Network, generic (extended)

U3007 Control Module Input Power B Circuit/Open

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

U3007 is the partner code for the second battery feed, B. In GM's 25OBDG04B brake module B is KL30_2, the supply for the valve coils: the module compares it with KL30_1 and sets U3007 when it stays below 53.85 % of that value for 75 ms, and also when the switch for valve power reports less than half the supply voltage for 50 ms; Type B with MIL. The other GM brake supplier (25OBDG03B) uses U3007 differently, for charge-pump tests that could not run three times because both internal supply paths were in undervoltage. So B is a separate fused feed, not a backup of A, and a fault on B alone points to its own fuse or pin. Jeep's 08-106-21 for the 2021 Wrangler 4xe lists U3007-00 first among codes cured by charging or replacing the 12 V battery.

Likely causes

Blown or poorly seated fuse feeding input B
Low battery voltage making feed B fail the comparison
Damaged wire or spread terminal on supply B
Valve power switch or internal supply path in the module faulty

Symptoms

  • ABS and stability control warnings, functions shut off
  • Check engine light on in some vehicles
  • Often stored together with U3006 when the battery is weak

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 bfusepower wiring

Related codes

U3006U3013U3014U3018U3019

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