U0168Lost Communication With Vehicle Security Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- How the car detects it
- U0168 points to the vehicle security control module, which handles anti-theft and key authorisation and in many layouts also hosts the immobilizer handshake. Chrysler shows the link: its 2011 field report names U0168 for the SKREEM/WCM, and bulletin 18-023-13 (Grand Voyager 2.8 L diesel 2012-2013) treats it as a sign of a failed ignition handshake that new PCM software fixes. Jeep TSB 08-088-25 (Grand Cherokee 4xe 2024) lists it with MIL and a no-start. Mercedes stores U0168 in the 48 V starter-alternator of the 2021 S 580 for the electronic ignition lock; the MIL clears after three drive cycles. GM's Saab list calls it the keyless entry module. U0167 is the immobilizer module, U0427 invalid security data.
- What you may notice
- No start or delayed start
- Check engine light on (Jeep 4xe, Mercedes S 580)
- Keyless entry, alarm or key detection not working
- Likely causes
- LikelyEngine or security module software mishandles the key handshake (Chrysler, Jeep, Mercedes updates)
- PossibleSecurity module without power or ground
- PossibleBus line or connector to the security module faulty
- RareSecurity or keyless entry module faulty
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.