Complaints by model year
Each bar is one model year. The most recent years are still collecting complaints.
NHTSA ODI complaints (public domain) · updated 23 Oct 2026
Year by year
| Model year | Complaints | Recalls |
|---|---|---|
| 2001 | 0 | 3 |
| 2000 | 14 | 3 |
| 1999 | 4 | 3 |
| 1998 | 0 | 2 |
| 1997 | 0 | 2 |
| 1995 | 1 | 1 |
| 1994 | 0 | 1 |
| 1993 | 1 | 2 |
| 1992 | 0 | 2 |
| 1991 | 1 | 2 |
A model year gets its own page when it has enough data for at least three sections
Most common problems
- Service brakes, air16
- Unknown or other2
- Power train2
- Service brakes, hydraulic1
- Parking brake1
- Engine and engine cooling1
NHTSA ODI complaints, all model years
Recalls
8 campaigns cover the 4900.
ON CERTAIN SCHOOL BUSES AND TRUCK MODEL VEHICLES MANUFACTURED BETWEEN FEBRUARY 28, 1999, THROUGH APRIL 5, 2004, THE ANTI-LOCK BRAKE SYSTEM ELECTRONIC CONTROL UNIT (ECU) MAY MISINTERPRET A CORRUPT WHEEL SPEED SIGNAL.
ON CERTAIN HEAVY DUTY TRUCKS, A BRASS FITTING CONNECTS THE DOUBLE CHECK VALVE TO THE BRAKE RELAY VALVE. WITH CERTAIN INPUTS TO THE VEHICLE, THE WEIGHT OF THE CHECK VALVE ON THE FITTING CAN CAUSE THE ASSEMBLY TO RESONATE. THE SUBJECT VIBRATION CAN CAUSE EXCESSIVE STRAIN LEVELS IN THE FITTING, WHICH COULD EVENTUALLY FATIGUE AND FAIL.
ON CERTAIN MEDIUM AND HEAVY DUTY TRUCKS, A BRASS FITTING CONNECTS THE DOUBLE CHECK VALVE TO THE BRAKE RELAY VALVE. WITH CERTAIN INPUTS TO THE VEHICLE, THE WEIGHT OF THE CHECK VALVE ON THE FITTING CAN CAUSE THE ASSEMBLY TO RESONATE. THE SUBJECT VIBRATION CAN CAUSE EXCESSIVE STRAIN LEVELS IN THE FITTING, WHICH COULD EVENTUALLY FATIGUE AND FAIL.
VEHICLE DESCRIPTION: SCHOOL BUSES AND HEAVY DUTY TRUCKS EQUIPPED WITH REAR AXLE ASSEMBLIES PRODUCED BY DANA SPICER. CERTAIN REAR AXLE ASSEMBLIES WERE IMPROPERLY HEAT TREATED WHICH COULD ALLOW PINION BREAKAGE AT THE PINION THREADS.
THE DRIVE AXLE HOUSINGS CONSIST OF A PLATE STEEL CENTER SECTION AND TWO FORGED SPINDLES, ONE OF WHICH IS WELDED TO EACH END OF THE CENTER SECTION. EACH SPINDLE CONTAINS A KEYWAY SLOT IN WHICH THE LOCKING TAB FOR THE WHEEL BEARING NUT LOCKING MECHANISM IS INSERTED. THE LENGTH OF THE KEYWAY SLOT MAY NOT BE LONG ENOUGH TO ACCOMMODATE THE TAB CAUSING THE TAB TO BE DEFORMED OR DAMAGED DURING INSTALLATION.
FOUR COMPRESSION BACKPLATE RETAINING FASTENERS ON THE TURBO-CHARGER WERE TORQUED ONLY HAND TIGHT. THIS ALLOWS THE FASTENERS TO LOOSEN, AND CAUSES OIL TO LEAK INTO THE COMPRESSOR AIR SIDE OF THE TURBO-CHARGER WHICH, WHEN COUPLED WITH THE HEAT PRECIPITATED BY THE COMPRESSOR AND THE MIXING ACTION OF THE COMPRESSOR WHEEL, CAN RESULT IN AN AIR/OIL MIXTURE THAT FUELS THE ENGINE.
THE PRESSURE RELIEF VALVE WAS OMITTED IN THE AIR TANK. THE AIR TANK IS THE RESERVOIR FOR THE AIR SUSPENSION AND IS NOT BRAKE RELATED. WITHOUT THE PRESSURE RELIEF VALVE, THERE IS NO BACK-UP SYSTEM TO LIMIT AIR PRESSURE IN THE AIR SUSPENSION SYSTEM.
THE TIE ROD USED ON THE DANA FA-64 FRONT DRIVE AXLE HAS A THREADED SLEEVE TO PERMIT TOE-IN ADJUSTMENT WITHOUT REMOVING AN END. THE TIE ROD BAR IS NECKED DOWN TO INCORPORATE THE SLEEVE. A STRESS RISER IS CREATED AT THE THREADED PORTION OF THE ADJUSTMENT SLEEVE WHICH MAY CAUSE A FATIGUE FRACTURE AND FAILURE OF THE TIE ROD WHERE IT SCREWS INTO THE SLEEVE.
NHTSA recalls