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Home / DTC / B1383 — Oil level warning lamp short to positive

B1383 — Oil level warning lamp short to positive

Detailed page for trouble code B1383.

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Code

B1383

FIAT B — Body

Oil level warning lamp short to positive

Brand: FIAT
Type: B — Body
Views: UK: 4 EN: 4 RU: 2
AI status
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Page language: EN

Causes

  • Damaged wiring or chafed insulation contacting battery positive or fused circuits
  • Short in connector (corrosion, pin pushed out) connecting lamp/sensor to instrument cluster or BCM
  • Faulty instrument cluster or body control module (internal short)
  • Aftermarket electrical accessories incorrectly connected to the circuit
  • Faulty oil level sensor with internal short to supply

Symptoms

  • Oil level warning lamp permanently lit, even when oil level is normal
  • Intermittent or sporadic lamp illumination
  • Possible other instrument cluster or body module lamp anomalies if module affected
  • Possible stored B1383 code and related body module errors

What to check

  • Read and record stored DTCs and freeze frame data with a compatible scan tool
  • Visual inspection of wiring harness, connectors and oil level sensor for damage or corrosion
  • Check fuses and relays related to instrument cluster / body control module
  • Back-probe the oil level lamp / sensor circuit and measure voltage with ignition ON
  • Unplug suspect connectors to see if fault disappears (isolate circuit segments)
  • Swap or test instrument cluster/BCM only if wiring and sensor verified good

Signal parameters

  • Normal (lamp OFF): circuit should be low impedance to ground or open depending on design; measured voltage typically ≈ 0–1 V (or open/0 V) at lamp feed when OFF
  • Fault (short to positive): measured voltage ≈ battery voltage (11–13.5 V) at lamp/sensor feed when it should be low
  • Continuity: with ignition OFF, expected infinite or high resistance between lamp circuit and battery positive; a low resistance indicates short
  • Sensor/resistance value (if applicable): oil level sensor resistance should change with oil level — consult vehicle-specific values

Diagnostic algorithm

  1. Retrieve and record DTC B1383 and any related codes using a compatible diagnostic tool. Note freeze-frame and current inputs.
  2. Perform a visual inspection of wiring and connectors from the oil level sensor/indicator lamp to the instrument cluster/BCM. Look for damaged insulation, pin corrosion, recent repair sites or adapters.
  3. With ignition ON (engine OFF), back-probe the oil level lamp/sensor connector and measure voltage. If voltage is battery positive (~12 V) when lamp should be OFF, verify presence of short to positive.
  4. Disconnect the oil level sensor/indicator connector. If the fault clears and voltage drops, suspect the sensor or harness downstream of the connector; if the fault remains, suspect upstream wiring or module.
  5. Isolate the circuit by disconnecting instrument cluster/BCM connector(s). If removing the module connector makes the voltage go away and the code clears, the module may be faulty or its harness shorted. If the short persists with module disconnected, the short is elsewhere in the harness.
  6. Perform continuity and resistance checks between the lamp circuit and battery positive with ignition OFF. Low resistance indicates a short; find and repair wiring abrasion or unwanted contact points.
  7. Inspect and clean connectors, repair damaged wires (cut out and solder/crimp with heat-shrink), and secure harnesses away from heat or moving parts.
  8. If wiring and connectors are confirmed good, test or replace the instrument cluster / body control module per manufacturer procedures. Re-flash or program replacement modules if required.
  9. After repair, clear codes and confirm lamp behavior over a test drive and with repeated ignition cycles to ensure the fault does not return.

Likely causes

  • Wiring short to B+ in harness between oil level sensor / lamp and instrument cluster
  • Corroded/loose connector at oil level sensor or cluster causing contact to positive
  • Instrument cluster/BCM output stage failed shorted to battery
  • Recent repair or modification that disturbed wiring near the engine bay or dash

Fault status

⚠️ Status
Oil level warning lamp circuit — short to positive detected (B1383). Lamp may be permanently lit or behave incorrectly. Inspection of sensor, wiring and instrument cluster/body module recommended.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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B1380 B1381 B1382 B1384 U0121
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