A 2021 Ford Ranger came into a UK workshop showing two TPMS codes: B124D and B1182. When you see a general signal failure alongside a total system communication loss, the instinct is often to blame the sensors themselves. But the codes tell a different story when you look at the system as a whole.
The Configuration Trap
The diagnostic platform we build ranked a TPMS configuration error or an incomplete setup at 90% likelihood. The B1182 code, in Ford diagnostics, is often associated with a configuration error or an internal module fault related to the TPMS setup. It is entirely possible the Body Control Module has not properly learned the tire sensor positions, or the TPMS ‘Shipping Mode’ was not fully deactivated, leading to a system-wide communication failure. This represents a localized sensor or module communication disruption rather than component degradation due to wear and tear. The recommended tests here are straightforward: verify the BCM As-Built data and perform a full TPMS re-learn procedure.
The Invisible Culprit: Radio Frequency Interference
Ranked next at 80% likelihood is Radio Frequency Interference. Ford vehicles are known to be sensitive to RFI. Aftermarket 12V accessories, such as USB chargers, dash cameras, power inverters, or high-intensity LED ballasts, can emit electromagnetic interference that jams the TPMS signals, causing the TPMS module to lose communication with the sensors. This results in a general signal failure and a total system communication loss. An RFI elimination test, which simply means unplugging aftermarket accessories one by one, is the right first step before replacing any hardware.
Module and Wiring Failures
If configuration and interference are ruled out, the focus shifts to the hardware. A faulty TPMS receiver module, ranked at 70%, could be the issue. The receiver, whether a standalone Remote Transceiver Module or integrated into the BCM, is responsible for receiving signals from all tire pressure sensors. An internal fault or manufacturing defect within this module can lead to a complete loss of communication with the sensors. Testing the TPMS module power and ground, along with the CAN bus communication, is required.
Finally, ranked at 60%, is a wiring harness or connector issue to the TPMS module. Damaged, corroded, or loose wiring and connectors in the harness leading to the TPMS receiver can interrupt power, ground, or critical data communication lines. A visual inspection of the wiring and connectors, followed by continuity and resistance tests, will confirm if the physical connections are intact.
Are you seeing similar configuration or RFI issues on newer Rangers in your bays?
