Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B2589 — Back Up Lamp Open

B2589 — Back Up Lamp Open

Detailed page for trouble code B2589.

34,624codes
59brands
11,925generic
22,699specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B2589

HYUNDAI B — Body

Back Up Lamp Open

Brand: HYUNDAI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burnt out or removed reverse (backup) bulb(s)
  • Open wiring between the bulb socket and body control module (broken conductor, chafing, connector separation)
  • Corroded or damaged bulb socket/terminal or connector
  • Faulty ground at lamp or chassis ground point
  • Blown fuse protecting the tail/backup circuit
  • Faulty reverse light switch (transmission/selector switch)

Symptoms

  • Backup/reverse lamps do not illuminate when vehicle placed in reverse
  • Intermittent or one-side reverse light operation (one bulb works, the other does not)
  • Related systems (reverse camera, parking sensors, trailer lighting) may not activate if they use the same reverse signal
  • No voltage present at lamp socket when in reverse

What to check

  • Verify vehicle in reverse (parking brake applied, wheels chocked) and confirm backup lamp condition visually
  • Check fuse(s) for tail/back-up lamps for continuity and correct rating
  • Inspect bulb(s) visually and by swapping known-good bulb or testing with a 12V source
  • Measure DC voltage at the lamp socket with a multimeter while vehicle is in reverse — check both supply and ground
  • Inspect connectors and wiring for corrosion, bent pins, broken wires, or water ingress
  • Check continuity between lamp socket ground and chassis ground (should be near 0 Ω)

Signal parameters

  • Expected voltage at lamp supply pin: ~11–14 V when gear is in reverse
  • Expected voltage at lamp supply pin: ~0 V (or open) when not in reverse
  • Continuity: lamp filament ~2–5 Ω (typical incandescent); continuity open (OL) indicates broken filament or open wiring
  • Ground continuity: near 0 Ω from bulb socket ground to chassis ground
  • Current draw: typical incandescent backup lamp 0.3–1.5 A depending on bulb wattage; minimal/no current indicates open circuit

Diagnostic algorithm

  1. Confirm complaint and safety: park safely, chock wheels, engage reverse gear (engine off or running per manufacturer procedures).
  2. Visual inspection: check bulbs, sockets, connectors and harness for damage or corrosion; replace burnt-out bulbs and retest.
  3. Fuse check: verify related fuses are intact and seated properly; replace if blown and retest. If fuse blows again, suspect short to power/ground and stop to avoid damage.
  4. Voltage at socket: with reverse engaged, backprobe the lamp supply at socket. If ~12 V present and lamp does not light, replace bulb/socket. If no voltage, continue.
  5. Ground check: measure continuity between bulb ground terminal and chassis ground. Repair poor ground as needed.
  6. Trace wiring: if no voltage at socket, backprobe harness toward rear module/BCM. Look for open, disconnection, or damaged wiring; repair or splice as needed.
  7. Reverse switch/range sensor: verify reverse switch output at transmission or shift assembly (if the reverse lamp feed originates here) — confirm it provides signal when in reverse.
  8. Module check: if wiring and switch are good but no lamp supply, inspect BCM/IPM outputs and connector for damage. Compare reference readings to wiring diagram. Replace module only after verifying wiring and outputs are correct.
  9. After repair: reassemble, clear any related DTCs, and verify lamp operation and related systems (camera/sensors) work properly.

Likely causes

  • Failed bulb or lamp filament
  • Open/loose connector at lamp socket
  • Wiring harness damage (pinched, cut, or disconnected) near rear lights or trunk lid
  • Poor ground at lamp mounting point
  • Blown/loose fuse for lighting circuit
  • Faulty reverse switch not closing on reverse gear engagement

Fault status

⚠️ Status
B2589 — Back Up Lamp Open: an open circuit was detected in the reverse/back-up lamp circuit; backup lamp(s) not receiving expected voltage.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2588 B2590 B2570
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .