U0336 code meaning
Software Incompatibility With Restraints Control Module
What U0336 means
The restraints control module reads the crash sensors and triggers airbags and belt tensioners according to a calibration written for one body style and equipment level. U0336 means a connected unit rejects the software or configuration of this module. Ford's 2014 code interpretation lists U0336 without the MIL marker. Jaguar Land Rover shows why the software level matters: replacement RCMs for the Range Rover Evoque came with software older than the factory level, the tester picked its update from the module content instead of the as-built data, and the unit stored B0002-13 until a manual patch fixed the choice (SSM74259). On 2013 Jaguar XJ AWD cars a generic RCM calibration failed FMVSS 208, leading to recall J040. U0151 is lost contact, U0452 invalid data. The airbag lamp stays on.
U0336 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 U0336
- Airbag warning lamp stays on
- Further restraint codes such as airbag circuit faults stored
- Code appears right after airbag module replacement
Common causes of U0336
- Most likelyReplacement airbag module delivered with an older software level and not brought up to the vehicle level
- PossibleCalibration for another body style, drive or equipment loaded
- Less likelyUsed module from another vehicle installed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Restraints control module
What each part of U0336 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 36 | The exact fault in that area. |
What to do next
- Note U0336 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 U0336
What does U0336 mean?
U0336 means "Software Incompatibility With Restraints Control Module". The restraints control module reads the crash sensors and triggers airbags and belt tensioners according to a calibration written for one body style and equipment level. It is a generic code, so it means the same on every make.
Is it safe to drive with U0336?
U0336 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0336 fail an emissions test?
U0336 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 U0336 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will U0336 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.