Code
B2523
HYUNDAI
B — Body
Turn Signal LH Rear Circuit Short to Ground
Views:
UK: 22
EN: 29
RU: 35
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (chafed or pinched conductor) on left rear turn signal circuit
- Corroded or bent connector pins at rear lamp or harness connector
- Failed turn signal bulb (internal short) or incorrect replacement bulb (LED vs incandescent mismatch)
- Water intrusion in lamp assembly or connector creating a ground path
- Faulty BCM or turn signal driver transistor (less common)
- Aftermarket trailer wiring or accessories tied into the circuit
Symptoms
- Left rear turn signal not functioning or inoperative
- Turn signal indicator may flash rapidly or not at all
- Other exterior lights on same circuit may be affected (e.g., parking or tail lamp)
- Possible blown fuse or repeated lamp failures
- DTC B2523 stored and possibly MIL not illuminated (body code stored in BCM)
What to check
- Scan tool: read/record all stored codes and freeze frame, clear codes and re-check
- Visual inspection of left rear lamp, socket, and wiring for corrosion, damage, or water
- Inspect connector pins for corrosion, bending or pushed-out terminals
- Check bulb type and condition (remove bulb and inspect for blackening or internal shorts)
- Measure voltage at lamp connector with turn signal switched ON (expect pulsed 12V for working circuit)
- Perform continuity/insulation test between the turn signal circuit and chassis ground with harness disconnected to detect a short
Signal parameters
- Key ON, turn signal OFF: open/high resistance between circuit and ground (no continuity)
- Turn signal ON: pulsed voltage ~9–14 V at lamp connector (for incandescent bulbs); duty cycle depends on flasher/BCM
- Incandescent bulb typical filament resistance: ~2–10 ohms (cold), low resistance when measured with ohmmeter
- LED lamp (if present): much higher DC resistance and requires BCM/ resistor; may show near-open when unpowered
- Short to ground: low resistance to chassis ground (
Diagnostic algorithm
- Use a scan tool to confirm B2523 and note any related codes. Clear codes and attempt to reproduce.
- Visually inspect left rear lamp assembly, bulb, socket and connector for corrosion, water, or damage. Replace bulb if suspect.
- Disconnect left rear lamp connector. With ignition ON, measure voltage at BCM-side connector while operating the left turn signal: expect pulsed 12V. If pulsed voltage is present and bulb side is shorted, the problem is in lamp/connector/wiring.
- With connector disconnected and power OFF, check resistance between the lamp circuit wire and chassis ground. Low resistance indicates a short to ground in wiring or lamp assembly.
- If short present, isolate by unplugging intermediate connectors and inspecting harness segments. Repair any chafed wires or damaged insulation. Use an ohmmeter to locate the open/short boundaries.
- If no short at lamp connector and BCM driver does not output voltage when commanded, test BCM output driver per manufacturer procedures (may require a lab scope or specific BCM tests).
- Inspect for aftermarket trailer wiring or accessories tied into the circuit and remove/repair as necessary.
- After repairs, reconnect everything, clear codes, and verify proper operation of left rear turn signal under multiple conditions. Re-scan to confirm code does not return.
Likely causes
- Corroded/damaged connector at left rear lamp
- Wiring chafe or pinched wire in rear harness (short to body ground)
- Failed/incorrect bulb or socket fault
- Water in lamp assembly causing leakage to ground
- BCM driver fault (if wiring and lamp check OK)
Fault status
Status
Left rear turn signal circuit short to ground detected by BCM. Fault stored as B2523. Inspect lamp, connector and wiring for short to chassis ground; replace or repair faulty components. If wiring and lamp check OK, investigate BCM output driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Code
B2523
Other
B — Body
License Lamp Circuit Failure
Views:
UK: 20
EN: 33
RU: 33
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (chafed or pinched conductor) on left rear turn signal circuit
- Corroded or bent connector pins at rear lamp or harness connector
- Failed turn signal bulb (internal short) or incorrect replacement bulb (LED vs incandescent mismatch)
- Water intrusion in lamp assembly or connector creating a ground path
- Faulty BCM or turn signal driver transistor (less common)
- Aftermarket trailer wiring or accessories tied into the circuit
Symptoms
- Left rear turn signal not functioning or inoperative
- Turn signal indicator may flash rapidly or not at all
- Other exterior lights on same circuit may be affected (e.g., parking or tail lamp)
- Possible blown fuse or repeated lamp failures
- DTC B2523 stored and possibly MIL not illuminated (body code stored in BCM)
What to check
- Scan tool: read/record all stored codes and freeze frame, clear codes and re-check
- Visual inspection of left rear lamp, socket, and wiring for corrosion, damage, or water
- Inspect connector pins for corrosion, bending or pushed-out terminals
- Check bulb type and condition (remove bulb and inspect for blackening or internal shorts)
- Measure voltage at lamp connector with turn signal switched ON (expect pulsed 12V for working circuit)
- Perform continuity/insulation test between the turn signal circuit and chassis ground with harness disconnected to detect a short
Signal parameters
- Key ON, turn signal OFF: open/high resistance between circuit and ground (no continuity)
- Turn signal ON: pulsed voltage ~9–14 V at lamp connector (for incandescent bulbs); duty cycle depends on flasher/BCM
- Incandescent bulb typical filament resistance: ~2–10 ohms (cold), low resistance when measured with ohmmeter
- LED lamp (if present): much higher DC resistance and requires BCM/ resistor; may show near-open when unpowered
- Short to ground: low resistance to chassis ground (
Diagnostic algorithm
- Use a scan tool to confirm B2523 and note any related codes. Clear codes and attempt to reproduce.
- Visually inspect left rear lamp assembly, bulb, socket and connector for corrosion, water, or damage. Replace bulb if suspect.
- Disconnect left rear lamp connector. With ignition ON, measure voltage at BCM-side connector while operating the left turn signal: expect pulsed 12V. If pulsed voltage is present and bulb side is shorted, the problem is in lamp/connector/wiring.
- With connector disconnected and power OFF, check resistance between the lamp circuit wire and chassis ground. Low resistance indicates a short to ground in wiring or lamp assembly.
- If short present, isolate by unplugging intermediate connectors and inspecting harness segments. Repair any chafed wires or damaged insulation. Use an ohmmeter to locate the open/short boundaries.
- If no short at lamp connector and BCM driver does not output voltage when commanded, test BCM output driver per manufacturer procedures (may require a lab scope or specific BCM tests).
- Inspect for aftermarket trailer wiring or accessories tied into the circuit and remove/repair as necessary.
- After repairs, reconnect everything, clear codes, and verify proper operation of left rear turn signal under multiple conditions. Re-scan to confirm code does not return.
Likely causes
- Corroded/damaged connector at left rear lamp
- Wiring chafe or pinched wire in rear harness (short to body ground)
- Failed/incorrect bulb or socket fault
- Water in lamp assembly causing leakage to ground
- BCM driver fault (if wiring and lamp check OK)
Fault status
Status
Left rear turn signal circuit short to ground detected by BCM. Fault stored as B2523. Inspect lamp, connector and wiring for short to chassis ground; replace or repair faulty components. If wiring and lamp check OK, investigate BCM output driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
Repair manuals
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