Four problems related to tail light switch have been reported for the 2003 GMC Envoy. The most recently reported issues are listed below.
When trailer is connected to the 7 way to box trailer connection trailer tail lamps do not light correctly. Brake and left turn signal lamps work properly. The right turn trailer lamp is partially lit when turn signal is not engaged. When right turn signal is engaged the left and right turn signals start flashing, brake lights work normal. This turn signal issue apply only when trailer electric circuit is plunged in to the trailer circuit. My understanding there was a recall regarding the flasher unit for the 2003 Envoy vehicle turn signals. It appears the trailer circuit has a similar issue. Both the vehicle and trailer work off the same flasher module. See recall 05v198000. I plan to replace the flasher unit to correct this defect. If you never towed a trailer this issue would not be discovered. When towing a trailer driver could become confused when your making a right turn. This potentially could result in an accident. The trailer used was a 5x10 foot single axle box trailer with four wire electrical circuit. I had no issues when towed with a different make of truck. I did replaced both trailer tail light assembly and issue did not change.
Tl- the contact contact owns a 2003 GMC Envoy. The contact stated that the brake lights stop working on the vehicle. The vehicle was taken to the dealer and it was determined that the tail light stop lamp assembly needed to be replaced, however, the vehicle was not included in NHTSA recall 04v527 (exterior lighting). The vehicle had not been repaired. The current mileage was 120000. Rl.
Consumer complained about tail lights malfunctioning. Also, while driving, consumer could hear the air coming inside the vehicle. In other words, the vehicle was not air tight.
2003 GMC Envoy with a list of problems ** the consumer began to hear a knocking and pinging in the engine on cold starts and felt a hesitation when the automatic transmission shifted into gear. After many complaints, it was finally discovered the engine knock was due to shorter pistons in the re-designed engine and the hesitation in the transmission shifting required reprogramming. The consumer was told he would have to live with the engine knock, because it could be more trouble taking the engine apart. On a separate occasion, the engine stalled due to the battery dying. From April 2004 to October 2004 the battery failed several times and had to be re-charged. During that same time the engine light illuminated and each time it happened, the dealer would have to reprogram the engine computer. The radio was not functioning properly which primarily consisted of static. The driver information center control knobs as well as the radio knobs wore out. The front center console was loose. It was discovered that the engine light was coming on because the third stop light that's on the top of the liftgate malfunctioned. There was a short circuit in the stop light. The cooling fan broke, the brakes and the left front head lamp had to be replaced. The rear tail lights, directional and signal lights have been replaced several times. The lug nut broke while a replacement tire was being mounted on the vehicle. The front stabilizer linkage was replaced. The gas tank had to be replaced along with the fuel lines and a seal on the tank due to a leak. The seat belt was designed poorly and the belt cuts into the consumers neck. The drivers side door didn't close properly, the windshield wipers were replaced within the first 2 years.