U0326 code meaning
Software Incompatibility With Vehicle Immobilizer Control Module
What U0326 means
The vehicle immobilizer control module checks the transponder or smart key and releases the engine controller only after a coded exchange. U0326 means that a controller, usually the engine controller, does not accept the immobilizer's software or stored codes, mostly once either unit has been renewed or reprogrammed. No manufacturer documents U0326 publicly. Subaru uses its own code for this mismatch on 2016-and-later models: B1571, reference code incompatibility between immobilizer and ECM, found by the keyless access module (18-230-26). Chrysler reprogrammed PCMs of 2012–2013 Grand Voyager diesels because handshake failures with the wireless control module were stored as the wrong codes (18-023-13). U0167 is lost contact, U0426 invalid data, U0327 concerns the security module. The engine may crank but not start.
U0326 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0326
- Engine cranks but does not start, or starts and stalls at once
- Security or key lamp flashes in the cluster
- Keys are not recognised after module work
Common causes of U0326
- Most likelyEngine controller or immobilizer unit replaced without pairing the security codes
- PossibleUsed module from another vehicle fitted, carrying foreign codes
- Less likelySoftware of engine controller and immobilizer on incompatible levels after an update
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Immobilizer moduleECMControl module software
What each part of U0326 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 26 | The exact fault in that area. |
What to do next
- Note U0326 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 U0326
What does U0326 mean?
U0326 means "Software Incompatibility With Vehicle Immobilizer Control Module". The vehicle immobilizer control module checks the transponder or smart key and releases the engine controller only after a coded exchange. It is a generic code, so it means the same on every make.
Is it safe to drive with U0326?
U0326 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0326 fail an emissions test?
U0326 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 U0326 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will U0326 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.