Code
B1377
ALFA ROMEO
B — Body
Oil change warning lamp circuit
Views:
UK: 4
EN: 8
RU: 1
AI status
Completed
Completed
100%
Causes
- Open or short in wiring between instrument cluster and body control module
- Corroded or loose connector at cluster or body control module
- Failed cluster lamp/LED or internal cluster driver electronics
- Faulty body control module (BCM) or software glitch
- Poor ground at instrument cluster or BCM
- Intermittent connection due to vibration or water ingress
Symptoms
- Oil change warning lamp stays on continuously or does not illuminate when it should
- Inconsistent lamp operation (flicker or intermittent)
- Related cluster warnings or partial instrument cluster failures
- DTC stored in body/electronics module and possibly cluster
What to check
- Read stored codes with a compatible scan tool and record freeze/frame data
- Verify battery voltage is within normal range (12–14.5 V)
- Perform instrument cluster bulb/LED self-test (follow vehicle-specific procedure)
- Visually inspect connectors and wiring at the instrument cluster and body control module for corrosion, damage or loose pins
- Check and clean ground connections for the instrument cluster and BCM
- Clear the code and see if it returns after a short drive
Signal parameters
- Normal vehicle battery voltage available at lighting circuits (~12 V with engine off, 13–14.5 V with engine running)
- Good ground continuity: instrument cluster ground resistance should be low (
- Data/communication lines (CAN/LIN) show normal bus activity when monitored with a scan tool (logic levels per manufacturer spec, typically 0–5 V differential for CAN)
- Lamp driver output may be switched to ground or 12 V depending on design — expect a change when lamp commanded on
Diagnostic algorithm
- Connect a professional scan tool capable of reading body/cluster modules and confirm B1377 and any related codes; note whether code is active or historic.
- Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
- Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
- With ignition on, measure voltage at the lamp/LED connector while commanding the oil change lamp on/off (via scan tool or self-test). Verify expected switching voltage or ground reference.
- Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
- If wiring and grounds are good but lamp still not responding, remove and bench-test or replace the instrument cluster (or LED assembly) per service manual.
- If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
- After repairs, clear codes and perform road/test cycle to confirm the fault does not return.
Likely causes
- Corroded connector pin at instrument cluster or BCM
- Broken wire in harness behind dash
- Failed LED driver inside instrument cluster
- Loss of ground for the instrument cluster
Fault status
Status
Electrical fault detected in oil change indicator circuit — code stored in body/cluster module (may be active or intermittent).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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Code
B1377
FIAT
B — Body
Oil change warning lamp circuit
Views:
UK: 4
EN: 9
RU: 2
AI status
Completed
Completed
100%
Causes
- Open or short in wiring between instrument cluster and body control module
- Corroded or loose connector at cluster or body control module
- Failed cluster lamp/LED or internal cluster driver electronics
- Faulty body control module (BCM) or software glitch
- Poor ground at instrument cluster or BCM
- Intermittent connection due to vibration or water ingress
Symptoms
- Oil change warning lamp stays on continuously or does not illuminate when it should
- Inconsistent lamp operation (flicker or intermittent)
- Related cluster warnings or partial instrument cluster failures
- DTC stored in body/electronics module and possibly cluster
What to check
- Read stored codes with a compatible scan tool and record freeze/frame data
- Verify battery voltage is within normal range (12–14.5 V)
- Perform instrument cluster bulb/LED self-test (follow vehicle-specific procedure)
- Visually inspect connectors and wiring at the instrument cluster and body control module for corrosion, damage or loose pins
- Check and clean ground connections for the instrument cluster and BCM
- Clear the code and see if it returns after a short drive
Signal parameters
- Normal vehicle battery voltage available at lighting circuits (~12 V with engine off, 13–14.5 V with engine running)
- Good ground continuity: instrument cluster ground resistance should be low (
- Data/communication lines (CAN/LIN) show normal bus activity when monitored with a scan tool (logic levels per manufacturer spec, typically 0–5 V differential for CAN)
- Lamp driver output may be switched to ground or 12 V depending on design — expect a change when lamp commanded on
Diagnostic algorithm
- Connect a professional scan tool capable of reading body/cluster modules and confirm B1377 and any related codes; note whether code is active or historic.
- Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
- Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
- With ignition on, measure voltage at the lamp/LED connector while commanding the oil change lamp on/off (via scan tool or self-test). Verify expected switching voltage or ground reference.
- Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
- If wiring and grounds are good but lamp still not responding, remove and bench-test or replace the instrument cluster (or LED assembly) per service manual.
- If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
- After repairs, clear codes and perform road/test cycle to confirm the fault does not return.
Likely causes
- Corroded connector pin at instrument cluster or BCM
- Broken wire in harness behind dash
- Failed LED driver inside instrument cluster
- Loss of ground for the instrument cluster
Fault status
Status
Electrical fault detected in oil change indicator circuit — code stored in body/cluster module (may be active or intermittent).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
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Code
B1377
HUMMER
B — Body
Device Ignition 3 (ON) Circuit Low (BCM)
Views:
UK: 5
EN: 14
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or short in wiring between instrument cluster and body control module
- Corroded or loose connector at cluster or body control module
- Failed cluster lamp/LED or internal cluster driver electronics
- Faulty body control module (BCM) or software glitch
- Poor ground at instrument cluster or BCM
- Intermittent connection due to vibration or water ingress
Symptoms
- Oil change warning lamp stays on continuously or does not illuminate when it should
- Inconsistent lamp operation (flicker or intermittent)
- Related cluster warnings or partial instrument cluster failures
- DTC stored in body/electronics module and possibly cluster
What to check
- Read stored codes with a compatible scan tool and record freeze/frame data
- Verify battery voltage is within normal range (12–14.5 V)
- Perform instrument cluster bulb/LED self-test (follow vehicle-specific procedure)
- Visually inspect connectors and wiring at the instrument cluster and body control module for corrosion, damage or loose pins
- Check and clean ground connections for the instrument cluster and BCM
- Clear the code and see if it returns after a short drive
Signal parameters
- Normal vehicle battery voltage available at lighting circuits (~12 V with engine off, 13–14.5 V with engine running)
- Good ground continuity: instrument cluster ground resistance should be low (
- Data/communication lines (CAN/LIN) show normal bus activity when monitored with a scan tool (logic levels per manufacturer spec, typically 0–5 V differential for CAN)
- Lamp driver output may be switched to ground or 12 V depending on design — expect a change when lamp commanded on
Diagnostic algorithm
- Connect a professional scan tool capable of reading body/cluster modules and confirm B1377 and any related codes; note whether code is active or historic.
- Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
- Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
- With ignition on, measure voltage at the lamp/LED connector while commanding the oil change lamp on/off (via scan tool or self-test). Verify expected switching voltage or ground reference.
- Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
- If wiring and grounds are good but lamp still not responding, remove and bench-test or replace the instrument cluster (or LED assembly) per service manual.
- If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
- After repairs, clear codes and perform road/test cycle to confirm the fault does not return.
Likely causes
- Corroded connector pin at instrument cluster or BCM
- Broken wire in harness behind dash
- Failed LED driver inside instrument cluster
- Loss of ground for the instrument cluster
Fault status
Status
Electrical fault detected in oil change indicator circuit — code stored in body/cluster module (may be active or intermittent).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
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Code
B1377
Other
B — Body
Oil Change Lamp Circuit Failure
Views:
UK: 13
EN: 27
RU: 11
AI status
Completed
Completed
100%
Causes
- Open or short in wiring between instrument cluster and body control module
- Corroded or loose connector at cluster or body control module
- Failed cluster lamp/LED or internal cluster driver electronics
- Faulty body control module (BCM) or software glitch
- Poor ground at instrument cluster or BCM
- Intermittent connection due to vibration or water ingress
Symptoms
- Oil change warning lamp stays on continuously or does not illuminate when it should
- Inconsistent lamp operation (flicker or intermittent)
- Related cluster warnings or partial instrument cluster failures
- DTC stored in body/electronics module and possibly cluster
What to check
- Read stored codes with a compatible scan tool and record freeze/frame data
- Verify battery voltage is within normal range (12–14.5 V)
- Perform instrument cluster bulb/LED self-test (follow vehicle-specific procedure)
- Visually inspect connectors and wiring at the instrument cluster and body control module for corrosion, damage or loose pins
- Check and clean ground connections for the instrument cluster and BCM
- Clear the code and see if it returns after a short drive
Signal parameters
- Normal vehicle battery voltage available at lighting circuits (~12 V with engine off, 13–14.5 V with engine running)
- Good ground continuity: instrument cluster ground resistance should be low (
- Data/communication lines (CAN/LIN) show normal bus activity when monitored with a scan tool (logic levels per manufacturer spec, typically 0–5 V differential for CAN)
- Lamp driver output may be switched to ground or 12 V depending on design — expect a change when lamp commanded on
Diagnostic algorithm
- Connect a professional scan tool capable of reading body/cluster modules and confirm B1377 and any related codes; note whether code is active or historic.
- Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
- Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
- With ignition on, measure voltage at the lamp/LED connector while commanding the oil change lamp on/off (via scan tool or self-test). Verify expected switching voltage or ground reference.
- Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
- If wiring and grounds are good but lamp still not responding, remove and bench-test or replace the instrument cluster (or LED assembly) per service manual.
- If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
- After repairs, clear codes and perform road/test cycle to confirm the fault does not return.
Likely causes
- Corroded connector pin at instrument cluster or BCM
- Broken wire in harness behind dash
- Failed LED driver inside instrument cluster
- Loss of ground for the instrument cluster
Fault status
Status
Electrical fault detected in oil change indicator circuit — code stored in body/cluster module (may be active or intermittent).
Repair difficulty: Medium
Diagnostic time: 0.5 - 2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
1
LAND ROVER 1
Land Rover Defender Workshop Manual 1999-2002 MY
Workshop ManualYour experience will help others
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