2017 Chevrolet Silverado 2500 Problems

What owners report

Owners of this model year most often describe electrical warnings, mainly trailer brake alerts and diesel emissions sensor codes, and many of those complaints were filed in 2024. Transmission shifting problems, block heater cord fires, and long waits for block heater recall parts also come up. Where mileage is recorded for the transmission and block heater complaints, it falls between about 9,000 and 28,000 miles, while many other complaints give no mileage.

1. 1
   Brakes

   Trailer brake warnings and controller faults

   • 7 complaints (13%)
   • typically at 7.7 yrs old
   • filed 2021–2024

   Owners describe a service trailer brake or trailer brake controller warning that flashes or sounds repeatedly and does not clear, often while towing. Some say the constant alerts made the message screen hard to use, and an owner says the trailer brakes seemed to stop working on a long tow. Other complaints tie the warning to chafed wiring that shorts against the frame or bumper, with stored codes appearing alongside it. According to a complaint, a technician linked a similar alert to low battery voltage. No mileage is given in these complaints, and the warning is described as appearing while towing or when the truck is started.

   What to check: Ask whether the trailer brake controller wiring and its ground connections were inspected, and whether any codes are stored. On a test tow, confirm that the trailer brake warning does not appear and that the controller responds normally.

   2 excerpts from owner complaints in NHTSA records

   “Another day another code. P11DB (NOX upstream). Now I am at NOX downstream, NOX upstream, DEF pump, cylinder 7 wire connector, Trailer Brake Controller wire harness, temperature sensor, and a dozen chafing wire harnesses because they are pulled to tight, have extreme bends in them or are rubbing against the frame, bumper, etc. Chevy recommended that I replace the cylinder 7 injector which was not the issue. …”

   NHTSA complaint #11596526, filed 2024-06

   “I was on a 2 hour drive hauling my 8000lbs trailer when the service trailer brake alarm went off. It constantly dinged the whole 2 hour trip and caused my trailer brakes not to work putting me and my family in danger hauling such a load with no brakes. Not only do I have no brakes but the truck is deemed undrivable due to the constant distractions of the dinging. It also inoperates the message screen to see my speed or to use any other functions like voice commands and radio. …”

   NHTSA complaint #11453146, filed 2022-02
2. 2
   Electrical system

   Diesel emissions sensor codes and reduced speed

   Mentioned in 5 of 51 sampled complaints

   Owners report fault codes in the diesel emissions system, including reductant (DEF) level and NOx sensor codes, along with a warning that limits vehicle speed. Some say replacing a NOx sensor cleared the warning after earlier sensor replacements did not, while others report codes returning or new sensor codes appearing. According to a complaint, service staff recommended replacing a cylinder 7 injector, which the owner says was not the problem. No mileage is given in these complaints, and the speed limiting is described as happening in subzero temperatures in a remote area.

   What to check: Ask for the history of any NOx or DEF sensor replacements, and check for stored emissions codes with a scan tool before buying. Ask whether the wiring near cylinder 7 was inspected when the emissions codes appeared.

   2 excerpts from owner complaints in NHTSA records

   “2017 CHEVY SILVERADO 2500HD LT 6.6L It all started on June 15, 2024 with a TRAILER BRAKE CONTROLLER (chafing wire that was grounding and shorting against the frame and bumper) resulted in a barrage of issues. Our truck being down over a month and throwing (so far) 16 codes just on the first 2 scanners. It has also taken out the TPMS too. …”

   NHTSA complaint #11599344, filed 2024-07

   “When transiting between airport and home in very remote area in subzero temps the DEF warning system suddenly came on limiting vehicle speed progressively. No services were available both at this time of day and in this very remote area. There needs to be some way to override this system in the case of potential life and death. There were no warnings that this system was going to activate, it simply came on. The system had plenty of fluid but it appears the DEF heater failed. A vehicle should have an override for life and safety matters. …”

   NHTSA complaint #11495697, filed 2022-12
3. 3
   Transmission and drivetrain

   Transmission harsh or delayed shifting

   • 5 complaints (9%)
   • median 10,700 mi at 3.1 yrs old (3 state mileage, few)
   • filed 2017–2023

   Owners describe hard or clunking shifts and a brief delay before the truck lunges forward, often when slowing at yield signs or pulling away. Other complaints describe the transmission not shifting correctly at moderate speed, and another reports a check engine light with transmission codes, where the truck would not shift until the throttle was released. An owner says the dealer acknowledged the shifting problem but had no solution at the time. Another says the transmission failed again after an earlier repair. Where mileage is recorded, these complaints fall between about 9,000 and 28,000 miles, and the shifting is often reported at low speed while slowing or starting from a stop.

   1 related service bulletin

   What to check: Ask whether the shift and throttle delay service bulletin was reviewed, since it describes that delay as a normal condition when the throttle is opened rapidly. On a test drive, check for hard or delayed shifts when slowing and pulling away from a stop.

   2 excerpts from owner complaints in NHTSA records

   “Ii took my 2017 1500 silverado I purchased 11/2020 that had about 9500 miles to the chevy service center and stated while driving my vehicle when coming to a stop during the 2-1 downshifting of the transmission a very loud clunking noise and at the same time it feels like something hit the rear of the vehicle. Upon starting from a stop sign or stop light the 1-2 shifting of the transmission makes the same loud clucking noise and it feels like something hit the vehicle was in the rear again. …”

   NHTSA complaint #11355687, filed 2020-09, 9,000 miles

   “Transmission shifts extremely hard causing a loud clunk and the vehicle to lunge forward. This is experienced a lot during slowing down at yield signs or when starting out in traffic. The truck experience a split second delay in acceleration and then suddenly shifts very hard lunging forward. …”

   NHTSA complaint #11022161, filed 2017-09, 10,700 miles
4. 4
   Equipment

   Block heater recall repair parts unavailable

   • 6 complaints (11%)
   • median 32,499 mi at 3.7 yrs old (2 state mileage, few)
   • filed 2020–2022

   Owners say they received recall notices for the engine-block heater cord, but the dealer told them the repair part was not yet available. Some say a recall lookup tool also showed the part as unavailable, and some had not had a failure while they waited. Complainants feel the wait has been longer than a reasonable time, and another says the owner was told in January 2020 that parts were on back order. The only recorded mileage in this group is about 35,400 miles, in a complaint about a recall notice first received in January 2020.

   Recall 21V496000Recall 19V328000

   What to check: Ask the seller for proof that the block heater cord recall repair was completed, and check the truck's recall status with NHTSA's recall lookup. If a repair is still open, ask the dealer when the part is expected and whether it is in stock.

   2 excerpts from owner complaints in NHTSA records

   “The contact owns a 2017 Chevrolet Silverado 2500. The contact received notification of NHTSA Campaign Number: 21V496000 (Equipment) however, the part to do the recall repair was unavailable. The local dealer was contacted, and it was confirmed that the part was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced the failure. VIN tool confirms parts not available.”

   NHTSA complaint #11447041, filed 2022-01

   “The contact owns a 2017 Chevrolet Silverado 2500. The contact received notification of NHTSA campaign number: 21V496000 (Equipment) however, the part to do the recall repair was unavailable. The vehicle was taken to the local dealer who stated that the part was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not notified of the issue. The contact had not experienced a failure. Vin tool confirms parts are not available.”

   NHTSA complaint #11431098, filed 2021-08
5. 5
   Engine

   Engine-block heater cord shorts and fires

   • 7 complaints (13%)
   • median 20,000 mi at 2.3 yrs old (5 state mileage, few)
   • 4 mention a crash, fire or injury
   • filed 2019–2024

   Owners describe engine-block heater cords or terminals shorting, with fires starting in the engine area and in some cases the truck being destroyed. Often the truck was plugged in when the fire started, and an alarm or a noise woke the owner. Some owners say they had not received a recall notice until after the fire, or had not received one at all. Reported at about 9,000 to 21,000 miles, mostly during winter while the block heater was plugged in.

   Recall 19V328000Recall 21V496000

   What to check: Ask whether the block heater cord recall repair has been completed, and check the truck's recall status with NHTSA's recall lookup. Before using a block heater, check the cord and plug for heat damage or melting, and avoid using an extension cord with it.

   2 excerpts from owner complaints in NHTSA records

   “Feb 5th 2019 my truck was parked in my driveway and the blockheater eas plugged into my electrical outlet on my garage and at 1:00 a.m. I was awakened to a loud explosion. When I finally figured out the cause my truck and garage were on fire. 3 months later found out GM had recalled almost 400,000 trucks my same year, make and model due to engineblock heater cords shorting out apparently. I have yet to receive a notice on my truck. The accident was a total loss and there was damage done to my garage. …”

   NHTSA complaint #11210667, filed 2019-05, 20,000 miles

   “Owner of both a 2017 duramax and a tahoe from new. Duramax had just turned 21,000 miles this winter. Returned from fishing sunday night and plugged the truck into a heavy guage extension cord. My family and I were woken at 3am early january to a vehicle alarm. Turns out the truck had started fire. Luckly the alarm was audible long enough to wake us. By the time I had reached the keys, it had stopped. A peek out the window showed a culprit I hadn't anticipated. Inspectors found the source in the location of the block heater. …”

   NHTSA complaint #11182573, filed 2019-02, 21,000 miles

Buying note. Ask for proof that the block heater cord recall repair was completed and check the truck for open recalls before buying. On a test drive, check the trailer brake warning and shifting behavior, and ask for any stored electrical or emissions codes.

Summary written with AI from a sample of 51 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.