PACCAR Fault Code P1658: PCI ECU – Internal Error

Code details

Manufacturer

PACCAR (Kenworth & Peterbilt)

Applies to

PACCAR MX-13 (2013–2016)

Fault code

P1658

J1939 SPN

629

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.

Related fault codes

• PACCAR Fault Code P060C — Internal ECU Injector Power Generation – Malfunction
• PACCAR Fault Code P1601 — PCI ECU – Internal Error
• PACCAR Fault Code P160A — PCI ECU – Internal Error
• PACCAR Fault Code P060A — PCI ECU – Internal Error
• PACCAR Fault Code P1602 — PCI ECU – Software Error
• PACCAR Fault Code P1674 — PCI ECU – Software Error
• PACCAR Fault Code P1675 — PCI ECU – Software Error
• PACCAR Fault Code P1676 — PCI ECU – Software Error