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ELECTRICAL
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2.7 DIAGNOSTIC TROUBLE CODES – EMS ECU
Sr. No
P Code
Description as per
ISO/SAE
Fault cause
Probable Trouble Area
1
U1009
Vehicle Communication
BUS OFF
Short Circuit to
Battery or Ground
1) Check short circuit between
CAN H and CAN L.
2) Check CAN H short to Ground.
3) Check CAN L Short to Battery.
2
U2009
Vehicle Communication
Bus Open Circuit
Open Circuit of
CANH or CANL
from ECU
Connector Side
1) Check open circuit of CANH or
CANL from ECU connector side.
3
U1155
Lost Communication
with IPC Message
Timeout Failure
If ECU does not
get Rx messages
from IPC for more
than 500 msec
1) Check open circuit failure at
IPC ECU connector.
2) Check whether IPC ECU is
powered or not.