U3007

Code

Generic U — Network/User

Control Module Input Power B Circuit/Open

Brand: Generic

Type: U — Network/User

Views: UK: 23 EN: 85 RU: 30

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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)

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

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

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)

Verify and record all codes and freeze frame data with a scan tool; do not replace module yet.
Check battery state-of-charge and terminals for tightness and corrosion; charge or replace battery if needed.
Inspect and test fuses, fusible links and relays for the Power B feed; replace any suspect components.
With ignition OFF, visually inspect the control module connector for corrosion, bent pins, or pushed-out terminals; repair/clean as needed.
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.
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.
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.
Check all module grounds for low resistance to battery negative (
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.
After repairs, clear codes, verify that Input Power B returns to normal, and road-test to confirm fault does not return.