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Home / DTC / U3007 — Control Module Input Power B Circuit/Open

U3007 — Control Module Input Power B Circuit/Open

Detailed page for trouble code U3007.

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U3007

Generic U — Network/User

Control Module Input Power B Circuit/Open

Brand: Generic
Type: U — Network/User
Views: UK: 17 EN: 27 RU: 20
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Page language: EN

Causes

  • Blown or corroded fuse or fusible link for Power B
  • Open, short to ground, or high-resistance wiring in the power feed to the control module
  • Poor or missing battery/ignition-switched voltage to the module
  • Corroded, pushed-out, or damaged connector at the control module
  • Intermittent connection due to broken wire or terminal
  • Faulty control module (internal power input failure)

Symptoms

  • Malfunction of the system(s) controlled by the affected module (loss of features)
  • Multiple related DTCs or loss of module communication on scan tool
  • MIL or warning lights illuminated for affected systems
  • Intermittent operation that may change with engine or ignition state
  • Possible no-crank or no-start if power is critical to engine control
  • Possible battery drain if short to battery present

What to check

  • Read and record freeze-frame and all stored DTCs with a scan tool
  • Verify battery voltage and health (good battery: ~12.4–12.8 V at rest)
  • Inspect fuses, fusible links and relays for the Power B circuit
  • Visually inspect wiring harnesses and connectors at the control module for corrosion, damage, or loose terminals
  • Back-probe the module power B pin with ignition ON and OFF to confirm presence/absence of supply voltage
  • Check module grounds for corrosion and low resistance to chassis/negative battery

Signal parameters

  • Battery resting voltage: ~12.2–12.8 V (engine off)
  • Charging system voltage: ~13.5–14.7 V (engine running)
  • Module Input Power B with IGN ON: within 0.5 V of battery voltage
  • During crank: voltage typically above 9.0 V (depends on vehicle)
  • Expected DC resistance from battery positive/fuse to module power pin: very low (typically
  • Open-circuit indication: very high resistance or infinite (>10 kΩ)

Diagnostic algorithm

  1. Verify and record all codes and freeze frame data with a scan tool; do not replace module yet.
  2. Check battery state-of-charge and terminals for tightness and corrosion; charge or replace battery if needed.
  3. Inspect and test fuses, fusible links and relays for the Power B feed; replace any suspect components.
  4. With ignition OFF, visually inspect the control module connector for corrosion, bent pins, or pushed-out terminals; repair/clean as needed.
  5. With key ON (engine off), back-probe the module Input Power B terminal and measure voltage; compare to battery voltage. Note any large voltage drop.
  6. If no voltage, trace the feed back to the fuse/relay and battery using a wiring diagram; check continuity and resistance to battery positive and to the fuse. Repair any open/high-resistance sections.
  7. If voltage is present but intermittent, perform wiggle tests on harnesses and probe while moving wiring and connector to reproduce the fault; repair broken wires or poor terminals.
  8. Check all module grounds for low resistance to battery negative (
  9. If wiring and supply are verified good and stable but the code persists, consider module internal failure; consult manufacturer service information before replacing the control module.
  10. After repairs, clear codes, verify that Input Power B returns to normal, and road-test to confirm fault does not return.

Likely causes

  • Blown fuse or fusible link feeding module Input Power B
  • Damaged/open harness or connector pin to the module power input
  • Corroded connector or poor crimp at power/ground connection
  • Ignition switch or relay fault preventing switched power to the circuit
  • Failed control module after wiring and supply verified good

Fault status

⚠️ Status
Control Module Input Power B Circuit/Open — open or insufficient voltage at module Power B input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U3000 U3001 U3002 U3003 U3004 U3005
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