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Home / DTC / B2835 — Body Control Module Internal Communication Fault

B2835 — Body Control Module Internal Communication Fault

Detailed page for trouble code B2835.

34,405codes
59brands
11,914generic
22,491specific
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Code

B2835

Generic B — Body

Body Control Module Internal Communication Fault

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

Causes

  • Low or intermittent battery voltage
  • Blown fuse(s) powering the BCM
  • Loose, corroded or damaged BCM connector(s) or harness
  • Poor or open ground(s) for BCM
  • Physical damage or water intrusion into BCM
  • Faulty CAN/LIN transceiver or BCM internal electronics

Symptoms

  • Intermittent or complete loss of BCM functions (door locks, lights, wipers, interior lights, etc.)
  • No response from key fob or remote functions
  • Instrument cluster or other modules display communication warnings
  • Unable to communicate with BCM using a scan tool or slow/erratic responses
  • Random or multiple body-system faults set
  • Certain functions operate only intermittently or after multiple cycles

What to check

  • Connect a scan tool and attempt to read BCM — note communication status and freeze frame data
  • Record battery voltage with key off, key on and during crank; confirm within manufacturer spec (typically 12–14.5 V)
  • Visually inspect BCM and connectors for corrosion, water damage, burnt pins or loose terminals
  • Inspect fuses and fusible links that feed the BCM; test continuity and voltage at fuse locations
  • Check BCM ground(s) for continuity to battery negative and for corrosion/tightness
  • Inspect CAN and LIN physical layer: check continuity, shorts to power/ground, and damaged wiring from BCM to network

Signal parameters

  • Battery voltage (key off, key on, startup)
  • BCM supply voltage at module pin (Vbat)
  • BCM ground continuity (ohms to battery negative)
  • CAN bus idle voltage (both CAN_H and CAN_L)
  • CAN bus dominant/recessive voltage swing and timing (use scope or CAN analyzer)
  • CAN error counters or bus-off status from scan tool

Diagnostic algorithm

  1. Retrieve and record all DTCs from BCM and other modules; save freeze-frame and any relevant data. 2) Verify battery condition and charging system; correct low-voltage issues before further diagnosis. 3) Visually inspect BCM, harness and connectors for damage, corrosion, moisture; repair as needed. 4) Check fuses and measure supply voltage at the BCM power pins with key ON; repair faults. 5) Verify ground(s) at BCM for tightness and low resistance to battery negative. 6) Using a scan tool, check if the BCM is communicative; if intermittent, attempt repeated connections and note patterns. 7) Check physical layer of CAN/LIN: measure idle voltages, perform bus load and short tests, and use a scope/CAN analyzer to look for error frames or bus-off conditions. 8) Isolate by disconnecting other modules or peripherals (where safe) to see if the network recovers. 9) If wiring and network tests are good but communication fails, consider reflashing/configuring BCM per OEM procedure; perform any available software updates. 10) If module still fails communication after wiring, power/ground and software verified, consider replacing the BCM and programming it to the vehicle. 11) After repair, clear codes and verify all systems and message traffic return to normal; road test to confirm intermittent issues resolved.

Likely causes

  • Battery voltage below specification during key on or engine cranking
  • BCM supply fuse blown or high resistance in the supply circuit
  • Open or high-resistance ground at BCM chassis ground stud
  • Damaged wiring at door harness, junction blocks or splice packs affecting CAN/LIN signals
  • Water intrusion or corrosion inside BCM connector
  • Failed BCM transceiver or internal processor fault

Fault status

⚠️ Status
BCM internal communication fault — module reports loss of or degraded communication on vehicle network or internal communications error.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

B2835

HYUNDAI B — Body

DVDP DECK Connection Error

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

Causes

  • Low or intermittent battery voltage
  • Blown fuse(s) powering the BCM
  • Loose, corroded or damaged BCM connector(s) or harness
  • Poor or open ground(s) for BCM
  • Physical damage or water intrusion into BCM
  • Faulty CAN/LIN transceiver or BCM internal electronics

Symptoms

  • Intermittent or complete loss of BCM functions (door locks, lights, wipers, interior lights, etc.)
  • No response from key fob or remote functions
  • Instrument cluster or other modules display communication warnings
  • Unable to communicate with BCM using a scan tool or slow/erratic responses
  • Random or multiple body-system faults set
  • Certain functions operate only intermittently or after multiple cycles

What to check

  • Connect a scan tool and attempt to read BCM — note communication status and freeze frame data
  • Record battery voltage with key off, key on and during crank; confirm within manufacturer spec (typically 12–14.5 V)
  • Visually inspect BCM and connectors for corrosion, water damage, burnt pins or loose terminals
  • Inspect fuses and fusible links that feed the BCM; test continuity and voltage at fuse locations
  • Check BCM ground(s) for continuity to battery negative and for corrosion/tightness
  • Inspect CAN and LIN physical layer: check continuity, shorts to power/ground, and damaged wiring from BCM to network

Signal parameters

  • Battery voltage (key off, key on, startup)
  • BCM supply voltage at module pin (Vbat)
  • BCM ground continuity (ohms to battery negative)
  • CAN bus idle voltage (both CAN_H and CAN_L)
  • CAN bus dominant/recessive voltage swing and timing (use scope or CAN analyzer)
  • CAN error counters or bus-off status from scan tool

Diagnostic algorithm

  1. Retrieve and record all DTCs from BCM and other modules; save freeze-frame and any relevant data. 2) Verify battery condition and charging system; correct low-voltage issues before further diagnosis. 3) Visually inspect BCM, harness and connectors for damage, corrosion, moisture; repair as needed. 4) Check fuses and measure supply voltage at the BCM power pins with key ON; repair faults. 5) Verify ground(s) at BCM for tightness and low resistance to battery negative. 6) Using a scan tool, check if the BCM is communicative; if intermittent, attempt repeated connections and note patterns. 7) Check physical layer of CAN/LIN: measure idle voltages, perform bus load and short tests, and use a scope/CAN analyzer to look for error frames or bus-off conditions. 8) Isolate by disconnecting other modules or peripherals (where safe) to see if the network recovers. 9) If wiring and network tests are good but communication fails, consider reflashing/configuring BCM per OEM procedure; perform any available software updates. 10) If module still fails communication after wiring, power/ground and software verified, consider replacing the BCM and programming it to the vehicle. 11) After repair, clear codes and verify all systems and message traffic return to normal; road test to confirm intermittent issues resolved.

Likely causes

  • Battery voltage below specification during key on or engine cranking
  • BCM supply fuse blown or high resistance in the supply circuit
  • Open or high-resistance ground at BCM chassis ground stud
  • Damaged wiring at door harness, junction blocks or splice packs affecting CAN/LIN signals
  • Water intrusion or corrosion inside BCM connector
  • Failed BCM transceiver or internal processor fault

Fault status

⚠️ Status
BCM internal communication fault — module reports loss of or degraded communication on vehicle network or internal communications error.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2830 B2831 B2836 U0073 U0100 U1000
371

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

HYUNDAI

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Code

B2835

LAND ROVER B — Body

Body Control Module internal communication fault

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

Causes

  • Low or intermittent battery voltage
  • Blown fuse(s) powering the BCM
  • Loose, corroded or damaged BCM connector(s) or harness
  • Poor or open ground(s) for BCM
  • Physical damage or water intrusion into BCM
  • Faulty CAN/LIN transceiver or BCM internal electronics

Symptoms

  • Intermittent or complete loss of BCM functions (door locks, lights, wipers, interior lights, etc.)
  • No response from key fob or remote functions
  • Instrument cluster or other modules display communication warnings
  • Unable to communicate with BCM using a scan tool or slow/erratic responses
  • Random or multiple body-system faults set
  • Certain functions operate only intermittently or after multiple cycles

What to check

  • Connect a scan tool and attempt to read BCM — note communication status and freeze frame data
  • Record battery voltage with key off, key on and during crank; confirm within manufacturer spec (typically 12–14.5 V)
  • Visually inspect BCM and connectors for corrosion, water damage, burnt pins or loose terminals
  • Inspect fuses and fusible links that feed the BCM; test continuity and voltage at fuse locations
  • Check BCM ground(s) for continuity to battery negative and for corrosion/tightness
  • Inspect CAN and LIN physical layer: check continuity, shorts to power/ground, and damaged wiring from BCM to network

Signal parameters

  • Battery voltage (key off, key on, startup)
  • BCM supply voltage at module pin (Vbat)
  • BCM ground continuity (ohms to battery negative)
  • CAN bus idle voltage (both CAN_H and CAN_L)
  • CAN bus dominant/recessive voltage swing and timing (use scope or CAN analyzer)
  • CAN error counters or bus-off status from scan tool

Diagnostic algorithm

  1. Retrieve and record all DTCs from BCM and other modules; save freeze-frame and any relevant data. 2) Verify battery condition and charging system; correct low-voltage issues before further diagnosis. 3) Visually inspect BCM, harness and connectors for damage, corrosion, moisture; repair as needed. 4) Check fuses and measure supply voltage at the BCM power pins with key ON; repair faults. 5) Verify ground(s) at BCM for tightness and low resistance to battery negative. 6) Using a scan tool, check if the BCM is communicative; if intermittent, attempt repeated connections and note patterns. 7) Check physical layer of CAN/LIN: measure idle voltages, perform bus load and short tests, and use a scope/CAN analyzer to look for error frames or bus-off conditions. 8) Isolate by disconnecting other modules or peripherals (where safe) to see if the network recovers. 9) If wiring and network tests are good but communication fails, consider reflashing/configuring BCM per OEM procedure; perform any available software updates. 10) If module still fails communication after wiring, power/ground and software verified, consider replacing the BCM and programming it to the vehicle. 11) After repair, clear codes and verify all systems and message traffic return to normal; road test to confirm intermittent issues resolved.

Likely causes

  • Battery voltage below specification during key on or engine cranking
  • BCM supply fuse blown or high resistance in the supply circuit
  • Open or high-resistance ground at BCM chassis ground stud
  • Damaged wiring at door harness, junction blocks or splice packs affecting CAN/LIN signals
  • Water intrusion or corrosion inside BCM connector
  • Failed BCM transceiver or internal processor fault

Fault status

⚠️ Status
BCM internal communication fault — module reports loss of or degraded communication on vehicle network or internal communications error.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2830 B2831 B2836 U0073 U0100 U1000
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B2835

MITSUBISHI B — Body

ECU internal (EEPROM)

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

Causes

  • Low or intermittent battery voltage
  • Blown fuse(s) powering the BCM
  • Loose, corroded or damaged BCM connector(s) or harness
  • Poor or open ground(s) for BCM
  • Physical damage or water intrusion into BCM
  • Faulty CAN/LIN transceiver or BCM internal electronics

Symptoms

  • Intermittent or complete loss of BCM functions (door locks, lights, wipers, interior lights, etc.)
  • No response from key fob or remote functions
  • Instrument cluster or other modules display communication warnings
  • Unable to communicate with BCM using a scan tool or slow/erratic responses
  • Random or multiple body-system faults set
  • Certain functions operate only intermittently or after multiple cycles

What to check

  • Connect a scan tool and attempt to read BCM — note communication status and freeze frame data
  • Record battery voltage with key off, key on and during crank; confirm within manufacturer spec (typically 12–14.5 V)
  • Visually inspect BCM and connectors for corrosion, water damage, burnt pins or loose terminals
  • Inspect fuses and fusible links that feed the BCM; test continuity and voltage at fuse locations
  • Check BCM ground(s) for continuity to battery negative and for corrosion/tightness
  • Inspect CAN and LIN physical layer: check continuity, shorts to power/ground, and damaged wiring from BCM to network

Signal parameters

  • Battery voltage (key off, key on, startup)
  • BCM supply voltage at module pin (Vbat)
  • BCM ground continuity (ohms to battery negative)
  • CAN bus idle voltage (both CAN_H and CAN_L)
  • CAN bus dominant/recessive voltage swing and timing (use scope or CAN analyzer)
  • CAN error counters or bus-off status from scan tool

Diagnostic algorithm

  1. Retrieve and record all DTCs from BCM and other modules; save freeze-frame and any relevant data. 2) Verify battery condition and charging system; correct low-voltage issues before further diagnosis. 3) Visually inspect BCM, harness and connectors for damage, corrosion, moisture; repair as needed. 4) Check fuses and measure supply voltage at the BCM power pins with key ON; repair faults. 5) Verify ground(s) at BCM for tightness and low resistance to battery negative. 6) Using a scan tool, check if the BCM is communicative; if intermittent, attempt repeated connections and note patterns. 7) Check physical layer of CAN/LIN: measure idle voltages, perform bus load and short tests, and use a scope/CAN analyzer to look for error frames or bus-off conditions. 8) Isolate by disconnecting other modules or peripherals (where safe) to see if the network recovers. 9) If wiring and network tests are good but communication fails, consider reflashing/configuring BCM per OEM procedure; perform any available software updates. 10) If module still fails communication after wiring, power/ground and software verified, consider replacing the BCM and programming it to the vehicle. 11) After repair, clear codes and verify all systems and message traffic return to normal; road test to confirm intermittent issues resolved.

Likely causes

  • Battery voltage below specification during key on or engine cranking
  • BCM supply fuse blown or high resistance in the supply circuit
  • Open or high-resistance ground at BCM chassis ground stud
  • Damaged wiring at door harness, junction blocks or splice packs affecting CAN/LIN signals
  • Water intrusion or corrosion inside BCM connector
  • Failed BCM transceiver or internal processor fault

Fault status

⚠️ Status
BCM internal communication fault — module reports loss of or degraded communication on vehicle network or internal communications error.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2830 B2831 B2836 U0073 U0100 U1000
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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