B3144

Code

Generic B — Body

Immobilizer Transponder Circuit Malfunction

Brand: Generic

Type: B — Body

Views: UK: 8 EN: 11 RU: 8

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Page language: EN

Damaged or failed key transponder (worn or broken key/transponder chip)
Faulty or misaligned antenna/coil ring around the ignition cylinder or push‑button reader
Open/shorted wiring or poor connector connection between antenna and immobilizer module
Blown fuse or supply/ground fault to immobilizer/antenna circuit
Faulty immobilizer control module or body control module (BCM)
Corrosion or water intrusion at connectors or antenna assembly

Engine cranks but does not start, or no crank/starting disabled
Security/immobilizer warning lamp illuminated or flashing on dash
Intermittent start problems—vehicle may start with a spare key
Key not recognized message on INFO/cluster display (on equipped vehicles)
No communication between immobilizer and engine control modules or CAN errors logged

Read DTCs with a compatible scan tool; record freeze frame and related codes
Check for additional network/CAN U‑codes (U0100, U0140) that may indicate module communication faults
Verify immobilizer/security lamp behavior on key on and during start
Try known good/spare key or remote to rule out a single damaged transponder
Inspect fuses and relays for immobilizer/BCM; verify power and ground at immobilizer/antenna connector
Visually inspect antenna/coil ring around ignition or key reader and its connector for damage or corrosion

Antenna/reader should present continuity (no open circuit) — consult OEM spec for exact resistance; common ranges are low tens to a few hundred ohms depending on design
When key is inserted/near reader, antenna carrier excitation pulses typically near 125 kHz (low‑frequency) and a modulated response from the transponder is expected
Supply voltage to immobilizer/antenna: typically ignition/switched 12V when key on — verify ~12V at power pin and good ground
CAN or LIN bus communication active between immobilizer/BCM and ECM; check for message traffic with a capable scan tool (CAN speeds commonly 250/500 kbps)
No continuous DC short to ground or battery on antenna signal line — should be pulsed when energized

Confirm B3144 code and note any additional codes or freeze frame data
Verify symptom: confirm whether vehicle is immobilized or intermittent; test with known good spare key
Inspect key and keyring for damage; check smart‑key battery voltage and replace if low
Check fuses/relays for immobilizer and verify 12V supply and ground at immobilizer module and antenna/reader connector
Perform visual inspection of antenna/coil ring and harness near ignition or push‑button reader; repair damaged wiring/connectors
Measure antenna coil resistance and continuity to module; compare to OEM specification — replace antenna if open/shorted or outside spec
With a suitable oscilloscope, observe antenna excitation waveform during key read — look for carrier presence (~125 kHz) and modulated reply from transponder
Check module power/ground using backprobe; wiggle test harness to reproduce intermittent faults
Scan CAN/LIN network for communication errors; if network faults exist, repair wiring/connectors before replacing modules
If wiring and antenna are good, attempt key reprogram/relearn procedure per OEM service manual; use dealer or advanced diagnostics tool if required
If problem persists after wiring, antenna, and key confirmed good, consider immobilizer/BCM module fault — consult service manual for replacement/repair and security procedures (reprogramming may be required)

Damaged antenna coil around ignition lock (most common when physical key damage or ignition replacement occurred)
Bad connector or pinback corrosion at immobilizer module or antenna leading to intermittent contact
Key transponder is not programmed, damaged, or has dead internal battery (smart key)
Blown fuse or poor ground at the immobilizer module
Failed immobilizer module or BCM after electrical event