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Home / DTC / B1425 — Activated charcoal filler actuator (A32m2) closed

B1425 — Activated charcoal filler actuator (A32m2) closed

Detailed page for trouble code B1425.

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Code

B1425

MERCEDES-BENZ B — Body

Activated charcoal filler actuator (A32m2) closed

Brand: MERCEDES-BENZ
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Actuator mechanically stuck (corrosion, contamination, broken linkage)
  • Actuator motor or internal switch failure
  • Wiring fault (open, short to ground, short to battery, poor connector)
  • Faulty control module output or software error
  • Blocked or kinked EVAP hoses or filler neck preventing movement
  • Failed position sensor or limit switch inside the actuator

Symptoms

  • Malfunction indicator lamp (MIL) or warning message
  • Refueling difficulty or slow fill (tap-back on nozzle)
  • Fuel odor near filler area
  • EVAP system fault codes or reduced EVAP function
  • Possible inability to seal/vent fuel tank properly

What to check

  • Read and record DTCs and freeze frame with a diagnostic scanner; clear and retest
  • Perform an active test (command actuator open/close) while observing movement
  • Visually inspect actuator, linkage, hoses and connector for damage, corrosion or contamination
  • Check connector pins for corrosion, bent pins, moisture or poor contact
  • Measure supply voltage and ground at the actuator connector while commanding
  • Measure actuator coil resistance and compare with OEM specification

Signal parameters

  • Supply voltage at actuator: approx. battery voltage (11–14 V) when commanded
  • Control signal: switched ground or switched 12 V depending on architecture (verify with scan tool)
  • Actuator coil resistance: typically low ohms (refer to manufacturer spec); significant deviation suggests fault
  • Current draw during operation: small motor or solenoid range (tens to a few hundred mA); very high or zero current indicates problem
  • Position feedback (if present): open/closed switch or position signal should change when commanded

Diagnostic algorithm

  1. Connect a capable OBD scanner, read codes and attempt an active test to open/close the filler actuator while observing movement and live data.
  2. Visually inspect the actuator, linkage and EVAP hoses for obstruction, foreign material or mechanical damage. Remove contaminants if found.
  3. With ignition on, probe the actuator connector: verify battery voltage and ground presence while commanding the actuator. Note whether the control module changes the output when commanded.
  4. Measure actuator coil resistance with connector disconnected. Compare to manufacturer spec; replace if open or out-of-range.
  5. If actuator receives proper voltage but does not move, remove and bench-test the actuator (apply correct voltage/ground and observe operation). Replace if it fails bench test.
  6. If actuator does not receive proper control signal, trace wiring back to control module: check for continuity, shorts to ground/battery and connector integrity. Repair wiring as needed.
  7. If wiring and actuator are good but control signal is absent or incorrect, inspect related fuses/relays and consider control module software or module fault — consult manufacturer service info for module tests and updates.
  8. After repair, clear DTCs and perform functional/drive cycle verification; re-run smoke test if EVAP leaks suspected and verify proper fill/refuel behavior.

Likely causes

  • Corroded/contaminated actuator or linkage preventing movement
  • Damaged connector or wiring harness to the actuator
  • Failed actuator motor or internal position switch
  • Control module failed to drive actuator (less common)

Fault status

⚠️ Status
Activated charcoal filler actuator (A32m2) closed — control module reports closed position or no open response when commanded; possible actuator stuck, wiring or control fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0440 P0441 P0442 P0443 P0455
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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