Table 1 shows one common engine and engine cooling related problems of the 2026 Chevrolet Colorado.
| Problem Category | Number of Problems |
|---|---|
| Engine And Engine Cooling problems |
The vehicle developed a rapid and moderate shudder followed by "check engine", "service traction control", "service esc" messages and associated icons on the driver display. The shudder happened a second time within approximately 30 seconds and the engine lost power followed by "reduced power warning" message. I engaged the emergency flashers and limped to the nearest side road. I had to stop on the road because of no shoulder. I waited there while assessing the situation and eventually was able to drive the short distance home. I disconnected the battery to reset the pcm. This action temporarily cleared the fault code and check engine light. The first dealer said it couldn't do anything without a fault code. A second dealer said it was unable to duplicate the malfunction. Two weeks later the vehicle began to shudder on a busy interstate, with the same warning lights and messages and had to pull off the interstate. It happened once more on the way home. The dealer duplicated the issue. It took them over 30 days with multiple repair attempts. The dealer replaced all four fuel injectors, fuel injector wiring harness, engine control module (ecm), and wiring between the ecm and another connector. The dealer had to reach out to gm's technical assistance team (tac) to get it back on the road again. Approximately 8 weeks later, the vehicle began to shudder again, this time only while travelling up hills. There has not been any messages or warning lights associated with this event. The vehicle was taken back to the dealer where is has been now for almost a week with no follow-up on the diagnosis or repair status. These events compromised safety and we were put at risk due to the sudden lack of power while in traffic, maintaining control of the vehicle while trying to understand the situation, and the possibility of other drivers adversely reacting to these events.
Component: drivetrain, brake, and engine management systems repeatedly fail in a coordinated pattern, with multiple warning indicators activating simultaneously and sudden unintended deceleration occurring without warning. Vehicle available for inspection. Safety risk: most recent failure occurred at highway speed with family including passengers in the vehicle. Without warning, the vehicle decelerated abruptly while multiple dashboard warnings activated at once. Sudden deceleration at highway speed creates immediate risk of rear-end collision from following traffic and loss of vehicle control. Prior dealer confirmation: yes. Curry Chevrolet (scarsdale, NY) has had the vehicle in service for the same defect category on multiple prior occasions, including stays of over a week on at least two visits. The dealer has not permanently resolved the issue — symptoms have now recurred at sixth time. An additional early service visit at the same dealer was not documented with a repair order; I retain contemporaneous text messages establishing that visit occurred. Other inspections: inspected only by curry Chevrolet to date. Gm customer assistance engaged (case #xxx). No police, insurance, or independent inspections. New case has been filed with gm, linked to the previous (case #xxx). Next service visit will be at a different authorized Chevrolet dealer for an independent diagnostic. Warning indicators: yes. In the most recent incident, multiple warning lamps and system alerts activated simultaneously at the moment of deceleration, with no advance warning. Prior incidents showed the same multi-system warning pattern, consistently without predictive indicators. Vehicle is a 2026 Chevrolet Colorado, VIN [xxx], delivered January 2026 with 2,209 miles on the odometer at delivery. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).
Ecm engine control module tcm transmission range sensor tcm transmission control module while driving in a 45 mph speed zone in heavy traffic, the vehicle suddenly lost power and abruptly slowed down causing a number of other vehicles to have to break and swerve . Problem confirmed through onstar diagnosis as of this date, the gm dealer has not confirmed the problem. No other inspections have been confirmed. There were no warnings prior to the event.