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Home / DTC / U3006 — Control Module Input Power A Circuit/Open

U3006 — Control Module Input Power A Circuit/Open

Detailed page for trouble code U3006.

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Code

U3006

Generic U — Network/User

Control Module Input Power A Circuit/Open

Brand: Generic
Type: U — Network/User
Views: UK: 17 EN: 29 RU: 24
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Page language: EN

Causes

  • Blown fuse or fusible link for the module power supply
  • Disconnected, corroded, or damaged battery/ignition power wiring or connector
  • Loose or poor battery connections or engine/chassis ground
  • Intermittent or failed power distribution relay
  • Faulty control module (internal power circuit failure)
  • Aftermarket accessory or recent repair disturbed wiring

Symptoms

  • Module-related systems inoperative or intermittent (instrument cluster features, body functions, drivability features depending on module)
  • Illuminated warning lamps or multiple communication fault messages
  • Stored module communication errors or other U-codes
  • Vehicle may not start if a critical module loses power
  • Random loss of functions controlled by the affected module

What to check

  • Scan for related DTCs and note freeze-frame data and module presence on the network
  • Measure battery voltage with key off and key on (nominal ~12.4–12.8 V resting, ~13.5–14.8 V charging)
  • Verify continuity and voltage at the module power pin(s) with key ON (backprobe the connector where practical)
  • Inspect and test fuses, fusible links, and power distribution relays feeding the module
  • Visually inspect harness, pins and connector for corrosion, bent pins, burn, or water intrusion
  • Check main battery positive and negative terminals and engine/chassis ground connections for tightness and corrosion

Signal parameters

  • Module input power (Power A) expected: battery voltage present when key ON — typically 11–14.5 V
  • Ignition-switched supply should be near battery voltage with key to RUN
  • No-voltage/open = near 0 V at supply pin when it should be powered
  • High-resistance condition may show voltage significantly lower than battery under load (voltage drop under 0.5–1.0 V is suspicious)
  • Current draw: abnormal spikes or zero current if circuit open (requires clamp meter for in-circuit measurement)

Diagnostic algorithm

  1. Record scans: note U3006 freeze frame, related codes, and which module reported the fault.
  2. Check battery condition and terminal connections; charge or replace if low. Re-scan.
  3. Inspect fuses and fusible links in the power distribution center for the affected module; replace any blown items and re-test.
  4. With key ON, backprobe the module power (Input Power A) pin and verify expected voltage. If 0 V, trace back toward fuse/relay/battery to find open.
  5. Wiggle test connectors and wiring while monitoring voltage to find intermittent opens. Repair or secure damaged wiring/connectors.
  6. Check power distribution relay (if used) for proper operation and swap with known-good relay if appropriate.
  7. Verify grounds for the module and main chassis/engine grounds; clean and tighten as needed.
  8. If wiring and fuses are intact and proper voltage reaches the module but code persists, verify module ground return and consider replacing or reprogramming module per manufacturer procedure.
  9. After repairs, clear codes and perform functional test and road test as required to confirm the fault does not return.

Likely causes

  • Open or corroded connector at the module power pin
  • Blown main power fuse or fusible link feeding the module
  • Broken wire or chafed harness on ignition-switched power circuit
  • Weak or missing battery terminal/ground connection causing voltage drop
  • Failed power distribution relay that supplies the module

Fault status

⚠️ Status
Control Module Input Power A Circuit/Open — the control module detected an open or missing voltage on its primary power input (Input Power A). This indicates the module is not receiving expected supply voltage or there is an open/high-resistance condition in the power circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U3000 U3001 U3007 U0100 P0562
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