Code
B1385
ALFA ROMEO
B — Body
Oil level warning lamp circuit
Views:
UK: 4
EN: 3
RU: 2
AI status
Completed
Completed
100%
Causes
- Blown/poor fuse protecting instrument cluster or lamp circuit
- Loose, corroded or disconnected connector at oil level sensor, instrument cluster or BCM
- Open or shorted wiring between oil level sensor and instrument cluster/BCM
- Failed oil level sensor (float or electronic sensor)
- Faulty instrument cluster or BCM (lamp driver/input circuit)
- Software/configuration error or intermittent CAN/serial communications fault
Symptoms
- Oil level warning lamp illuminated permanently or intermittently
- No illumination when ignition on (lamp does not self-test)
- False low-oil warnings or lamp failure to illuminate when oil is low
- Possible related message on cluster (oil level/error) or logged DTCs
What to check
- Read stored freeze frame and auxiliary codes with OBD-II scanner; clear and re-scan to confirm persistence
- Visual inspection of fuses related to instrument cluster/BCM and oil level sensor
- Visually inspect connectors and wiring at oil level sensor, instrument cluster and BCM for corrosion, looseness or damage
- Operate lamp self-test (ignition ON) and observe behavior
- Measure continuity and resistance of wiring between sensor and cluster/BCM
- Check for related CAN or communication codes that may affect cluster operation
Signal parameters
- Battery supply to cluster/lamp: ~12 V (key ON) — verify presence at fuse or connector
- Instrument cluster lamp driver output: switched to ground or switched 12 V depending on design — confirm using wiring diagram
- Typical float-type oil level switch: closed (low oil) = near 0–5 Ω; open (normal oil) = very high resistance/OL. Electronic sensors may present a voltage or CAN/serial message instead
- If sensor communicates digitally: CAN bus idle voltages ~2.5 V on CAN High/Low (verify with wiring diagram before diagnosing)
- Shorts to battery or ground will show near 0 Ω to the respective rail; open circuits will show infinite resistance
Diagnostic algorithm
- Retrieve all related DTCs and freeze-frame data. Record and clear codes, then attempt to reproduce.
- Perform visual inspection: fuses, connectors, wiring harness routing near engine and chassis. Repair any obvious damage.
- With ignition ON (engine off), verify oil warning lamp self-test illuminates. Note lamp behavior (no light, dim, stuck on).
- Locate oil level sensor connector. With connector disconnected, measure resistance across sensor terminals and compare to expected open/closed behavior per vehicle wiring diagram. Replace sensor if readings are out of expected range.
- Backprobe the sensor wiring with ignition ON: check for reference voltage or switch continuity to ground when sensor is actuated (manually operate float if accessible).
- Check for supply voltage and ground at the instrument cluster lamp connector / BCM input. If supply absent, trace to fuse and repair.
- Perform continuity check between sensor connector and cluster/BCM pins to confirm wiring integrity. Repair any opens or high-resistance sections.
- If wiring and sensor are good, test cluster/BCM input pin functionality: monitor signal with oscilloscope or DMM while actuating sensor. If input is not changing, suspect cluster/BCM driver fault.
- Inspect for software updates or TSBs that address oil level/cluster faults; reprogram module if manufacturer procedure indicates.
- After repairs, clear codes, perform functional test (simulate low oil if safe/allowed or use test mode), and road test or cycle ignition to verify fault does not return.
Likely causes
- Damaged/loose connector or wiring to oil level sensor or instrument cluster
- Failed oil level sensor (most common if wiring visually intact)
- Faulty cluster lamp driver or BCM input
- Blown fuse (quick to check but less frequent cause)
Fault status
Status
Oil level warning lamp circuit malfunction recorded. The instrument cluster/BCM detected an abnormal signal in the oil level/warning lamp circuit (open/short/communication fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1385
FIAT
B — Body
Oil level warning lamp circuit
Views:
UK: 3
EN: 4
RU: 3
AI status
Completed
Completed
100%
Causes
- Blown/poor fuse protecting instrument cluster or lamp circuit
- Loose, corroded or disconnected connector at oil level sensor, instrument cluster or BCM
- Open or shorted wiring between oil level sensor and instrument cluster/BCM
- Failed oil level sensor (float or electronic sensor)
- Faulty instrument cluster or BCM (lamp driver/input circuit)
- Software/configuration error or intermittent CAN/serial communications fault
Symptoms
- Oil level warning lamp illuminated permanently or intermittently
- No illumination when ignition on (lamp does not self-test)
- False low-oil warnings or lamp failure to illuminate when oil is low
- Possible related message on cluster (oil level/error) or logged DTCs
What to check
- Read stored freeze frame and auxiliary codes with OBD-II scanner; clear and re-scan to confirm persistence
- Visual inspection of fuses related to instrument cluster/BCM and oil level sensor
- Visually inspect connectors and wiring at oil level sensor, instrument cluster and BCM for corrosion, looseness or damage
- Operate lamp self-test (ignition ON) and observe behavior
- Measure continuity and resistance of wiring between sensor and cluster/BCM
- Check for related CAN or communication codes that may affect cluster operation
Signal parameters
- Battery supply to cluster/lamp: ~12 V (key ON) — verify presence at fuse or connector
- Instrument cluster lamp driver output: switched to ground or switched 12 V depending on design — confirm using wiring diagram
- Typical float-type oil level switch: closed (low oil) = near 0–5 Ω; open (normal oil) = very high resistance/OL. Electronic sensors may present a voltage or CAN/serial message instead
- If sensor communicates digitally: CAN bus idle voltages ~2.5 V on CAN High/Low (verify with wiring diagram before diagnosing)
- Shorts to battery or ground will show near 0 Ω to the respective rail; open circuits will show infinite resistance
Diagnostic algorithm
- Retrieve all related DTCs and freeze-frame data. Record and clear codes, then attempt to reproduce.
- Perform visual inspection: fuses, connectors, wiring harness routing near engine and chassis. Repair any obvious damage.
- With ignition ON (engine off), verify oil warning lamp self-test illuminates. Note lamp behavior (no light, dim, stuck on).
- Locate oil level sensor connector. With connector disconnected, measure resistance across sensor terminals and compare to expected open/closed behavior per vehicle wiring diagram. Replace sensor if readings are out of expected range.
- Backprobe the sensor wiring with ignition ON: check for reference voltage or switch continuity to ground when sensor is actuated (manually operate float if accessible).
- Check for supply voltage and ground at the instrument cluster lamp connector / BCM input. If supply absent, trace to fuse and repair.
- Perform continuity check between sensor connector and cluster/BCM pins to confirm wiring integrity. Repair any opens or high-resistance sections.
- If wiring and sensor are good, test cluster/BCM input pin functionality: monitor signal with oscilloscope or DMM while actuating sensor. If input is not changing, suspect cluster/BCM driver fault.
- Inspect for software updates or TSBs that address oil level/cluster faults; reprogram module if manufacturer procedure indicates.
- After repairs, clear codes, perform functional test (simulate low oil if safe/allowed or use test mode), and road test or cycle ignition to verify fault does not return.
Likely causes
- Damaged/loose connector or wiring to oil level sensor or instrument cluster
- Failed oil level sensor (most common if wiring visually intact)
- Faulty cluster lamp driver or BCM input
- Blown fuse (quick to check but less frequent cause)
Fault status
Status
Oil level warning lamp circuit malfunction recorded. The instrument cluster/BCM detected an abnormal signal in the oil level/warning lamp circuit (open/short/communication fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1385
OPEL
B — Body
Terminal 15A Circuit Malfunction
Views:
UK: 5
EN: 6
RU: 4
AI status
Completed
Completed
100%
Causes
- Blown/poor fuse protecting instrument cluster or lamp circuit
- Loose, corroded or disconnected connector at oil level sensor, instrument cluster or BCM
- Open or shorted wiring between oil level sensor and instrument cluster/BCM
- Failed oil level sensor (float or electronic sensor)
- Faulty instrument cluster or BCM (lamp driver/input circuit)
- Software/configuration error or intermittent CAN/serial communications fault
Symptoms
- Oil level warning lamp illuminated permanently or intermittently
- No illumination when ignition on (lamp does not self-test)
- False low-oil warnings or lamp failure to illuminate when oil is low
- Possible related message on cluster (oil level/error) or logged DTCs
What to check
- Read stored freeze frame and auxiliary codes with OBD-II scanner; clear and re-scan to confirm persistence
- Visual inspection of fuses related to instrument cluster/BCM and oil level sensor
- Visually inspect connectors and wiring at oil level sensor, instrument cluster and BCM for corrosion, looseness or damage
- Operate lamp self-test (ignition ON) and observe behavior
- Measure continuity and resistance of wiring between sensor and cluster/BCM
- Check for related CAN or communication codes that may affect cluster operation
Signal parameters
- Battery supply to cluster/lamp: ~12 V (key ON) — verify presence at fuse or connector
- Instrument cluster lamp driver output: switched to ground or switched 12 V depending on design — confirm using wiring diagram
- Typical float-type oil level switch: closed (low oil) = near 0–5 Ω; open (normal oil) = very high resistance/OL. Electronic sensors may present a voltage or CAN/serial message instead
- If sensor communicates digitally: CAN bus idle voltages ~2.5 V on CAN High/Low (verify with wiring diagram before diagnosing)
- Shorts to battery or ground will show near 0 Ω to the respective rail; open circuits will show infinite resistance
Diagnostic algorithm
- Retrieve all related DTCs and freeze-frame data. Record and clear codes, then attempt to reproduce.
- Perform visual inspection: fuses, connectors, wiring harness routing near engine and chassis. Repair any obvious damage.
- With ignition ON (engine off), verify oil warning lamp self-test illuminates. Note lamp behavior (no light, dim, stuck on).
- Locate oil level sensor connector. With connector disconnected, measure resistance across sensor terminals and compare to expected open/closed behavior per vehicle wiring diagram. Replace sensor if readings are out of expected range.
- Backprobe the sensor wiring with ignition ON: check for reference voltage or switch continuity to ground when sensor is actuated (manually operate float if accessible).
- Check for supply voltage and ground at the instrument cluster lamp connector / BCM input. If supply absent, trace to fuse and repair.
- Perform continuity check between sensor connector and cluster/BCM pins to confirm wiring integrity. Repair any opens or high-resistance sections.
- If wiring and sensor are good, test cluster/BCM input pin functionality: monitor signal with oscilloscope or DMM while actuating sensor. If input is not changing, suspect cluster/BCM driver fault.
- Inspect for software updates or TSBs that address oil level/cluster faults; reprogram module if manufacturer procedure indicates.
- After repairs, clear codes, perform functional test (simulate low oil if safe/allowed or use test mode), and road test or cycle ignition to verify fault does not return.
Likely causes
- Damaged/loose connector or wiring to oil level sensor or instrument cluster
- Failed oil level sensor (most common if wiring visually intact)
- Faulty cluster lamp driver or BCM input
- Blown fuse (quick to check but less frequent cause)
Fault status
Status
Oil level warning lamp circuit malfunction recorded. The instrument cluster/BCM detected an abnormal signal in the oil level/warning lamp circuit (open/short/communication fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Send to email
Code
B1385
Other
B — Body
Oil Level Lamp Circuit Open
Views:
UK: 13
EN: 18
RU: 17
AI status
Completed
Completed
100%
Causes
- Blown/poor fuse protecting instrument cluster or lamp circuit
- Loose, corroded or disconnected connector at oil level sensor, instrument cluster or BCM
- Open or shorted wiring between oil level sensor and instrument cluster/BCM
- Failed oil level sensor (float or electronic sensor)
- Faulty instrument cluster or BCM (lamp driver/input circuit)
- Software/configuration error or intermittent CAN/serial communications fault
Symptoms
- Oil level warning lamp illuminated permanently or intermittently
- No illumination when ignition on (lamp does not self-test)
- False low-oil warnings or lamp failure to illuminate when oil is low
- Possible related message on cluster (oil level/error) or logged DTCs
What to check
- Read stored freeze frame and auxiliary codes with OBD-II scanner; clear and re-scan to confirm persistence
- Visual inspection of fuses related to instrument cluster/BCM and oil level sensor
- Visually inspect connectors and wiring at oil level sensor, instrument cluster and BCM for corrosion, looseness or damage
- Operate lamp self-test (ignition ON) and observe behavior
- Measure continuity and resistance of wiring between sensor and cluster/BCM
- Check for related CAN or communication codes that may affect cluster operation
Signal parameters
- Battery supply to cluster/lamp: ~12 V (key ON) — verify presence at fuse or connector
- Instrument cluster lamp driver output: switched to ground or switched 12 V depending on design — confirm using wiring diagram
- Typical float-type oil level switch: closed (low oil) = near 0–5 Ω; open (normal oil) = very high resistance/OL. Electronic sensors may present a voltage or CAN/serial message instead
- If sensor communicates digitally: CAN bus idle voltages ~2.5 V on CAN High/Low (verify with wiring diagram before diagnosing)
- Shorts to battery or ground will show near 0 Ω to the respective rail; open circuits will show infinite resistance
Diagnostic algorithm
- Retrieve all related DTCs and freeze-frame data. Record and clear codes, then attempt to reproduce.
- Perform visual inspection: fuses, connectors, wiring harness routing near engine and chassis. Repair any obvious damage.
- With ignition ON (engine off), verify oil warning lamp self-test illuminates. Note lamp behavior (no light, dim, stuck on).
- Locate oil level sensor connector. With connector disconnected, measure resistance across sensor terminals and compare to expected open/closed behavior per vehicle wiring diagram. Replace sensor if readings are out of expected range.
- Backprobe the sensor wiring with ignition ON: check for reference voltage or switch continuity to ground when sensor is actuated (manually operate float if accessible).
- Check for supply voltage and ground at the instrument cluster lamp connector / BCM input. If supply absent, trace to fuse and repair.
- Perform continuity check between sensor connector and cluster/BCM pins to confirm wiring integrity. Repair any opens or high-resistance sections.
- If wiring and sensor are good, test cluster/BCM input pin functionality: monitor signal with oscilloscope or DMM while actuating sensor. If input is not changing, suspect cluster/BCM driver fault.
- Inspect for software updates or TSBs that address oil level/cluster faults; reprogram module if manufacturer procedure indicates.
- After repairs, clear codes, perform functional test (simulate low oil if safe/allowed or use test mode), and road test or cycle ignition to verify fault does not return.
Likely causes
- Damaged/loose connector or wiring to oil level sensor or instrument cluster
- Failed oil level sensor (most common if wiring visually intact)
- Faulty cluster lamp driver or BCM input
- Blown fuse (quick to check but less frequent cause)
Fault status
Status
Oil level warning lamp circuit malfunction recorded. The instrument cluster/BCM detected an abnormal signal in the oil level/warning lamp circuit (open/short/communication fault).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Was this AI description helpful?
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