B2599 Code: Meaning, Symptoms, Causes & Fix

Overview

B2599 is triggered when monitoring logic identifies an issue with Tailgate Release Open Circuit affecting body electronics and comfort modules.

Symptoms

battery draw complaints
related warning lamp illuminated
module resets or glitches

Common causes

Open circuit in wiring affecting tailgate release open circuit
Broken terminal inside harness
Connector pin damage/corrosion or harness stress near related components

How to diagnose B2599

Confirm B2599 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to tailgate release open circuit for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code B2599

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with B2599?

Most vehicles can be driven short-term with B2599, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the tailgate release open circuit circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify B2599 remains cleared under the conditions that originally set the code.

Fix options

Repair open circuit and secure connector lock.
Clear corrosion and protect terminals.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$160-$850

Common mistakes when diagnosing B2599

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

B2599 in common vehicles

B2599 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes B2599?

B2599 is commonly set by open faults affecting tailgate release open circuit.

How much does it cost to fix B2599?

For B2599, repair costs are typically $160-$850 depending on exact root cause, labor rates, and part quality.

Can I clear B2599 without repair?

You can clear B2599 temporarily, but the code usually returns until the underlying fault is corrected.