U3006 code meaning
Control Module Input Power A Circuit/Open
Network system Generic code U30xx codes Check engine light
What U3006 means
Modules with heavy loads often take more than one battery feed, and U3006 says feed A is missing or open. Which pin is A depends on the maker. In one GM brake module (25OBDG04B) feed A means KL30_1, which supplies the pump motor: if it falls below 53.85 % of the second feed KL30_2 for 75 ms, a blown fuse or short to ground is assumed, Type B with MIL. A second GM brake supplier (25OBDG03B) sets U3006 when the motor supply is under 5 V before the start-up motor test, also Type B. Both feeds there are permanent battery positive, not an ignition line. Jeep's 08-106-21 lists U3006-00 next to U3007-00 on 2021 Wrangler 4xe with a weak 12 V battery and MIL, and Mazda's SA-023-23 shows U3006:01 in the CX-5 parking brake module after battery drain.
U3006 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U3006
- ABS, stability or parking brake warning lamps on
- Function of the module limited or switched off
- Check engine light on in some vehicles
Common causes of U3006
- Most likelyBlown or loose fuse in the feed A path
- PossibleDischarged 12 V battery pulling the feed below the check limit
- PossibleCorroded terminal, loose pin or chafed wire on supply A
- Less likelyInternal power switch or board fault in the module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Module power aFusePower wiring
What each part of U3006 means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 06 | The exact fault in that area. |
What to do next
- Note U3006 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U3006
What does U3006 mean?
U3006 means "Control Module Input Power A Circuit/Open". Modules with heavy loads often take more than one battery feed, and U3006 says feed A is missing or open. It is a generic code, so it means the same on every make.
Is it safe to drive with U3006?
Drive gently and only to a workshop. With U3006 the car can go into limp mode (reduced power) to protect itself.
Will U3006 fail an emissions test?
U3006 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U3006 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U3006 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.