This list may help explain a bit more:
Diagnostic Trouble Code (DTC)
Powertrain Codes
P0xxx Generic (SAE)
P01xx measurement of air and fuel
P02xx measurement of air and fuel
P03xx ignition system
P04xx additional emission control
P05xx speed and idle regulation
P06xx computer and output signals
P07xx transmission
P08xx transmission
P09xx control modules, input and output signals
P1xxx Manufacturer Specific
P2xxx Generic (SAE)
P30xx - P33xx Manufacturer Specific
P34xx - P39xx Generic (SAE)
Chassis Codes
C0xxx Generic (SAE)
C1xxx Manufacturer Specific
C2xxx Manufacturer Specific
C3xxx Generic (SAE)
Body Codes
B0xxx Generic (SAE)
B1xxx Manufacturer Specific
B2xxx Manufacturer Specific
B3xxx Generic (SAE)
Network Communication Codes
U0xxx Generic (SAE)
U1xxx Manufacturer Specific
U2xxx Manufacturer Specific
U3xxx Generic (SAE)
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