B1375

Code

Other B — Body

Oil Change Lamp Circuit Open

Brand: Other

Type: B — Body

Views: UK: 28 EN: 52 RU: 26

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Page language: EN

Causes

Open or broken wiring in lamp circuit
Corroded or loose connector at lamp socket or instrument cluster
Failed bulb or LED lamp module
Blown fuse or fusible link feeding the instrument cluster
Faulty ground connection for the lamp circuit
Faulty instrument cluster or BCM/ECU driver output

Symptoms

Oil change/wrench indicator does not illuminate when commanded
Lamp permanently off (no function during key on or self-test)
Intermittent operation or only works with key position change/wiggling connector
Related body/instrument cluster lamp failures or flicker

What to check

Use a scan tool to confirm B1375 and check for related codes
Visually inspect lamp bulb/LED, socket and harness for corrosion, damage or disconnection
Check instrument cluster fuse(s) and fusible links
Perform a continuity/resistance check between lamp socket and instrument cluster connector
Backprobe lamp connector with key ON and command lamp via scan tool; observe voltage and ground
Wiggle harness and connectors while observing lamp behavior to spot intermittent opens

Signal parameters

Expected supply voltage at lamp connector with key ON / lamp commanded: approx. battery voltage (~11–14 V) or a switched supply (varies by vehicle)
Expected ground continuity between lamp negative terminal and chassis: low resistance (
Filament bulb typical resistance cold: very low (a few ohms); LED modules may show higher resistance or require module supply current
Open-circuit result: infinite resistance (OL) on continuity check and ~0 V at lamp connector when output expected

Diagnostic algorithm

Confirm presence of B1375 with a scan tool and clear the code, then attempt to re-create the fault while observing lamp behavior.
With key ON, command the oil change lamp ON via scan tool (if available) and observe whether the lamp lights during self-test.
Visually inspect the lamp (bulb or LED), socket and harness for corrosion, bent pins, water intrusion or physical damage. Replace bulb if visibly damaged.
Check relevant fuses supplying the instrument cluster; replace blown fuses and inspect for underlying short.
Backprobe the lamp connector: measure supply voltage with lamp commanded ON and measure continuity to vehicle ground. Document readings.
If no supply voltage at the socket, trace wiring back toward the fuse/cluster: check connectors, splice points and continuity. Repair any open circuits or corroded connectors.
If supply voltage is present but lamp does not light and ground continuity is good, replace the bulb/LED assembly or lamp module.
If wiring and lamp are good but there is still no signal, test the instrument cluster/BCM lamp driver output per manufacturer procedure; repair or replace the cluster or module if driver is defective.
After repair, clear DTCs and confirm the lamp operates correctly through multiple key cycles and scan-tool commanded tests.

Likely causes

Broken/open wire or damaged connector in harness to the lamp
Burnt-out bulb or failed LED module
Corroded/loose ground or supply fuse
Failure of instrument cluster driver output

Fault status

⚠️ Status

Oil change lamp circuit open — the instrument/wrench indicator did not receive the expected continuity or drive voltage when commanded. Code set when open condition detected. Lamp may remain off until circuit is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours