2015 Chevrolet Tahoe: engine knocking or ticking

Filed Mar 19, 2026 · Fuel system · AL

The failure is believed to have originated in the fuel delivery system, specifically the check valve in the low-pressure fuel feed jumper line at the engine. This valve failed to seat properly, allowing high-pressure pulses to travel back into the low-pressure side of the system. This malfunction caused the S-shaped portion of the fuel feed line near the tank to vibrate excessively against its mounting clip. This constant friction wore through the line, resulting in an active fuel leak. All damaged components remain on the vehicle and are available for inspection upon request. The safety of the driver, passengers, and the public is at immediate risk due to a severe fire hazard. Because the leak is located near the fuel tank and undercarriage, gasoline is being released where it could be ignited by road sparks, static electricity, or exhaust heat. A fuel leak of this nature threatens a catastrophic fire that could result in vehicle loss or personal injury. The problem has been confirmed via a physical inspection that matches the symptoms documented in a GM Service Bulletin (Recall - High Pressure Fuel Pump Leakage). While the vehicle has not yet been subjected to a formal tear-down by a dealer due to the danger of driving it with a leak, the visual evidence at the exact location specified in manufacturer documentation confirms the failure. To date, the vehicle has not been inspected by the manufacturer, police, or insurance representatives. Prior to the leak, the primary symptoms were an audible rattling and ticking noise from the engine bay and underside, characteristic of the pressure pulses described in the TSB. There were no warning lamps or dashboard messages, as the mechanical wear on the exterior of the fuel line occurred outside the scope of the vehicle’s onboard diagnostic sensors.

Filed Apr 25, 2023 · Fuel system · CA

2015chevy Tahoe LT fuel pump rattle cause fuel line to rattle. Service Bulletin Bulletin No.: 17-NA-304 Date: February, 2020 Subject: Brand: Cadillac Chevrolet TECHNICAL Ticking, Rattle and/or Buzzing Noise Heard from inside Passenger Compartment, Possible Fuel Leak Model: Escalade Escalade ESV Model Year: from VIN: Engine: L86 L86 L83 L83 L83, L86 L83, L86 Transmission: to from to Suburban Tahoe 2015 Yukon Models Yukon XL Models 2020 GMC Involved Region or Country North America, Middle East, Europe, Russia, Chile, Columbia, Ecuador and Peru. Condition 1 Some customers may comment on the following condition: • Arattlingand/ortickingnoisethatmaybelouderinsidethevehiclethanoutside. ⇒ The noise may be picked up at the back of the left valve cover, and/or underneath the vehicle near middle of the driver’s door. ⇒ This noise will be noticeable at idle, most noticeable in the 700-900 RPM range. ⇒ The noise may also sound like a lifter tick. ⇒ This may also be called a fuel line buzz or ringing noise. • Whiletherattleisoccurring,theS-shapeportionofthefuelfeedline,rightinfrontof the tank, will be vibrating / rattling. Condition 2 Some customers may comment on a fuel leak. Diagnosis that the fuel leak is originating from the fuel feed line at the molded-in clip on top of tank. Cause The rattling, ticking noise may be caused by the check valve in the low pressure fuel feed jumper line at the engine not fully seating, allowing pressure pulses from the high pressure side back into the low pressure side of the fuel system. These pressure pulses could cause the S-shaped portion of the fuel feed line, in front of the tank, to vibrate and/or rattle If the S-shaped portion of the fuel line rattles over a period of time, the fore-aft motion in the line could result in wear. This wear could result in a fuel leak where the line is secured into the molded-in clip on the tank.

Filed Oct 5, 2021 · Engine · KY

I was driving at 55 mph when the entire car shuddered and very loud babgihg and knocking occurred. Immediately the car slowed way down and lost power. Luckily I was able to sagely move it out of the lane before getting rear ended but that was only because I was in the right lane. The check engine light came on and started blinking and the traction control failure and safety radar system failure light came on. The vehicle was towed to a Chevy dealer and found out the lifters had failed and these damaged the crankshaft. The truck has 91000 miles. After researching there seems to be a very large problem with these engines failing due to the AFM system that chevy uses

Filed Mar 8, 2021 · Acceleration, Brakes · 55,600 miles · TN

At slow rate of speed, pulling into parking spot or in drive-thru lines, the brake pedal takes effort to push, ticking, clicking and grinding sound and the brake pedal begins to vibrate and very hard to push down to stop the vehicle. I see this has been recalled on other vehicles but not my particular tahoe ltz VIN# this has been an ongoing issue since september 2019 after the car was purchased.

Filed Jun 13, 2016 · Airbags, Electrical · 25,000 miles · MO

While driving the vehicle's driver seat will move forwards and backwards making it unable to reach pedals to stop safely, air bag light will flash erratically, loud ticking noise, miss-fire/vibration while idling. Been to the dealership twice to fix still not fixed, contacted gm about issues and to file a complaint. Now dealership refuses to work on tahoe