U3007

Code

HYUNDAI U — Network/User

Control Module Input Power “B”

Brand: HYUNDAI

Type: U — Network/User

Views: UK: 12 EN: 16 RU: 13

AI status

Completed

ready

Completed 100%

Page language: EN

Blown fuse or faulty fusible link for the module power circuit
Defective power/ignition relay feeding the module
Open, short, high-resistance, or corroded wiring in the module power feed (Input Power B)
Poor or missing battery/ground connections
Water intrusion or connector damage at the module
Faulty control module internal power circuitry

One or more system warning lights or messages (depending on affected module)
Loss of communication with the affected module (CAN/BUS messages)
Intermittent or permanent malfunction of functions controlled by the module
No-crank or no-start if module is critical to starting circuit (depending on module)
Erratic behavior of systems when vehicle is running or during key cycles

Read DTCs and freeze-frame data; note which module reported U3007 and conditions (key position, engine run/crank)
Inspect battery voltage at rest and while cranking (should be ~12.4V resting, >9.5V while cranking depending on vehicle)
Check related fuses and relays for continuity and proper operation (replace if suspect)
Visually inspect wiring and connectors at the reported module and along harness for damage, corrosion, water, or pin push-out
Measure supply voltage at module power pin(s) with key ON and during crank; verify ignition-switched and constant feeds as applicable
Check ground connections for low resistance and tightness (chassis and battery grounds)

Module Input Power B voltage: ~12V (battery voltage) with key ON or as specified by service manual (typically within 0.5–1.0V of battery)
Voltage drop between battery positive and module power pin:
Ground resistance from module chassis/ground pin to battery negative:
No unexpected voltage spikes or reverse polarity on the power pin
During crank: module power should remain above minimum threshold required by manufacturer (often >9–10V)

Retrieve all stored codes and freeze-frame data. Identify which control module logged U3007 and note operating conditions.
Inspect battery condition and terminals. Clean and tighten battery terminals. Record battery voltage at rest and during crank.
Locate fuses/relays for the affected module's power circuits. Visually inspect and test fuses for continuity; test relay operation or swap with known-good identical relay.
With ignition ON, measure voltage at the module power pin(s) (Input Power B). Compare to battery voltage and service specifications.
If voltage is low or intermittent, inspect wiring harness and connector for corrosion, bent pins, water intrusion, or damaged insulation. Repair or replace damaged connectors/wiring.
Check ground(s) for the module. Clean and tighten ground connections. Measure resistance to battery negative.
Perform a voltage drop test between battery positive and module power feed, and between module ground and battery negative, under key ON and cranking conditions.
If wiring and external power/grounds are good and voltages are within spec but the fault persists, consider module internal power fault — consult service manual for bench/advanced tests or replace module only after confirming wiring/service power is good.
After repairs, clear codes, perform functional tests and road test. Re-scan to confirm U3007 does not return and verify related system operation.

Blown fuse on the specific Input Power B circuit
Connector pin corrosion or poor mating causing intermittent contact
Broken or chafed wire in harness where it flexes or rubs
Weak battery or poor battery terminal connection producing low voltage under load
Faulty ignition-switched relay not supplying power when key on
Module damaged by prior overvoltage, water, or short

⚠️ Status

Control Module Input Power 'B' circuit fault — module power supply is low, missing, or intermittent; module may lose function or communication.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

U3007 — Control Module Input Power “B”