Ford F-Series Super Duty 3 P473 airbag control unit repair

What is a Ford F-Series Super Duty 3 P473 airbag control unit?

As soon as you switch on the ignition in the Ford F-Series Super Duty 3 P473, the airbag control unit performs a self-test. It is the central control unit of the restraint system (SRS): it evaluates the signals from the crash sensors, decides within milliseconds in an accident whether to deploy airbags and seatbelt pretensioners, and indicates faults via the airbag warning light.

In the Ford F-Series Super Duty 3 P473 (2011 to 2016), this unit works in the background as long as everything is in order. At every start it checks itself and the connected components. If it finds an anomaly, the warning light stays on and the fault is stored in the fault memory.

If an accident occurs, the control unit stores crash data and then locks itself. Without repair, the airbag system is then no longer reliably ready for use.

Why is the Ford F-Series Super Duty 3 P473 airbag control unit defective?

Most often the cause is crash data that remains in the unit after an accident, even if no airbag has deployed. Ageing components, cold solder joints, moisture and corrosion at the connectors, and voltage spikes may also be the cause.

A normal diagnostic tool cannot remove stored crash data.

Other failures develop slowly. The electronics age, solder joints lose their contact, and moisture attacks the contacts of the connectors. A weak battery or jump-starting can produce voltage spikes that stress sensitive components. You often only notice this when the warning light comes on.

The main signs of a defective unit are these: the airbag warning light stays on continuously, the fault memory cannot be cleared, or the diagnostic tool cannot establish a connection to the control unit.

Common error codes for Ford F-Series Super Duty 3 P473 airbag control unit repair

The codes for the Ford F-Series Super Duty 3 P473 point to various types of fault: internal faults of the control unit, faults in the memory and in communication, stored crash data and interrupted firing circuits of the front airbags.

In connection with this vehicle, the following error codes appear most often:

• B1342 → Internal fault in the airbag control unit
• U2017 → Memory fault in the restraint system control unit
• B1231 → Crash event memory full, accident data stored
• U0151 → Communication with the control unit lost
• B0001 → Driver front airbag, first stage, firing circuit open
• B0002 → Driver front airbag, second stage, firing circuit open
• B0010 → Passenger front airbag, first stage, firing circuit open
• B0011 → Passenger front airbag, second stage, firing circuit open

The codes are read out with a diagnostic tool. A single code does not prove that the control unit is defective, as connectors, wiring or an airbag module may just as well be the trigger. Only testing the unit brings clarity.

What part numbers are available for the Ford F-Series Super Duty 3 P473 airbag control unit repair?

You will find the part number, which defines the exact version, on the label of the control unit. Depending on equipment and year of manufacture, there are different numbers within a model series.

The following numbers are known for the Ford F-Series Super Duty 3 P473, although the list does not claim to be complete:

• BC3Z-14B321-M
• DC3T-14B321-BA
• DC3T-14B321-BB
• DC3T-14B321-DC
• DC3Z-14B321-D

Compare the number on your unit with this list. This only ensures that it is the right unit. Whether there is a defect only becomes clear when the fault memory is read out or when the unit is tested.

The route to repair looks like this: first have the fault memory read out, then disconnect the battery and remove the control unit. Then you create a repair order online and send the unit to us. Checking, repairing and testing usually take 3–4 working days at Airbag24. The repaired control unit comes back with all vehicle data and is ready for use as soon as it is refitted — no coding or programming is required.