Code
B2616
Generic
B — Body
Immobilizer Transponder Signal Fault
Views:
UK: 0
EN: 0
RU: 0
AI status
Completed
Completed
100%
Causes
- Damaged or non-programmed key/transponder
- Weak or dead battery in a key with remote/transponder battery
- Faulty transponder antenna (coil) or antenna ring at the ignition lock
- Broken, corroded, or loose wiring/connectors between antenna and immobilizer/BCM/ECM
- Faulty immobilizer/transceiver module or BCM
- Software/configuration error or corrupted immobilizer database (key IDs)
Symptoms
- Engine will not crank or start (immobilizer prevents starter or fuel/ignition operation)
- Starter cranks but engine does not fire
- Security/immobilizer warning lamp illuminated or flashing
- Intermittent starting problems that clear with a different key or after moving key position
- No remote start or remote functions may be unaffected (depends on system)
- Possible stored additional communication or EEPROM-related codes
What to check
- Confirm code B2616 with a scan tool and note freeze-frame/related codes
- Try a known-good or spare key to see if the fault follows the key
- Check key battery (if applicable) and replace if low
- Visually inspect antenna ring/coil at ignition lock for damage, corrosion, or loose mounting
- Inspect wiring harness and connectors between antenna and immobilizer/BCM/ECM for continuity, corrosion, or water ingress
- Verify immobilizer/BCM power and ground circuits are within specification
Signal parameters
- Transponder systems commonly use low-frequency (LF) around 125 kHz for power/polling of passive transponders
- Data modulation (ASK/FSK) sent from transponder is decoded by immobilizer — expected valid digital data pattern per manufacturer
- Antenna/transceiver supply voltage should be present (typically vehicle low-voltage supply 5–12 V depending on design) and stable
- Antenna coil continuity/resistance should be within manufacturer specification (check service manual)
- Digital data line between transceiver and immobilizer/BCM should show valid logic levels (0/5V or CAN/serial messages as applicable)
Diagnostic algorithm
- Verify and record stored DTC(s). Check for related codes (BCM/ECM/communication).
- Attempt to start using a known-good or spare programmed key. If spare works, suspect original key/transponder.
- If key uses a battery (integrated remote), check/replace the battery and retest.
- Observe immobilizer/security lamp when key is presented and during crank; note abnormal lamp patterns.
- Visually inspect antenna ring and ignition switch area for damage, foreign objects, or corrosion. Wiggle test connectors for intermittent faults.
- With key in position, measure antenna coil continuity and resistance; compare to service specification. Check for short to ground or open circuit.
- Probe power and ground at the transceiver/antenna module connector; verify proper supply voltages with key in position.
- Use an oscilloscope or diagnostic tool capable of reading LF transponder signals to verify presence and quality of the 125 kHz carrier and modulated response when key is presented.
- Check signal/data line between transceiver and immobilizer/BCM for proper logic levels or valid messages on serial/CAN bus. Repair wiring or connectors as needed.
- If vehicle supports diagnostic key re-learn, attempt reprogramming/re-learning of key per manufacturer procedure; re-test with multiple keys.
- If wiring, antenna, and keys are good but fault remains, consider replacement of the transceiver/antenna ring or immobilizer module and reprogram as required.
- Clear codes and perform full start/drive cycle to confirm repair; monitor for recurrence and re-check related diagnostics if intermittent.
Likely causes
- Key/transponder fault (missing or damaged transponder chip)
- Antenna ring or antenna coil fault at the ignition barrel
- Connector/cable fault or poor ground to immobilizer/transceiver
- Intermittent fault due to corrosion or water damage
- Immobilizer module or BCM hardware/software fault (less common)
Fault status
Status
IMMOBILIZER TRANSPONDER SIGNAL FAULT — immobilizer/BCM/ECM did not detect a valid transponder response or detected an out-of-spec/intermittent transponder signal. Vehicle anti-theft system may prevent engine start.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
B2616
LAND ROVER
B — Body
Body Control Module (BCM) Communication Fault
Views:
UK: 8
EN: 7
RU: 6
AI status
Completed
Completed
100%
Causes
- Damaged or non-programmed key/transponder
- Weak or dead battery in a key with remote/transponder battery
- Faulty transponder antenna (coil) or antenna ring at the ignition lock
- Broken, corroded, or loose wiring/connectors between antenna and immobilizer/BCM/ECM
- Faulty immobilizer/transceiver module or BCM
- Software/configuration error or corrupted immobilizer database (key IDs)
Symptoms
- Engine will not crank or start (immobilizer prevents starter or fuel/ignition operation)
- Starter cranks but engine does not fire
- Security/immobilizer warning lamp illuminated or flashing
- Intermittent starting problems that clear with a different key or after moving key position
- No remote start or remote functions may be unaffected (depends on system)
- Possible stored additional communication or EEPROM-related codes
What to check
- Confirm code B2616 with a scan tool and note freeze-frame/related codes
- Try a known-good or spare key to see if the fault follows the key
- Check key battery (if applicable) and replace if low
- Visually inspect antenna ring/coil at ignition lock for damage, corrosion, or loose mounting
- Inspect wiring harness and connectors between antenna and immobilizer/BCM/ECM for continuity, corrosion, or water ingress
- Verify immobilizer/BCM power and ground circuits are within specification
Signal parameters
- Transponder systems commonly use low-frequency (LF) around 125 kHz for power/polling of passive transponders
- Data modulation (ASK/FSK) sent from transponder is decoded by immobilizer — expected valid digital data pattern per manufacturer
- Antenna/transceiver supply voltage should be present (typically vehicle low-voltage supply 5–12 V depending on design) and stable
- Antenna coil continuity/resistance should be within manufacturer specification (check service manual)
- Digital data line between transceiver and immobilizer/BCM should show valid logic levels (0/5V or CAN/serial messages as applicable)
Diagnostic algorithm
- Verify and record stored DTC(s). Check for related codes (BCM/ECM/communication).
- Attempt to start using a known-good or spare programmed key. If spare works, suspect original key/transponder.
- If key uses a battery (integrated remote), check/replace the battery and retest.
- Observe immobilizer/security lamp when key is presented and during crank; note abnormal lamp patterns.
- Visually inspect antenna ring and ignition switch area for damage, foreign objects, or corrosion. Wiggle test connectors for intermittent faults.
- With key in position, measure antenna coil continuity and resistance; compare to service specification. Check for short to ground or open circuit.
- Probe power and ground at the transceiver/antenna module connector; verify proper supply voltages with key in position.
- Use an oscilloscope or diagnostic tool capable of reading LF transponder signals to verify presence and quality of the 125 kHz carrier and modulated response when key is presented.
- Check signal/data line between transceiver and immobilizer/BCM for proper logic levels or valid messages on serial/CAN bus. Repair wiring or connectors as needed.
- If vehicle supports diagnostic key re-learn, attempt reprogramming/re-learning of key per manufacturer procedure; re-test with multiple keys.
- If wiring, antenna, and keys are good but fault remains, consider replacement of the transceiver/antenna ring or immobilizer module and reprogram as required.
- Clear codes and perform full start/drive cycle to confirm repair; monitor for recurrence and re-check related diagnostics if intermittent.
Likely causes
- Key/transponder fault (missing or damaged transponder chip)
- Antenna ring or antenna coil fault at the ignition barrel
- Connector/cable fault or poor ground to immobilizer/transceiver
- Intermittent fault due to corrosion or water damage
- Immobilizer module or BCM hardware/software fault (less common)
Fault status
Status
IMMOBILIZER TRANSPONDER SIGNAL FAULT — immobilizer/BCM/ECM did not detect a valid transponder response or detected an out-of-spec/intermittent transponder signal. Vehicle anti-theft system may prevent engine start.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
