U0427 code meaning
Invalid Data Received From Vehicle Security Control Module
What U0427 means
The vehicle security control module looks after theft protection: alarm, door, hood and tailgate monitoring and, with some makers, the key authorisation for the engine. U0427 marks messages from this module that reach a partner but fail its checks. No manufacturer documents U0427 publicly; GM's 2013 bulletin PIP5094 only names it among many codes for which terminal fit comes before circuit tests. Chrysler shows how far the module may reach: bulletin 18-023-13 for the 2012-2013 Grand Voyager 2.8 L diesel names its wireless control module the vehicle security control module in U0168 and treats that code as a sign of a disturbed ignition handshake, cured by PCM software. If it joins the key check, the start may be refused; otherwise alarm or remote locking misbehave. U0168 is lost contact, U0327 software. No MIL is expected.
U0427 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0427
- Alarm triggers falsely or cannot be armed
- Remote locking or keyless functions unreliable
- Engine start refused on vehicles where the module joins the key check
Common causes of U0427
- PossibleSecurity control module faulty or reset during start-up
- PossibleAftermarket alarm or remote start interfering with the module or its supply
- Less likelyPoor terminal fit or corrosion at the module connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Vehicle security module
What each part of U0427 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 27 | The exact fault in that area. |
What to do next
- Note U0427 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 U0427
What does U0427 mean?
U0427 means "Invalid Data Received From Vehicle Security Control Module". The vehicle security control module looks after theft protection: alarm, door, hood and tailgate monitoring and, with some makers, the key authorisation for the engine. It is a generic code, so it means the same on every make.
Is it safe to drive with U0427?
U0427 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0427 fail an emissions test?
U0427 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 U0427 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0427 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.