Powertrain, generic · Hybrid propulsion

P0A11 DC/DC Converter Enable Circuit/Open

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

General or open-circuit fault on the enable line with which the hybrid or battery control module tells the DC/DC converter that it may deliver power to the 12 V system. In typical designs a high enable level permits converter output, and a CAN message carries the same permission in parallel, so the two can be cross-checked. If the line is open, the converter cannot be switched on reliably and the 12 V battery is no longer charged. No manufacturer documents P0A11 publicly in an official source; Honda's hybrid recall shows what follows when the converter shuts down: charging warning, discharged 12 V battery, possible loss of drive. Low and high faults on the same line are P0A12 and P0A13; status line faults are P0A08 to P0A10.

Likely causes

Broken enable wire or unplugged connector between control module and converter
Corroded or pushed-out terminal at the converter enable pin
Faulty enable output driver in the control module
Faulty enable input inside the DC/DC converter

Symptoms

  • Battery or charging warning light on
  • 12 V battery is not charged and runs down
  • Vehicle may lose motive power after a while

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,500
Time0.5–3 h

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

Parts involved

dcdc converter enable circuitwiring harnesshybrid control module

Related codes

P0A12P0A13P0A08P0A94

References: law.cornell.edu, patents.google.com, static.nhtsa.gov.