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Home / DTC / B2980 — Body Control Module Communication Fault

B2980 — Body Control Module Communication Fault

Detailed page for trouble code B2980.

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B2980

Generic B — Body

Body Control Module Communication Fault

Brand: Generic
Type: B — Body
Views: UK: 0 EN: 3 RU: 2
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Page language: EN

Causes

  • Poor BCM power supply or missing battery voltage (fuses, fusible links, ignition feed)
  • Poor ground connection at BCM or chassis ground
  • Corroded, loose, or damaged BCM connectors or wiring harness
  • Short or open on vehicle network (CAN/LIN) wiring
  • Faulty termination resistor or incorrect bus termination
  • Intermittent connection or physical damage (water intrusion, rodent damage)

Symptoms

  • Multiple body functions inoperative or intermittent (lighting, door locks, wipers, windows)
  • Warning lights or communication/inoperative messages on dash
  • Other modules showing communication errors or reduced functionality
  • Vehicle may enter failsafe or limited functionality modes
  • Modules may not appear or respond to scan tool

What to check

  • Connect a factory-level or professional scan tool; read all stored and pending codes across networks and check BCM status
  • Verify battery voltage and key-on power feeds to BCM (measure at module connector)
  • Check and wiggle test BCM ground(s) for secure and low-resistance connection to chassis
  • Visually inspect BCM connectors and harness for corrosion, bent pins, water intrusion, or physical damage
  • Check fuses and fusible links related to BCM power circuits
  • Measure CAN_H and CAN_L (or LIN) voltages at BCM with key on; compare to expected values

Signal parameters

  • CAN bus idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (each w.r.t. chassis)
  • CAN bus dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (typical values; vehicle-specific may vary)
  • Differential voltage (CAN_H - CAN_L) should switch between ~0 V (recessive) and ~2 V (dominant)
  • Bus termination: typical measured resistance between CAN_H and CAN_L ≈ 60 Ω with key off (two 120 Ω terminators in parallel)
  • Typical CAN network data rates: 125 kbps, 250 kbps, 500 kbps (confirm vehicle-specific)
  • LIN bus idle: single-wire nominal voltage ≈ battery/2 through pull-up; check vehicle-specific parameters

Diagnostic algorithm

  1. Retrieve all DTCs from BCM and other modules; note freeze frame and the time the code set.
  2. Verify battery state-of-charge and voltage stability; ensure ignition in correct position for tests.
  3. Inspect BCM power and ground circuits: check related fuses, measure voltage at module pins, and verify ground continuity to chassis.
  4. Visually inspect BCM connector and harness for damage, moisture, or corrosion; repair any obvious faults.
  5. With a scan tool, monitor network messages and perform a module present/heartbeat check. Note if BCM appears and how frequently it transmits.
  6. Measure CAN_H and CAN_L at the BCM with a DMM then with an oscilloscope while the network is active; look for proper idle voltages, proper differential swings, and absence of excessive noise or distortion.
  7. Measure termination resistance between CAN_H and CAN_L at the BCM connector with power off; verify approximately 60 Ω (vehicle-specific).
  8. If bus-off or error frames are observed, isolate by disconnecting non-critical modules one at a time while monitoring bus behavior to find the faulty node.
  9. Check for and remove any aftermarket devices or splices that may be loading the bus.
  10. If wiring and other modules check good, consult manufacturer service information for BCM reprogramming or software updates; perform reflash if indicated.
  11. Replace BCM only after confirming communications faults are not caused by external wiring, power/ground, or other modules. Re-initialize and reprogram new BCM per manufacturer procedures, then recheck networks and clear codes.

Likely causes

  • Loose/corroded BCM power or ground
  • Damaged or shorted CAN/LIN wiring at or near BCM
  • Failed or bus-off condition from another control module
  • Faulty BCM hardware or corrupted firmware

Fault status

⚠️ Status
BCM communication fault: module messages not received or bus errors detected on the vehicle network. Verify power/ground, wiring, and network integrity before replacing the module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0073 U0121 U0114 U0155
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