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code 84
have a 99 gmc flatbed. Showing a code 84 and going into limp mode when in 6 gear accelerating at higher engine rpms, light comes on, let off the throttle light goes off. The speedo is registering correct speed, scan tool in showing 0 mph. Have checked both lea... Login to read more. ![]()
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| VIN | 1GDJ6H1C1X |
| Engine | 7.2 L |
Vehicle Data
1999 GMC C6500 Topkick C6H042 7.2L
| VIN | 1GDJ6H1C1X |
| Engine | 7.2 L |
