2018 Chevrolet Colorado

While driving at normal and safe highway speeds, without warning (no audible or visual warning from the vehicle information display) my vehicle experienced engine lockout, loss of all non-electric power, and no control over vehicle speed. A few seconds after loss, the information display did show a "check engine light" and that the engine was in "lockout." We (my spouse, young child, and self) were surrounded by multiple commercial semi-trucks and passenger vehicles and had to weave and serve to avoid collisions at highway speeds and get to the shoulder of the highway in a few seconds. The root cause as diagnosed by a Chevrolet Dealership Service Department was failure of the magnetic strip that is press fit to the reluctor (tone) wheel. A 1/2in piece of the magnetic strip was missing and over 10 cracks within the strip itself observed. This magnetic strip is used by the Engine Control Module to measure engine RPMs. The strip's failure caused the EMC to shutdown the engine without warning which is a significant hazard for controlled vehicle movement at highway speeds. My vehicle's engine (LWN) is one of the few GM designs that have the press fit magnetic strip reluctor wheels. The rest use integrated wheels with the crankshaft or traditionally stamped steel with machined teeth. The vehicle and reluctor wheel has not been inspected by GM or any other representatives. I offered to send images to GM for records but they declined.

NHTSA ID

11754282

Incident

Jul 8, 2026

I purchased the truck at the end of March 2025. Within a few weeks I was noticing different issues in the transmission. It would occasionally shudder, have jerky or long shifts, would jump gears and lose power. The shudder was random but mostly on the highway, the jerky or long shifts would mostly occur when the egjne was cold and more often in cold weather. The lose of power and jumping gears would occur when towing and when I was in the mountains, once losing power as I was turning onto a major highway. I took the truck in three times to get diagnosed but they couldnt replicate the issue or find a code. I finally decided to pay for a flush with the fluid that was recommended by a TSB. After the flush the issues were then replicated by the service techs. I have an extended warranty. The representative then inspected the truck and found the same issues and approved a transmission replacement. I took the truck in on June 22nd 2026. As of July 21 the dealership is still waiting for the replacement transmission to be shipped from GM.

NHTSA ID

11751922

Incident

Apr 20, 2026

66,500 miles transmission shudder. Scenic Chevrolet advised the torque converter failed and damaged the transmission.

NHTSA ID

11750843

Incident

Jul 11, 2026

The contact owns a 2018 Chevrolet Colorado. The contact stated that while the vehicle was parked, the key was difficult to remove from the ignition. The dealer was contacted and informed that the shift interlock switch failed to recognize that the transmission was shifted to park(P). The vehicle was not repaired. The manufacturer was contacted, but offered no assistance because the vehicle was not under warranty. The failure mileage was approximately 60,000.

NHTSA ID

11750525

Incident

Jul 15, 2024

Mileage

60,000 mi

My 2018 Chevrolet Colorado diesel has had repeated diesel emissions/DPF-related failures that cause the vehicle to enter reduced-power or limp mode. This is a safety issue because the truck suddenly loses power and cannot accelerate normally. The most serious incident occurred while driving over Santiam Pass in Oregon. The vehicle went into reduced-power/limp mode on a mountain highway, leaving me unable to maintain normal speed or accelerate safely. I lost power needed to pass traffic and had limited ability to respond to road conditions. The problem has happened several times. It has also occurred while I was towing my boat, which left me unable to continue the trip safely and created a hazardous situation because the truck could not maintain normal towing power. The issue appears related to the diesel particulate filter/emissions system and repeated DPF/regen or exhaust aftertreatment problems. I am concerned that a design, calibration, or emissions-system defect is causing sudden power reduction during normal driving and towing. This creates an unreasonable safety risk, especially on mountain passes, two-lane highways, and while towing. I am requesting that NHTSA review this as a potential safety defect involving the 2018 Chevrolet Colorado diesel DPF/emissions system and reduced-engine-power strategy. I am also requesting that this complaint be considered with any similar complaints, recalls, technical service bulletins, or emissions campaigns related to DPF regeneration, particulate matter sensor diagnostics, reduced engine power, or limp mode on the 2.8L Duramax Chevrolet Colorado.

NHTSA ID

11748528

Incident

Jul 7, 2025

Power steering failure, without incident. It started one morning, after turning off truck the previous day. Warning lights displayed as soon as truck was started. Very difficult to turn steering wheel. Too dangerous to drive. Dealer indicated the steering rack should be replaced.

NHTSA ID

11742439

Incident

Jun 4, 2026

Engine fails it violenty thumps and studders and drops from highway speed with no warning. This is a mfg. defect and also an EXTREME SAFETY CONCERN. The engine studders and thumps and we were almost rear ended by a truck when our truck could not go into gear properly. It is very scary! Dealership confirmed that they have many vehicles with same issue and recommended a Super Flush of transmission but not sure this will correct problem or cause more problems. There is no warning when these incidents occur and the driver has no control to avoid it. It is commonly referred to as the Chevy thump and studder and a known mfg defect in which GM refuses to pay for repairs causing consumers an extreme hardship! This is an ongoing issue affecting thousands of vehicles and someone is going to die! There is no negligence of operator of vehicle, it is a manufacturing defect that affects thousands of GM vehicles and they are doing NOTHING about it except expecting customers to keep incurring cost to try to remedy a repair at our own expense which is unfair! The government needs to force a recall at GM's expense!

NHTSA ID

11741750

Incident

May 23, 2026

Luggage and shudders at cruise speed, seems like auto transmission is coming apart. Paid $500 for the trans flush the service bulletin suggests but didn’t help, shop quoted a $8000 replacement on a vehicle with 60k miles. This should be a recall

NHTSA ID

11714360

Incident

Dec 5, 2025

PI to help diagnose A/C concern

This PI provides diagnostic tips for diagnosing electric trailer brakes issues.

This PI provides diagnostic tips for diagnosing electric trailer brakes issues.

This preliminary information communicates information about how to determine if a wheel and tires size change is available.

This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.

This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.