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Home / DTC / C1987 — Yellow warning indicator for short battery failure

C1987 — Yellow warning indicator for short battery failure

Detailed page for trouble code C1987.

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Code

C1987

LAND ROVER C — Chassis

Yellow warning indicator for short battery failure

Brand: LAND ROVER
Type: C — Chassis
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Page language: EN

Causes

  • Actual short circuit on 12V system (protected or unprotected circuit)
  • Severely discharged or failing 12V battery
  • Poor battery connections or corroded terminals
  • Faulty battery monitoring sensor or battery pack sensor (BMU/BMU strap)
  • Damaged positive cable, ground strap, or fusible link
  • Faulty charging system (alternator/voltage regulator)

Symptoms

  • Yellow battery warning lamp or yellow master warning illuminated
  • Reduced accessory or electrical function (intermittent lights, infotainment resets)
  • No-crank or slow-crank condition when starting
  • Stored or recurring electrical fault codes relating to system voltage or communications
  • Possible limp-home mode or limited vehicle functions until condition is cleared

What to check

  • Use a diagnostic scan tool to read current and historic DTCs, freeze frame and live data (vehicle voltage, SOC, battery sensor values)
  • Visually inspect battery, terminals, cables, ground straps, fusible links and battery sensor for corrosion, damage or loose connections
  • Measure battery open-circuit/resting voltage (with vehicle off, after waiting 30–60 minutes) — expected ~12.4–12.7 V for a healthy charged battery
  • Measure system voltage with engine running — expected charging 13.5–14.8 V
  • Perform a battery load or conductance test per manufacturer spec (CRanking performance and internal resistance)
  • Check continuity and resistance of battery positive/negative cables and main ground to chassis/engine

Signal parameters

  • Resting battery voltage: ~12.4–12.7 V (lower indicates discharged battery)
  • Charging voltage (engine running): ~13.5–14.8 V (below ~13.0 V suggests charging fault; above ~15.0 V suggests regulator overvoltage)
  • Cranking voltage drop: depends on battery/engine size — significant drop (
  • Typical parasitic draw asleep: usually
  • Battery sensor voltage/communication: confirm correct CAN/LIN values and expected sensor resistance per service data

Diagnostic algorithm

  1. Read and record C1987 and any other stored DTCs, note freeze-frame data and time stamps.
  2. Clear codes and attempt to reproduce the warning while monitoring battery voltage and battery sensor live data with a scan tool.
  3. Perform a full visual inspection of battery, terminals, battery sensor, battery hold-down, positive cable, ground strap(s) and fusible links. Tighten/clean terminals as needed.
  4. Measure open-circuit battery voltage after rest. If voltage is low, charge battery and re-test or perform a conductance/load test to assess health. Replace battery if it fails test.
  5. With a charged battery, start engine and measure charging system voltage. If charging voltage out of range, inspect alternator and regulator, and test alternator output and field circuit.
  6. If charging and battery test good, measure voltage drops across positive and negative battery cables (engine running and during crank) to find high-resistance connections.
  7. Perform a parasitic draw test with all modules asleep. Remove fuses sequentially to isolate the circuit causing excessive draw; inspect that circuit for shorts or stuck loads.
  8. Check continuity and insulation of harnesses in common failure areas (engine bay, firewall, near hood hinges). Repair damaged wiring or connectors.
  9. Verify battery sensor (if fitted) wiring and connector; test sensor per manufacturer procedure or replace if out of specification.
  10. If no electrical fault found, check BCM/JBE module for internal faults or communication errors. Reprogram or replace module only after ruling out wiring/battery/charging issues.
  11. After repairs, clear codes and perform a road test or soak test to confirm the warning does not return and that voltage parameters remain stable.

Likely causes

  • Battery voltage collapsed below expected threshold during key on/start (weak cell or bad connection)
  • Parasitic draw or direct short to ground on an accessory circuit
  • Battery negative/earth strap corrosion causing intermittent low voltage
  • Battery sensor reporting incorrect voltage/current values
  • Loose or damaged battery positive cable or fusible link

Fault status

⚠️ Status
Yellow battery warning indicator illuminated — suspected short/battery failure detected (C1987). Check battery, connections, charging system and related wiring; further diagnostics required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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