Chevrolet Low Cab Forward 6.7L Diesel Engine 6500XD (GMNA-Localizing-
U.S.-15749874) - 2022 - CRC - 12/1/21
124
Driving and Operating
Symptom
Cause
Corrective Action
Reference
Black exhaust smoke
Engine Control system faulty
4
-
Air cleaner clogged
4
-
Fuel system faulty
4
-
Exhaust system clogged
4
-
Diesel particulate filter (DPF)
faulty
4
-
Engine is overheating
No engine coolant
Add engine coolant
See
Front of radiator is clogged
with dirt
Wash clean with tap water
See
Sub tank pressure cap not
sufficiently tightened
Make sure it is firmly
tightened or replace the sub
tank pressure cap
-
Fan belt loose
Adjust the tension or replace
the belt
See
Engine coolant dirty
4
-
Fan clutch faulty
4
-
Sub tank pressure cap dirty or
faulty
Clean or replace
-