Truck wil stall and loose power to steering and brakes at low RPM (in turns or when stopping ) have recived letter from manufactuer about problem.

- Davisburg, MI, USA

The contact owns a 2004 Chevrolet Colorado. The vehicle misfired and the service engine warning light illuminated intermittently. There was a safety recall for the engine intake valve, however; no NHTSA campaign id was found. The dealer wanted to charge him $75 for the repair. The current and failure mileages were 65,000. The consumer provided documentation from GM Corp stating no cost for the defect. Updated 09/12/07

- Auburndale, FL, USA

My 2004 Chevrolet Colorado has had repeated a recurring problem where it will not respond to the throttle at all while driving. In all cases this has happened when the engine is warming up from a complete cold start in the morning. While driving at 45-50 miles per hour the engine will drop to idle speed and there is no response to throttle input. The dealer has had the vehicle in for service on this issue 5 times now and can nothing wrong. There are no codes set in the computer and the check engine light never comes on. The problem will clear itself after 20 to 30 seconds and may not occur again for weeks.

- Salem, OR, USA

The check engine light comes on accompanied by an engine misfire due to weak exhaust valve springs which must be replaced. Recently GMC issued a bulletin to their service departments advising mechanics on the issue, and recognizing the problem with the valve springs and how to fix it, but will not acknowledge a manufacturer's defect. According to the bulletin this problem occurs in all Chevrolet Colorados 2004-2006, GMC canyons 2004-2006, and the Hummer H3. The estimated cost of repair is about $2000, quoted by the dealer mechanic. Not only does the check engine light come on and stay on, it also causes the vehicle to stall while in operation. The truck shut down in the middle of the intersection while driving. Additionally you will have difficulty when you start your car, it will misfire and you may have to restart again. This will begin to happen regularly until you diagnose the problem. I went to different dealers to diagnose the problems because different mechanics could not find the problem with the check engine light. The last step was a dealer mechanic that had just received the above mentioned bulletin. They did not fix the problem with the valve springs, instead they reset the computer to stop the check engine light from occurring. The misfiring and stalling continued to happen.

- Lomita, CA, USA

Rattle or vibration at 2000 RPM. Dealer replaced part(s) but did not fix problem.

- Park Forest, IL, USA

: the contact stated that while waiting at the traffic light, the engine raced and accelerated as if it was engaging to 50 mph. In an attempt to prohibit the vehicle from accelerating, the clutch was engaged while depressing the brake pedal. There was also a sulphur smell inside the vehicle. The vehicle was taken to a service dealer who was unwilling to repair the vehicle without a fee. The vehicle was taken to an independent mechanic shop who discovered two trouble codes on the diagnostic computer system. The first was a PO300 random misfire code. The second was a P1133 front oxygen sensor slow and switching code. The check engine light from the panel was also constantly illuminated. The issues have gradually worsened since the vehicle was purchased.

- Branch Land, WV, USA

: the contact stated while driving 65mph up an incline the vehicle began to loose power. The next day the check engine light illuminated. After inspecting the vehicle the independent repair shop reset the check engine light. The problem has not returned.

- Carmel By The Sea, CA, USA

2004 Colorado truck stalled without warning at 70 mph while going up a steep incline. The vehicle's speed dropped from 70 to 15 mph within seconds. The consumer was unable to pull over because there was no shoulder. The consumer looks at the instrument panel and noticed that the dic was flashing reduce power. The consumer later found out that if the vehicle encounters a little emission problem it shuts down. The consumer's vehicle didn't have an emission problem but a computer glitch.

- Silverthorne, CO, USA

Axle/differential failure. Engaging reverse, vehicle will lunge forward with power and then jumps in reverse as if transmission is slipping or missing reverse gear. Vehicle strains to switch gears to reverse when vehicle is at a complete stop. Cstmer invoice: At time vehicle lunges and jumps in reverse. Reprogrammed PCM with update. Start vehicle idle 5 minutes or more, engaging D gear, engage A/C operation and then accelerating in 80-95 degree F enviromental conditions, vehicle will loose torque, rpms redline while appling normal accelrator pedal pressure. Vehicle stalls but never dies, coasted to nearby parking lot and called dealership for a wrecker, towed back to dealership for repairs. Dealer customer invoice: At times vehicle will not accelerate. Unable to verify customer concern. Operating as designed. No codes.

- Benton, AR, USA

2004 Chevrolet Colorado Z71 - randon stalling causing loss of steering and braking.

- Clinchco, VA, USA

Engine & cooling systems, check engine light stays on while vehicle in use.engine misses or vibrates slightly.valves springs are bad @ 15,000 miles.

- Baltimore, MD, USA