CAN Link PCM Circuit Network Fault
Findings, check these first
- Open or shorted CAN bus wiring
- Failed module dragging the bus down
- Corroded network connector
- Aftermarket device on the CAN bus
- PCM network interface fault
Standard procedure
- Remove aftermarket CAN devices
- Scan all modules for the silent one
- Measure CAN voltages and resistance
- Isolate modules to find the fault
- Repair wiring or replace the module
Code lookup
Type a code above, or start from a symptom or a common code.
Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.
Sources and review
Review: checked against the recorded source material.
- OBDII.pro: P1656 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1656: CAN Link PCM - PCM Circuit - Network
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.
- P1656 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes
live reference page (obd2-codes.co)
Supports: Ford meaning for P1656: CAN Link PCM Circuit Network
Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.
Last updated 2026-09-06.
Report a correction for P1656. Include your vehicle, the issue and a source if you have one.