THE VEHICLE, DROPPING GLASS SHARDS INTO THE CABIN. THE VEHICLE WAS IN MOTION AT ABOUT 15 MPH IN A NEIGHBOORHOOD STREET WITH NO OVERHANGING OBJECTS THAT MAY HAVE CONTACTED THE GLASS. THE WEATHER FORECEAST FOR THE DAY WAS SUNNY WITH A HIGH OF 76 DEGREE FAHRENHEIT. NO EXTERNAL CONTACT WAS MADE TO THE SUNROOF GLASS PRIOIR TO THE INCIDENT. NO INVESTIGATION WAS DESIRED BY BOTH THE LOCAL DEALERSHIP OR GENERAL MOTORS ON THE INCIDENT ITSELF. BOTH HAVE DIRECTED ME TO MAKING AN INSURANCE CLAIM TO RECTIFY THE SITUATION.
Engine, Fuel/propulsion system, Nov 21, 2018
FUEL INJECTION SEALS #4 O-RING SPLIT - LEAKING FUEL - POOLING GAS ON MANIFOLD. TOOK VEHICLE IN FOR SMELL OF GAS, LACK OF ACCELERATION AND POOR GAS MILEAGE. THIS IS KNOWN ISSUE BASED ON THE SERVICE BULLETIN 18-NA-137 - VEHICLE HAS LESS THAN 6000 MILES
Wheels, Nov 17, 2018
NEW TRUCK WITH 15 MILES. BAD VIBRATION SEEMS TO BE COMING FROM BOTH FRONT AND REAR AREA AT SPEEDS OF 64 TO 72 POSSIBLE TIRES OUT OF BALANCE OR ALIGNMENT.
Power train, Wheels, Nov 6, 2018
SINCE DAY 1 OF PURCHASING NEW,TO CURRENT DATE, THERE IS VIBRATION AT IDLE. THERE IS VIBRATION AT HIGHWAY SPEEDS OF 60 MPH PLUS. IT HAS BEEN TO THE DEALER 5 TIMES FOR TESTING. THIS IS A KNOWN PROBLEM WITH THOUSANDS OF VEHICLES. GM SAYS IT MEETS THEIR SPECIFICATIONS. THE DEALER BALANCED THE TIRES 3 TIMES, NO LUCK. THE DEALER REPLACED THE TIRES, SAME ISSUE. I AM TOLD THE VIBRATION AT IDLE IS NORMAL. THIS PROBLEM IS DISTRACTING WHEN DRIVING. I HAVE BEEN DEALING WITH GM AND THE DEALER FOR 7 MONTHS WITH NO RESOLVE. HTTPS://WWW.KSHB.COM/NEWS/LOCAL-NEWS/INVESTIGATIONS/GENERAL-MOTORS-CUSTOMERS-FRUSTRATED-OVER-SHAKING-IN-PICKUP-TRUCKS THIS LINK OF A NEWS CLIP SHOWS WHAT IS HAPPENING TO MY VEHICLE. THIS HAPPENS EVERY DAY, SO IGNORE THE DATE I ENTERED BELOW. I HAVE VIDEOS BUT THE FILE IS TOO LARGE TO DOWNLOAD. *TR
Steering, Nov 5, 2018
I WAS DRIVING 70 MPH DOWN HIGHWAY 75 IN MCKINNEY TX, WHEN MY STEERING COMPLETELY LOCKED UP. LUCKILY I MANAGED TO GET TRUCK STOPPED AND TOWED BACK TO DEALER. THIS COULD EASILY HAVE BEEN A FATALITY ACCIDENT.
Visibility/wiper, Sep 11, 2018
I AM 6'8 AND HAVE NOTICE A SERIOUS INCREASE IN THE BLIND SPOT BEHIND THE REAR VIEW MIRROR. ON APPROACHES TO INTERSECTION, VEHICLES ARE HIDDEN AND I HAVE HAD 3 BEAR MISS COLLISIONS IN THE THE SAME NUMBER OF MONTHS. THIS IS MY 3RD GMC SIERRA AND THE ISSUES APPEARS TO BE RELATED TO ELEVATED SEAT WHICH CAN NOT BE LOWERED TO A SAFE LEVEL.
Steering, Jul 1, 2018
WHEN DRIVING THE VEHICLE IT STEERS VERY HARD LIKE A LACK OF POWER STEERING THAN ALL OF A SUDDEN IT FEELS LIKE THE POWER STEERING KIKS IN CAUSING A OVER STEERING SITUATION . FEELS LIKE YOU HAVE NO CONTROL. HAVE TALKED TO OTHER OWNER WHO HAS SAME ISSUE. PICKUP HAS 40 MILES ON IT. IT HAPPENS EVERY TIME I DRIVE IT.
Steering, Jun 20, 2018
WHEN IN TRAFFIC AT ANY SPEED THE STEERING WHEEL WILL ACTUALLY TURN TO THE LEFT. IT TAKES YOU BUY SURPRISE AND IT'S A STRANGE FEELING. I WAS TOLD BY THE DEALER THEIR IS NO ISSUES. VERY SCARY! IT HAPPENS AT ANYTIME AND WITHOUT WARNING.
Steering, Apr 30, 2018
STEERING PULLS TO LEFT WHEN DRIVING AT ANY SPEED, AND TERRAIN. PULLS ENOUGH TO TURN YOU INTO ONCOMING TRAFFIC IF YOU DO NOT CORRECT. TOOK TO DEALERSHIP AND WAS TOLD NOTHING WAS WRONG WITH THE TRUCK. STEERING PROBLEM CONTINUES AND IS DEFINITELY A SAFETY ISSUE.
Other or unspecified, Apr 15, 2018
THE VEHICLE OPERATES UNPREDICTABLY WHEN PRESSING ON THE GAS PEDAL CAUSING UNSAFE DRIVING CONDITIONS. WHEN PRESSING THE GAS PEDAL, ANY ONE OF THE FOLLO^WING CONDITIONS MAY OCCUR. 1.) SOMETIMES THE RPM'S DECREASEA. 2. )SOMETIMES THE TRANSMISSION HUNTS SEVERAL TIMES. 3.) SOMETIMES THE VEHICLE SPEED SURGES. 4.) MANY TIMES THE ENGINE HESITATES FOR A LONG PERIOD BEFORE THE RPM'S INCREASE. THIS UNPREDICTABLE OPERATION IS MORE APPARENT WHEN THE ENGINE IS LOADED LIKE GOING UP HILLS AND ESPECIALLY WHEN HEADING INTO STRONG WINDS. THE UNPREDICTABLE OPERATION IS EXTREMELY UNSAFE WHEN DRIVING ON ICE COVERED ROADS. THIS VEHICLE IS ALSO CONSIDERED AN "OFF-ROAD" SERIES VEHICLE. THIS UNPREDICTABLE OPERATION IS VERY UNSAFE, EVEN DANGEROUS, ON AGGRESSIVE TRAILS. WHEN DRIVING IN STEEP TRAILS, DRIVERS REQUIRE FEEDBACK FROM THEIR VEHICLE ESPECIALLY HOW THE VEHICLE OR ENGINE RESPONDS AS THE GAS PEDAL US DEPRESSED.