Ford Ranger CAN Faults
Some 2021 Ford Ranger vehicles equipped with 4WD and built April 6, 2021 through July 26, 2021 may experience a controller area network (CAN) communication issue that will set one or more CAN DTCs. This may be due to an internal hardware fault within the all terrain control module (ATCM) mode select switch (MSS).
A communication DTC (U-code) may be set in the ATCM, steering column control module (SCCM), image processing module-A (IPM-A), power steering control module (PSCM), restraints control module (RCM), anti-lock brake system module, occupant classification system (OCS) and/or heads-up display (HUD) modules.
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Disconnect the 12V battery.
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Access and disconnect the gateway module connector C2431 and measure resistance across pins 17 and 18 (harness side). If the measured resistance is not greater than 100 ohms, access and disconnect the ATCM/MSS connector C3393.
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Access the gateway module connector C2431 and again measure resistance across pins 17 and 18. If measured resistance is greater than 100 ohms, replace the ATCM/MSS module.