U3507 code meaning
Control Module Input Power B Circuit Intermittent/Erratic
What U3507 means
U3507 covers an unsteady supply B: the voltage is mostly in range but drops out or jumps for short moments. Since B often powers stages such as motors or valves, the dropouts typically appear when these draw current, for instance while braking or steering. GM's brake booster tables show that the module judges B over short and long windows (0.2 s up to 90 s); a fault that merely flickers fits neither the low nor the high code and counts as erratic. No manufacturer documents U3507 publicly. Suspect loose crimp contacts, worn fuse holders, corroded grounds and chafed wires, and test under load with a recording meter or scope. If U3505 or U3018 are stored as well, the feed has probably dropped out completely at times.
U3507 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U3507
- Brief function dropouts when power stages switch on
- Code returns sporadically and is hard to reproduce
Common causes of U3507
- Most likelyLoose crimp or worn fuse holder in feed B
- PossibleCorroded ground point of the module
- PossibleChafed wire with intermittent contact
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Module power bPower wiring
What each part of U3507 means
| U | Network system: communication between the control modules (CAN bus). |
| 3 | Reserved range, usually generic. |
| 07 | The exact fault in that area. |
What to do next
- Note U3507 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 U3507
What does U3507 mean?
U3507 means "Control Module Input Power B Circuit Intermittent/Erratic". U3507 covers an unsteady supply B: the voltage is mostly in range but drops out or jumps for short moments. It is a generic code, so it means the same on every make.
Is it safe to drive with U3507?
Drive gently and only to a workshop. With U3507 the car can go into limp mode (reduced power) to protect itself.
Will U3507 fail an emissions test?
U3507 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 U3507 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U3507 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.