Problems · NHTSA complaints

1999 GMC Sonoma problems

Owners filed 72 complaints about the 1999 GMC Sonoma with NHTSA between Dec 1998 and Dec 2017. The most-cited component is service brakes, hydraulic (11).

Complaints
72
Filed with NHTSA
Crashes
7
Reported by owners
Fires
1
Reported by owners
Injuries
5
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Service brakes, hydraulic11
  2. Power train10
  3. Seats8
  4. Structure7
  5. Air bags6
  6. Engine and engine cooling6
  7. Electrical system4
  8. Fuel system, gasoline3
  9. Equipment3
  10. Vehicle speed control3
  11. Seat belts3
  12. Steering3
  13. Suspension3
  14. Service brakes2

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Oct 30, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
19981
199911
200011
20015
200212
20037
20046
20055
20065
20071
20080
20092
20100
20111
20120
20131
20140
20152
20160
20172

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Service brakes, hydraulic

11 reports2 crashes1 fire
“I WAS TRAVELING ON MY JOB. I WAS IN ATLANTA GA. AND IT WAS RAINING. TRAFFIC SLOWED DOWN AND I LIGHTLY APPLIED MY BRAKES AND THEY LOCKED DOWN CAUSING THE YUKON TO SLIDE. I ALMOST HIT THE VEHICLE IN FRONT OF ME. THIS HAS HAPPENED 5 TIMES AND IT WAS RAINING EVERYTIME. THE RECALL SAID IT WAS ONLY FOR UP NORTH. I TRAVEL NORTH ALL THE TIME ON MY JOB. BUT I LIVE IN ALABAMA. SO I THINK THE RECALL SHOULD COVER MY 99 GMC YUKON ALSO.*JB”
Owner complaint to NHTSAFiled Sep 5, 2005Service brakes, hydraulicODI 10135338

Power train

10 reports
“1999 GMC SONOMA EXPERIENCED PROBLEMS WITH TRANSMISSION, CD PLAYER, TIRES AND HEATING COIL.*MR CONSUMER CONCERNED THAT DEALER DID NOT TELL THEM THAT THERE WAS A RECALL ON THIS VEHICLE. THE TRANSMISSION WAS REPLACED, EXCHANGED REBUILT TORQUE CONVERTER WITH TRANCES FILLER 12 MONTH OR 12,000 MILE WARRANTY. *BF *NM”
Owner complaint to NHTSAFiled Apr 12, 2005Power train, Tires, Equipment, Unknown or otherODI 10118892

Seats

8 reports
“THE DRIVER'S SEAT ADJUST FAILED. NO PRESSURE--COULD BE PUT ON THE SEAT WITHOUT IT MOVING TO THE FULL BACK POSITION. THE DEALER INITIALLY REPLACED THIS IN MAR 05 AFTER ME AND DEALER SPEAKING WITH GMC CUSTOMER SATISFACTION. GMC REIMBURSED ME FOR COSTS. 15 MONTHS [!!] LATER, IT FAILED AGAIN. THE DEALER HAD ONLY SEEN THIS ISSUE TWICE, BOTH TIMES WITH MY CAR. GMC INITIALLY DECLINED TO PAY FOR THE REPAIR. THEN, AFTER DISCUSSION WITH ME, THEY OFFERED TO PAY FOR IT WITH ME UNDERSTANDING THAT THEY HAD NO LIABILITY AND WOULD NOT PAY FOR ANY FUTURE REPAIRS OR WOULD OFFER ME $500 CERTIFICATE DISCOUNT ON A NEW GMC TRUCK. WHEN I MENTIONED THE SAFETY ISSUE POTENTIAL, THEY WANTED ME TO UNDERSTAND THAT IF I ACCEPTED THE MONEY, I WOULD HAVE NO STANDING IN FUTURE PROBLEMS OF THE SAME NATURE. I DECLINE. I AM CONCERNED ABOUT THE SAFETY POTENTIAL OF THIS. THEY HAVE TWICE CORRECTED THE SYMPTOMS. IS THERE AN UNDERLYING CAUSE??? ARE OTHERS HAVING SIMILAR ISSUES. I HOPE YOU CAN HELP TO GET A HANDLE ON THIS FOR ME AND, POTENTIALLY, FOR OTHERS, TOO. THANK YOU. *JB”
Owner complaint to NHTSAFiled Aug 9, 2006SeatsODI 10165075

Structure

7 reports
“WHILE STEPPING OFF OF TAILGATE, BOTH CABLES SNAPPED AND THE TAILGATE FELL OFF OF PICKUP. NO BROKEN BONES, BUT BUMPS AND SCRAPES. CABLES ARE SEALED, EXCEPT FOR THE ENDS, WHERE WATER MUST HAVE GOTTEN INTO THEM AND CORRODED THE CABLE FROM THE INSIDE. *TR”
Owner complaint to NHTSAFiled Nov 4, 2009StructureODI 10291011

Air bags

6 reports5 crashes
“TL* THE CONTACT OWNED A 1999 GMC SONOMA. WHILE DRIVING 5 MPH ON A FLOODED DIRT ROAD, THE CONTACT CRASHED INTO A DITCH. AFTER THE CRASH, THE VEHICLE CAME TO A COMPLETE STOP. THE AIR BAG DEPLOYMENT WAS DELAYED. THE CONTACT SUSTAINED A CRACKED PELVIS, BROKEN FACIAL BONES, OPTIC NERVE DAMAGE, AND OTHER SEVERE INJURIES TO THE FACE. MEDICAL ATTENTION WAS REQUIRED. A POLICE REPORT WAS NOT FILED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE VIN WAS NOT INCLUDED IN ANY RECALLS. THE VEHICLE WAS DESTROYED AND TOWED. THE LOCAL DEALER WAS NOT CONTACTED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 140,000. *TT THE CONSUMER STATED BACK WINDSHIELD EXPLODED AND FRAME WAS BENT. *TR”
Owner complaint to NHTSAFiled Dec 28, 2017Air bagsCrash reportedODI 11057130

Engine and engine cooling

6 reports1 fire
“I HAVE ENCOUNTERED SEVERAL DIFFERENT CHEVY/GMC VEHICLES THAT ARE EXPERIENCING A LAGGING START AND IN SOME CASES NO START WITHOUT A BOOST. MY SONOMA HAS THE LAG AND I HAVE A FEW FRIENDS THAT HAVE BLAZERS AND FULL SIZE TRUCKS AS WELL. THE VARIATION OF ENGINE SIZES THAT ARE AFFECTED HAS ME PERPLEXED. I HAVE ATTEMPTED TO RUN CODES WITH NO FAULT RESULTS. THIS OCCURS EVERY TIME I ATTEMPT A STARTUP. *TR”
Owner complaint to NHTSAFiled Jan 5, 2009Engine and engine coolingODI 10253811
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 30, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.