Network, generic (extended)

U3006 Control Module Input Power A Circuit/Open

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Modules with heavy loads often take more than one battery feed, and U3006 says feed A is missing or open. Which pin is A depends on the maker. In one GM brake module (25OBDG04B) feed A means KL30_1, which supplies the pump motor: if it falls below 53.85 % of the second feed KL30_2 for 75 ms, a blown fuse or short to ground is assumed, Type B with MIL. A second GM brake supplier (25OBDG03B) sets U3006 when the motor supply is under 5 V before the start-up motor test, also Type B. Both feeds there are permanent battery positive, not an ignition line. Jeep's 08-106-21 lists U3006-00 next to U3007-00 on 2021 Wrangler 4xe with a weak 12 V battery and MIL, and Mazda's SA-023-23 shows U3006:01 in the CX-5 parking brake module after battery drain.

Likely causes

Blown or loose fuse in the feed A path
Discharged 12 V battery pulling the feed below the check limit
Corroded terminal, loose pin or chafed wire on supply A
Internal power switch or board fault in the module

Symptoms

  • ABS, stability or parking brake warning lamps on
  • Function of the module limited or switched off
  • Check engine light on in some vehicles

Repair estimate

DifficultyMediumDIY possible
Parts and labour€10–400
Time0.3–2.5 h

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

Parts involved

module power afusepower wiring

Related codes

U3007U3013U3014U3018U3003

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.