PACCAR (Kenworth & Peterbilt)
PACCAR fault code
SPN 168 / FMI 1
PACCAR Fault Code P1563: PCI ECU Power Supply – Data Valid But Too Low, Most Severe
P1563 on PACCAR (Kenworth & Peterbilt) engines means: PCI ECU Power Supply – Data Valid But Too Low, Most Severe. The failure mode (FMI 1) is “data valid but below normal operating range (most severe)”.
Code details
- Manufacturer
- PACCAR (Kenworth & Peterbilt)
- Applies to
- PACCAR MX-13 (2017–2020)
- Fault code
- P1563
- J1939 SPN
- 168
- FMI
- 1 — Data valid but below normal operating range (most severe)
- Truck models in source
- Kenworth T680, T880, W900, T800; Peterbilt 579, 389, 567, 367
What to do next
- Read active and inactive codes with the OEM service tool and note the occurrence count.
- FMI 1 tells the shop the type of failure to test for: data valid but below normal operating range (most severe).
- Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.
Get this code diagnosed
Send one request and nearby diesel shops and mobile mechanics can quote the repair.
Owner-OperatorAdd this truck & start trial
Run your own truck?
Log maintenance, track fault codes, and get roadside breakdown dispatch.
$39.99/mo
Cancel anytime
More ways Repairius keeps vehicles running
Tools for owner-operators, shops, fleets and drivers — all in one place.
Auto & Truck Shop OS
From $99.99/mo- Work orders & job management
- Digital vehicle inspections
- Parts lookup & inventory
- Estimates, invoices & payments
Fleet Maintenance
From $129/mo- Preventive maintenance schedules
- Driver DVIRs & defect reports
- Safety & compliance clearance
- Preferred shop dispatch & approvals
My Garage
100% free- Digital glovebox for your vehicles
- Maintenance history & reminders
- Recall alerts
- Book verified local shops
Owner-Operator? Track this truck for $39.99/mo
StartFix these trucks? Get your shop listed free·Find a diesel shop
Related fault codes
- PACCAR Fault Code P0562 — PCI ECU Power Supply – Data Valid But Too Low on ECU (D420) Pin (B60) or Pin (B61) or Pin (B62)
- PACCAR Fault Code P0563 — PCI ECU Power Supply – Data Valid But Too High on ECU (D420) Pin (B60) or Pin (B61) or Pin (B62)
- PACCAR Fault Code P0A1F — PCI ECU Power Supply – Data Valid But Too Low
- PACCAR Fault Code P3003 — PCI ECU Power Supply – Data Valid But Too Low
- PACCAR Fault Code U1722 — CAN Communication – Message (VEP1) Data Error, Power Supply Value From Aftertreatment System
- PACCAR Fault Code P0562 — PCI ECU Power Supply – Data Valid But Too Low on ECU (D420) Pin (B61) or Pin (B62)
- Cummins Fault Code 441 — Battery #1 Voltage Low - Warning
- Cummins Fault Code 441 — Battery #1 Voltage Low - Warning
Source: PACCAR MX-13 2017–2020 fault code list (Diesel Laptops). See also OBD-II codes.