B2261

Code

Generic B — Body

Driver Door Module Communication Fault

Brand: Generic

Type: B — Body

Views: UK: 12 EN: 29 RU: 14

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Loss of power or ground to the driver door module
Open/short or high-resistance wiring in the communication bus (CAN/LIN/K-Line)
Corroded or loose connector pins at the DDM or junctions
Blown fuse or poor fuse contact feeding the DDM
Faulty driver door module (internal failure)
Network termination resistor missing or shorted

Symptoms

Driver door functions fail or work intermittently (power windows, mirror adjust, door lock/unlock)
Scan tool cannot communicate with the driver door module or shows module not present
Multiple network communication DTCs reported (other modules show bus errors)
Dome/lighting or related convenience features affected on that door
Intermittent faults that change when door is moved or during vibration

What to check

Scan tool: verify B2261 is current or stored; note freeze frame and related codes
Check vehicle fuses and relays supplying the DDM
Visually inspect DDM connectors and door-harness routing at hinges for damage or corrosion
Measure battery voltage at DDM power pin with ignition on
Verify ground(s) for the DDM with continuity and voltage drop tests
Check communication bus voltages (CAN/LIN) at the DDM with meter or scope

Signal parameters

DDM supply voltage (ignition on): ~11–14.5 V at the module power pin
Module ground: low resistance to chassis, voltage drop
CAN bus idle: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (approximate); dominant state typically CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
LIN/K-line idle: near battery voltage; active communications pull line toward 0 V (single-wire behavior)
Open/short indicators: open bus may show stuck high/low or varying levels; short to battery or ground will pull line out of expected ranges

Diagnostic algorithm

Confirm the code and note any related communication or module codes with a capable scan tool.
Attempt to communicate with the DDM via the scan tool. If the DDM is completely absent, proceed to power/ground checks.
Check fuses/relays and verify battery voltage at the DDM power pin with connector connected and ignition on.
Verify ground(s) by measuring voltage drop while actuating a load or using an ohmmeter to vehicle chassis; repair poor ground connections.
Visually inspect connectors and wiring at the DDM and through the door hinge area for chafing, corrosion, or breaks; repair as required.
Check communication lines at the DDM with a multimeter or oscilloscope for expected idle voltages and activity. Look for shorts to battery/ground or open circuits.
Wiggle the door harness while watching bus activity and module presence on the scan tool to find intermittent faults.
If wiring and power/grounds are good and network signals are healthy but no module response, check for software/flash updates or module configuration mismatch; reprogram or update as manufacturer directed.
Replace the DDM only after verifying external wiring, power, grounds, and network are correct. After replacement/programming, clear codes and perform functional test cycles and road/door cycles to confirm repair.
Re-scan for related codes and confirm no new communication faults.

Likely causes

Loose, corroded, or damaged connector at the driver door module
Power or ground missing at the DDM (blown fuse, bad splice, open ground)
Broken or shorted CAN/LIN wiring in door harness (common where harness flexes)
Failed DDM
Network-level fault (open/shorted bus or missing termination)

Fault status

⚠️ Status

Driver Door Module Communication Fault — module not responding or messages corrupted on the vehicle network (CAN/LIN). Verify power, ground, wiring and network integrity before replacing module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours