2018 Chevrolet Colorado UNKNOWN OR OTHER

Saturday July 12, 2025: My truck got an ACTION Required notice: "Exhaust fluid Quality Poor See Owners Manual NOW 100 miles until 65MPH Max speed" I turned around and returned home to get a different vehicle to do what i needed to do. Monday, July 14 My mechanic hooked it up to the vehicle scanner and got the code information: "P11D5: NOx Sensor 2 Exceeded Minimum Learning limit (Symptom 00) - Current DTC, Test failed since DTC Clear, History DTC, Test not passed since power up, warning indicator requested" So we ordered and replaced the Sensor, still the action required message remains... I am now down to "64 miles to 55mph Max Speed" and my dealership is telling me there is nothing more that can be done, unless i want to pay up to 5k for additional repairs that in their experience may NOT fix the issue?? I've googled the issue and MANY MANY people complain of this issue and there appears to be no actual fix for it.... GM tells me that im out of luck and they have no information regarding a fix or remedy for the situation!

At the beginning of November I was out shopping, when I returned to my vehicle, the driver side door would not open. Luckily I was fit enough to crawl through from the passenger side. I promptly called the Chevy dealership for an inspection/ repair. I feel this was an emergency situation. I didn’t even want to think about what would happen if I were in a vehicle accident, and couldn’t get out, or, no one could get in. I was able to get an appointment at the dealership for November 16, 2023. My Chevy is always parked in covered garage, there was no warning sign of anything going wrong. They checked it at my appointment, but because they couldn’t open it, they decided to order all the assembly parts, which I had to pay for ahead of time. My next appointment for the repair wasn’t set till January 31, 2024. I never knew how important a functional door would be. Very inconvenient, and dangerous.

We have been complaining to the dealerships (2) since 2021 about a spontaneous outage of the Infotainment system. Each time we were told there was no problem. They claimed to have contacted GM, who said 'no problem' or so we were told. The 'problem' has become a serious safety issue for myself. It starts with a loud constant ‘ticking’ sound that begins after getting seated, even before the key is placed in the ignition and does not stop. The radio rolls a list of station numbers even when nothing is on making it very distracting. Listening to the radio has become impossible. This system malfunction has created a more serious problem for me. At my height, the view of the speedometer reading on the dashboard is blocked by the steering wheel making me dependent on the mph display directly in front of the steering wheel, and is part of the Infotainment system, which keeps going off and I have no way to watch or judge my speed safely. It also interferes when using gps and causes a loss of direction. This is just downright dangerous. As obvious as the problem is, the current dealership requires a $190 diagnostic fee with repair costs to follow. This system was not an option or add-on. We could not break it or wear it out. Now out of warranty GM refuses any responsibility. Why no recall? Many complaints stated on social media.

The check engine light came on because the coolant fan runs for a while after vehicle is shut off. This ended up being due to a thermostat failure. I did have this repaired in Novemver 2023 but what is interesting is that one of my sisters, who also owns a Chevy Captiva had this same thing repaired earlier in 2023 and now my other sister who owns a Chevy Equinox has this same issue now, 2/5/24, and will look into having it repaired. Is this just a coincidence or is this a defective problem that the manufacturers should address?

The beginning of November my driver side door would not open. There was no warning, and nothing happened to cause this. I took it to the dealership. For $161.00 they told me I would need $980.00 worth for parts, which I had to pay upfront, so they would order them. Needless to say there is only one mechanic that is able to do this repair, so I’m still waiting. My appointment is on January 31. I feel this has been a big hazard, do to no fault of my own. I’m just Grateful that [XXX] I can climb through to still use the truck. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

For at least 6 months now My ignition key goes in and starts normally. When parked the key goes back one notch and freezes. Cannot pull it out or put back to off position. This is sporadic. Have been to 2 Chevrolet dealers who simply stated they cannot duplicate the issue so they don't want to throw parts at it. On you tube there are many videos of how people are handling this.. If I had a emergency run to a hospital or something of a time constraint I cannot do it because i am stuck for at least a half hour until it moves again. Now about $280.00 into diagnostic fees that Chevrolet claims they know nothing about so they are doing nothing. Imagine that click the key 5 or 6 times video it and then say cannot duplicate the problem. I hope this leads to someone acknowledging an issue. Thanks

UNABLE TO REMOVE KEY FROM IGNITION SWITCH. ENGINE SHUTS OFF, BUT IGNITION IS STILL ON. IN SHORT TIME THE BATTERY GOES DEAD. PER THE DEALER, THE CUSTOMER NEEDS TO LIFT HOOD AND DISCONNECT NEGATIVE BATTERY CABLE TO PREVENT THE BATTERY FROM DYING AND THE VEHICLE NEEDING TOWING. MOST CUSTOMERS UNDER THE HOOD WITH WRENCHES IS A DANGEROUS SITUATION. PER THE INTERNET THIS IS COMMON WITH THIS VEHICLE, AND THE DEALER FIX IS NOT A SURE CURE. GM NEEDS TO INVESTIGATE AND COME UP WITH A PERMANENT FIX THAT DOES NOT LET CUSTOMERS STRANDED, CARRYING WRENCHES, AND WORKING UNDER THE HOOD TO KEEP GOING, ESPECIALLY AT NIGHT.

The HVAC module temp door is cracked, as previously seen in the 2015-2016 recall for Chevrolet Colorado’s and GMC Canyons. This forces the temperature to be 33 degrees F colder than requested. This poses a risk to those that live in cold winter climates, as there is no heat available in the vehicle.

While driving my truck overheated and Antifreeze was leaking inside the car. Due to the antifreeze leaking my windows were fogging up pretty quickly and I couldn’t see. Therefore having to stop in the middle of the road cause I could t see almost getting hit. Now I can not drive the my car due to the smell making my kids and myself sick. It also states in the paper work after buying my truck new that this is a defect part. This would be a heater core. Thanks for this heater core being inside the truck I almost was hurt.

The key repeatedly will not turn to off position and cannot be removed from ignition. This results in my having to leave the key in the ignition. IE: at the grocery store, at the post office, at the drug store etc. I have taken to dealership. The first time for 2 days and they said they could not duplicate the problem. The 2nd time it happened in the service drive. The service advisor saw it but the technician said could not duplicate. This could result in stolen vehicle or dead battery depending how long I have to leave in the on position. The TSB on this says replace shifter control assembly.

2018 CHEVROLET Colorado...when driving if a side window is dropped less than an inch, vehicle shakes, vibrates and make odd noises. Raise all windows and vehicle runs smoothly. Many drivers are reporting the same problem online. Both the Colorado and same GMC vehicle having same problem. When a window is lowered the vehicle vibrates and shakes violently...one has to drop down to 30 miles and hour to make it safe to drive. Seems like a problem GMC should be able to repair without much trouble.

CAB VIBRATION 70 MPH TO 75 MPH

INTERMITTENT PROBLEM WITH IGNITION KEY NOT BEING ABLE TO BE REMOVED. SEEMS TO BE RELATED TO THE SHIFT LEVER, MOVING THAT BACK AND FORTH CAN USUALLY RECTIFY THE PROBLEM AFTER MANY ATTEMPTS. VEHICLE STATIONARY. *TR

AT SPEED AND ON ACCELERATION, VEHICLE PULLS INTERMITTENTLY AND SHARPLY. VEHICLE DRIVES ROUGH, TRANSMISSION SHIFTS ROUGH. TIRES SKIP UPON ACCELERATION FROM STOP. TIRES SHOW ABNORMAL TREAD WEAR ON INSIDE EDGE DESPITE PROPER INFLATION AND ALIGNMENT.

BAD RATTLING COMING FROM BACK TIRES WHEN COMING OUT OF DRIVEWAY. AND WHEN PASSING ANY BUMPS. HAS A SOUND ON LEFT TIRE THAT SOUNDS LIKE SOMETHING IS LOOSE. RATTLING SOUND IS GETTING WORST AND IT IS VERY ANNOYING. I LOVE MY TRUCK BUT I AM VERY DISAPPOINTED IN THE RATTLING SOUNDS. SOUNDS IT DID NOT MAKE WHEN I BOUGHT IT.

THE VEHICLE HAD JUST DRIVEN BACK FROM A 50 MILE DRIVE AND WAS THEN PARKED. THE VEHICLE WAS NOT RUNNING AND HAD BEEN PARKED FOR ABOUT 5 MINUTES WHEN A VEHICLE FIRE OCCURRED (STARTING IN THE ENGINE COMPARTMENT).

THE VEHICLE HAD JUST RETURNED FROM A 50 MILE TRIP WHEN THE VEHICLE WAS PARKED. THE VEHICLE WAS NOT RUNNING AND HAD BEEN PARKED FOR ABOUT 5 MINUTES WHEN THE FIRE STARTED (FROM THE ENGINE COMPARTMENT).

MAY 2018, MY WIFE AND I NOTICED AN OBNOXIOUS ODOR COMING FROM AC AFTER STARTUP AND BELIEVE AN AC ISSUE AS STARTS BLOWING COLD THEN WARM/HUMID THEN BACK COLD & IT PUTS OUT A MUSTY? SMELL THE SMELL GOES AWAY, BUT AFTER I HAVE STOPPED AND THEN RESTARTED TRUCK AFTER A COUPLE MINUTES AND DRIVE A COUPLE MORE MINUTES THE ODOR AGAIN PRESENTS ITSELF. IN JUNE TOOK THE TRUCK IN FOR SERVICE AND THEY SPRAYED THE AIR FILTER WITH A DISINFECTANT(?). THAT JUST MASKED THE SMELL FOR A DAY OR TWO, BUT THE ODOR STILL PRESENT. THE SERVICE TECH WAS NOT BEEN ABLE TO REPLICATE THE ISSUE. THIS IS STILL OCCURRING AND WE HAVE NOTICED THAT THE ODOR OCCURS WHEN USING HEAT TOO. INFORMED SERVICE ADVISOR IN DECEMBER WHEN TRUCK IN FOR WORK. ISSUE OF ORDER STILL CAN NOT BE REPLICATED.

5/20/18 AC ISSUES -- STARTS BLOWING COLD THEN WARM/HUMID THEN BACK COLD. INFORM SERVICE ADVISOR WHEN TOOK TRUCK IN (6/18/18) FOR SERVICE. TECH NOT FIND AC ISSUE. 8/7/18 TRUCK IN AGAIN -- AC STARTS BLOWING COLD AIR THEN PUTS OUT WARM/HUMID AIR THEN BACK TO COLD AIR. -- TEMP IS SET 72 AND OUTSIDE IS 85 - WHY DO I HAVE TO PUT ON AUTO TO GET COLD AIR TO BLOW OUT OR ADJUST DOWN TO GET? WHY ON AUTO IT WANTS TO FREEZE US AT 72 AND TEMP HAS TO BE ADJUSTED UP? TECH MONITOR DOORS WITH AC RUNNING & WERE WORKING AS DESIGNED -- NOTE THEY REPORT WAM TO COLD - NOT COLD TO WARM TO COLD AS I REPORTED. WELL THE ISSUE STILL HOLDS AND THE TRUCK'S CLIMATE CONTROL (BLENDING PROCESS) HAS AS ISSUE IN GETTING THE TEMP ADJUSTED ON STARTUP. 2/18/19 - ON MY DRIVE YESTERDAY WITH MY WIFE, TRUCK TEMP SET AT 74 AND OUTSIDE TEMP WAS 54 AND 40 MINUTES INTO DRIVE THE VEHICLE FOGGED UP THE SIDE WINDOWS AND I HAD TO TURN ON DEFROST. THEN THAT EVENING AS TEMP HAD DROPPED, WHEN TURNED ON TRUCK IT BLEW HOT THEN COLD THEN BACK TO HOT. THE BLENDING THAT THE SYSTEM IS DOING IS NOT WORKING CORRECTLY. NEED TO GO BACK TO THE MANUAL AC/HEAT CONTROL!