Network, generic (extended)

U3025 Control Module A Disable Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Safety-relevant systems often give a supervising controller a hard-wired line through which it can switch off another module or its power stage, independent of the bus. Bosch patent US6804564B2 describes a first control unit that de-energizes a faulty second unit over such an output line, and FCA patent US10676100B2 shows a hybrid where control processor, motor processor and a monitor each have their own shutoff line to the inverter gate driver. U3025 says this disable line to module A is open or electrically missing. No manufacturer documents U3025 publicly. A broken line is serious either way: depending on the logic, module A may treat it as a permanent shutdown request and refuse to run, or stopping it in an emergency becomes impossible, which is why the system usually keeps the function off.

Likely causes

Broken disable wire or unplugged connector between the two modules
Corroded or pushed-out pin on the disable line
Output driver of the supervising module no longer driving the line
Input stage of module A misreading the line

Symptoms

  • Function of module A unavailable, e.g. drive system not ready
  • System warning message in the cluster

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–1,200
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

module disable acontrol wiring

Related codes

U3026U3027U3028P2C96

References: law.cornell.edu, patents.google.com, patents.google.com.