B2239

Code

Other B — Body

Rear Cargo Door Set Switch Stuck (Short to Ground)

Brand: Other

Type: B — Body

Views: UK: 22 EN: 22 RU: 19

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Rear cargo door set switch mechanically stuck or welded closed
Short to ground in the switch harness (chafed wire contacting body or ground)
Corroded or water-damaged switch connector
Failed switch internal electronics
Faulty BCM/input module (less common)
Aftermarket equipment or recent repairs that damaged wiring

Symptoms

Trunk/rear cargo door may not lock, unlock, or latch properly
Cargo door open/ajar or switch warning lamp/message on dash
Intermittent or constant detection of cargo door closed when it is open
Affected functions (remote, interior release) may not work or behave erratically
DTC B2239 stored or active in BCM

What to check

Read DTCs with a scan tool, note freeze frame and status (pending/continuous)
Visually inspect switch, housing and connector for corrosion, water, or damage
Back-probe the switch connector with ignition on and monitor voltage/state
Wiggle test the harness at the door hinge while observing switch state
Disconnect the switch; see if DTC clears or the BCM no longer sees ground
Check for aftermarket wiring or recent repairs near the cargo area

Signal parameters

Normal behavior: switch circuit is pulled high by BCM or reference and is grounded when switch closes
Expected voltage (open): close to reference voltage (often ~5V or battery voltage depending on vehicle design)
Expected voltage (closed): ~0.0–0.5 V (grounded)
Continuity: switch closed = low ohms between signal pin and ground; switch open = open/high resistance
Short indication: permanent ~0 V on signal pin with switch disconnected indicates short to ground in harness or module

Diagnostic algorithm

Connect a scan tool, confirm B2239 and note whether code is active or stored. Attempt to reproduce by operating cargo door switch.
Visually inspect the rear cargo door switch assembly, harness, and connector for corrosion, damage, or moisture. Repair or dry as needed.
With ignition ON, back-probe the switch signal wire at the connector. Observe voltage with switch operated and released. Record values.
Disconnect the switch connector. If the BCM still sees the circuit grounded (0 V) with the switch disconnected, suspect a short to ground in the wiring or BCM input.
If the signal goes high when switch disconnected, test the switch itself: measure resistance between signal terminal and ground while actuating. Replace the switch if it remains closed or shows abnormal resistance.
If harness is suspect, perform continuity checks between the signal pin and chassis ground, and inspect/repair any short points (hinge, body panels). Use an ohmmeter and isolate wiring from chassis when testing.
If no short in wiring and new switch does not fix problem, suspect BCM/input module fault. Verify with wiring diagrams, check for proper pull-up reference, and consult manufacturer procedures before module replacement.
After repair, clear codes, cycle ignition and operate cargo door several times to confirm proper function and that code does not return.

Likely causes

Failed or contaminated cargo door switch
Damaged insulation where the signal wire contacts body/chassis
Corrosion or water ingress at switch connector
Pinched harness at hinge or door area
BCM input fault or internal short (verify last)

Fault status

⚠️ Status

B2239 — Rear Cargo Door Set Switch Circuit Short to Ground. Stored when BCM detects continuous ground on the cargo door switch input or a switch mechanically stuck closed.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours