What Does U3006 Mean?
DTC U3006 indicates that a control module has detected a fault on its primary power input circuit, designated as power input 'A.' Most control modules have multiple power feeds for redundancy and to separate high-current and logic power. This code means the voltage on the 'A' power feed is out of range — too high, too low, open, or intermittent — which can impair module operation and cause erratic behavior.
Common Causes
35%
Open or high-resistance connection in the power input 'A' feed wire to the control module — corroded connector pin, broken wire, or faulty splice
30%
Blown fuse or degraded fuse contact in the circuit supplying power input 'A' to the module
20%
Faulty ignition relay or power distribution relay that supplies the 'A' power feed
15%
Internal control module power input circuit failure — module's internal regulator or input protection on the 'A' pin
Diagnostic Steps
1
Step 1: Identify which control module set the code and locate the power input 'A' pin in the module's wiring diagram — this is typically a key-on power feed through a specific fuse.
2
Step 2: With ignition on, measure voltage at the module's power input 'A' pin — should read battery voltage (12.2-14.5V); if low or absent, trace the circuit back toward the fuse box.
3
Step 3: Check the corresponding fuse — verify continuity with a test light or multimeter; also check for voltage on both sides of the fuse with the circuit loaded to detect high-resistance fuse contacts.
4
Step 4: Inspect the connector at the module for pushed-back pins, corrosion, water intrusion, or heat damage on the power input 'A' terminal — repair or replace the connector as needed.
5
Step 5: Perform a voltage drop test on the entire power feed circuit under load (turn on accessories that the module powers) — total circuit drop should be less than 0.5V from fuse box to module pin.
Estimated Repair Cost
$50 - $500
Parts + labor, varies by vehicle and location
DTC U3006 indicates that a control module has detected a fault on its primary power input circuit, designated as power input 'A.' Most control modules have multiple power feeds for redundancy and to separate high-current and logic power. This code means the voltage on the 'A' power feed is out of ra...
The most common cause of U3006 (Control Module Input Power "A") is: Open or high-resistance connection in the power input 'A' feed wire to the control module — corroded connector pin, broken wire, or faulty splice
Typical repair costs for U3006 range from $50 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A compromised power feed can cause intermittent module operation, unexpected resets, or complete loss of the affected system's functionality. Severity depends on which module is affected. Diagnose promptly to prevent module damage from voltage irregularities.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U3006 to identify the root cause.
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Quick Info
Category
Network
System
Control Module Power Supply Circuit
Difficulty
Type
Generic (SAE)
Recommended Tools
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