Network, generic (extended)

U3014 Control Module Input Power D Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U3014 is the fourth member of the input power series and means feed D of a module is absent or open. Four separate feeds are rare, so the code appears mainly on central body controllers or power distribution units with several power stages. As with U3013, no maker publishes a definition for it, and the letter only follows that module's pin plan. Where maker data exists for the A and B codes, the supplies are compared with one another, as in GM's brake module, or a single feed must reach a minimum voltage before a load test. Mazda's SA-023-23 shows how a drained battery leaves supply codes in several modules at once, which is why a single D entry is better explained by its own fuse or pin. Not emission-relevant; whether a lamp lights depends on the module.

Likely causes

Blown fuse feeding input D
Loose terminal or damaged wire on supply D
Flat battery, then usually with further supply codes in other modules

Symptoms

  • Individual consumers or functions of the module not working
  • Often stored together with other input power codes after a battery problem

Repair estimate

DifficultyMediumDIY possible
Parts and labour€10–300
Time0.3–2 h

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

Parts involved

module power dfuse

Related codes

U3013U3006U3007U3003

References: law.cornell.edu, gsi.ext.gm.com, static.nhtsa.gov.