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Home / DTC / B1377 — Oil change warning lamp circuit

B1377 — Oil change warning lamp circuit

Detailed page for trouble code B1377.

34,380codes
59brands
11,889generic
22,491specific
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Code

B1377

ALFA ROMEO B — Body

Oil change warning lamp circuit

Brand: ALFA ROMEO
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
  3. Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
  4. 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.
  5. Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
  6. 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.
  7. If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
  8. 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

B1376 B1378 B1320 P0520 P0521 U0155
89

Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

ALFA ROMEO

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Code

B1377

FIAT B — Body

Oil change warning lamp circuit

Brand: FIAT
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
  3. Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
  4. 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.
  5. Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
  6. 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.
  7. If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
  8. 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

B1376 B1378 B1320 P0520 P0521 U0155
Repair manuals

Manual library for FIAT

26

Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

FIAT

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Code

B1377

HUMMER B — Body

Device Ignition 3 (ON) Circuit Low (BCM)

Brand: HUMMER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
  3. Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
  4. 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.
  5. Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
  6. 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.
  7. If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
  8. 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

B1376 B1378 B1320 P0520 P0521 U0155
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1377

Other B — Body

Oil Change Lamp Circuit Failure

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

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

  1. 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.
  2. Use cluster self-test to confirm lamp operation. If lamp fails self-test, suspect cluster or wiring to cluster.
  3. Visually inspect connectors and wiring at the instrument cluster and BCM for damage, corrosion, bent pins or water ingress; repair as needed.
  4. 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.
  5. Check continuity and resistance of wiring between cluster and BCM and verify cluster ground(s). Repair any opens/shorts and secure grounds.
  6. 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.
  7. If cluster replacement does not clear the fault, inspect/replace the body control module or update module software per factory procedures.
  8. 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

B1376 B1378 B1320 P0520 P0521 U0155
7,781

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