Network, generic (extended)

U302A Control Module A Disable Feedback Circuit High

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

U302A means the readback from module A's disable path is stuck above its valid range, for example through a short to a supply wire. The risk is a false all-clear or a false alarm, depending on which level stands for disabled. In a test sequence like the six-step shutoff check of FCA patent US10676100B2, a feedback that never drops will fail the steps where a shutdown is commanded, and the controller must assume the shutdown path does not work. FCA notes that such a result would eventually need a fault flag, and that blocking the vehicle outright could strand the driver, so it proposes rerouting the signal through another processor to keep availability. No manufacturer documents U302A publicly. Check the readback wire for contact with powered circuits and the connectors for moisture.

Likely causes

Feedback wire shorted to a battery or supply wire

Corrosion bridging the readback pin to a neighbouring supply pin

Module A driving its feedback output permanently high

Symptoms

System warning and function of module A unavailable
In hybrids, possibly no ready mode or reduced drive power

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 feedback afeedback wiring

Related codes

U3028 U3029 U3027

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