The B1602 code on your 2022 Volkswagen Jetta indicates the vehicle's KESSY (Keyless Entry, Start, and Exit System) cannot detect the key. This code affects your Jetta's ability to recognize your key fob for keyless entry and push-button starting.
Understanding B1602 on Volkswagen Jetta
The KESSY system uses multiple antennas throughout the vehicle to detect the key's presence. Code B1602 sets when the system cannot locate or communicate with the key fob, preventing keyless operation.
Common Symptoms
- Key not detected message on dashboard
- Push-button start won't work
- Keyless entry not functioning
- Must use backup key blade to enter/start
- Intermittent starting issues
Primary Causes
- Dead or weak key fob battery
- Key fob damage
- KESSY antenna failure
- Wiring issue to antennas
- Comfort control module fault
- Key not properly paired
- Radio frequency interference
Diagnostic Procedure for 2022 Jetta
First, replace the key fob battery - this is the most common cause. Using VCDS or VW scan tool, check KESSY antenna reception data. Test multiple keys if available. Check for visible damage to key fob. Inspect antenna locations for damage or loose connections. Look for RF interference sources (phones, devices stored near key).
Repair Solutions
Replace key fob battery with quality CR2032 or specified type. If key is damaged, obtain new key and have it programmed. Replace faulty KESSY antenna. Repair wiring to antenna system. Ensure no devices cause RF interference with key signal. Use backup key blade procedure as temporary workaround while diagnosing.