U0155 — Lost Communication with Instrument Cluster
What it means: Lost Communication with Instrument Cluster.
How serious / can you keep driving: Caution. Limp to the next safe stop.
Check first: Check IPC power and CAN connections
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Salt Lake City, UT
Closest first. Tell them U0155 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Salt Lake City, UT · (801) 531-9256
- 0.0 mi away — based in Salt Lake City, UT · (385) 503-8084
- 0.0 mi away — based in Salt Lake City, UT · (385) 386-4700
Seen on: Heavy Truck
What U0155 means
Lost Communication with Instrument Cluster. Common causes: IPC not responding on CAN.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- IPC not responding on CAN
- IPC power/ground
- CAN fault
First moves (roadside)
- Check IPC power and CAN connections
- inspect instrument cluster connector
FAQ
Lost Communication with Instrument Cluster. Common causes: IPC not responding on CAN.
Caution — Limp to the next safe stop.
The most common cause is: IPC not responding on CAN. Other possibilities include IPC power/ground; CAN fault.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside U0155, or share the same subsystem.
- ECU Power Supply — Intermittent / Erratic (SPN 627 FMI 2)
- Battery / Charging Voltage — Low (SPN 168 FMI 18)
- Engine Controller (ECM) — Internal Fault (SPN 629 FMI 12)
- Battery voltage low during crank (SPN 168 FMI 17)
- J1939 proprietary datalink lost (SPN 625 FMI 9)
- J1939 Data Link — Communication Error (SPN 639 FMI 2)
- High Speed CAN Bus Fault (U0001)
- Lost Communication with ECM/PCM (U0100)
Same symptom: Lost communication
Other datalink faults. A U-code is a network problem and is diagnosed at the datalink, not at the module that went quiet.
- Lost Communication with Fuel Injector Control Module (U0105) · Electrical, Charging & Network
- Lost Communication with TCM (U0101) · Electrical, Charging & Network
- Lost Communication with Gear Shift Module (U0103) · Electrical, Charging & Network
- Lost comms with ABS (U0121) · Electrical, Charging & Network
- Lost Communication with Body Control Module (U0140) · Electrical, Charging & Network
- Invalid Data from ECM (U0401) · Electrical, Charging & Network
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.