2018 Volkswagen Tiguan electrical system problems

“Within 6 months of purchasing car CPO from dealer, car went into limp mode. Was less than 35k miles, still having same issues at 85k miles. Took to dealer, they said nothing was wrong with car. Car began to have ECU light come on frequently in the middle of driving, took back to dealer. They replaced the fuel injector harness under warranty. Began to have issues with fuel injector misfires, car stalling and lagging at stop signs, sputtering when given gas. When driven for long periods at a time, would intermittently not start. Took back to dealer within a year, spent 1800 on maybe fixes, modules and carbon filter replacement. Same issues. Took back again, spent another 1800 replacing modules. Same issues repeated. Took to a european car specialist as we were frustrated with not getting the vehicle properly fixed for years at the dealer, had the engine walnut blasted for any carbon buildup and fuel injectors cleaned, they diagnosed and said the fuel rail harness is bad. Took back to Volkswagen, they re-evaluated and said there was no issue- my husband had to explain to them that there was a repair just done so code reading would not be sufficient and they needed…”

“Suspected Electrical Defect and Potential Fire Hazard – 2018 Volkswagen Tiguan SEL I am reporting a suspected electrical safety defect involving the sunroof wiring harness in my 2018 Volkswagen Tiguan SEL. While my vehicle was parked, an attempt was made to replace a blown F23 fuse. Smoke began coming from the sunroof area and filled the cabin. Afterward, multiple warning lights illuminated, the vehicle displayed a “turn car off” warning, the door locks repeatedly cycled, the climate control stopped working, and the infotainment/navigation screen shut off and restarted. A mechanic subsequently determined that the sunroof wiring harness had melted and required replacement. I was informed that the wiring harness (part number 5NA971648C) is unavailable and has been placed under Volkswagen’s “quality inspection” process due to suspected fire-hazard concerns. Volkswagen reportedly no longer supplies this harness separately, requiring replacement of the entire sunroof assembly, including the glass, even though the glass is not the source of the problem. The repair is estimated at $3,900 and requires extensive labor, including dashboard removal and a VIN-specific part…”

“While opening the sunroof, the front end of the sunroof began to billow smoke. The cabin filled with smoke. The car was immediately turned off and the fuse was removed. While attempting to drive the vehicle closer to the dealership, the car experienced a total electrical failure and stalled on the side of the road. The car will require a tow. There is a known recall on this matter, however, my VIN does not fall under this recall. The recall explains the exact issue we experienced with the smoking sunroof motor from the faulty lighting causing a serious fire risk.”

“I purchased this 2018 Volkswagen Tiguan in September 2019 and began noticing an intermittent rearview-camera problem around that time. I do not remember the exact date of the first occurrence because the problem initially happened only occasionally and was not persistent. When the vehicle is placed in reverse, the rearview camera intermittently fails to provide a reliable image. At other times, it operates normally. Because the problem is intermittent, it has been difficult for the dealership to reproduce consistently. Loss of the camera image reduces visibility behind the vehicle and creates a safety concern while backing up. An authorized Volkswagen dealership inspected the vehicle. The service manager stated that the stored fault indicates an intermittent open circuit in the video cable. The dealer’s diagnostic history reportedly shows approximately 90 fault occurrences beginning July 19, 2026. During recent testing, the dealership was able to get the fault to set once. The dealership has not conclusively confirmed that the camera control module failed. It proposes replacing the module as the first repair step for approximately $1,165 and stated that…”

“2018 VW Tiguan. The fuel injector harness failed. There is a NHTSA letter stating 2018-2019 Tiguans had this issue and there’s an extended warranty up to 120,000 miles. My Tiguan is at 91,000 miles, but VW is saying the warranty isn’t assigned to my VIN. So there’s a warranty for this exact issue and year, but my vehicle isn’t covered. This warranty obviously needs to be extended by build date as it’s a pretty costly repair.”

“The contact owns a 2018 Volkswagen Tiguan. The contact stated that while driving at an undisclosed speed, the parking brake independently activated, and the air bag warning light illuminated. In addition, while attempting to turn off the vehicle, the key failed to function as intended. The vehicle was driven to the shoulder of the road and turned off. The contact stated that while attempting to start the vehicle, several unknown warning lights were illuminated. The parking brake was not activated. Additionally, the front driver's side door latch failed to unlatch as needed. The contact stated that none of the electrical system features functioned as intended. The vehicle was taken to the dealer, where it was diagnosed with a failed wiring harness and a failed front driver's side door harness. The contact was informed that the wiring harness and front driver's side door harness needed to be replaced. The vehicle was not repaired. The dealer reset the codes. The contact was informed that until the repair was performed, the failure would recur. The contact referenced an unknown recall with a similar failure; however, the VIN was not associated. The manufacturer…”