B1306

Code

Other B — Body

Oil Level Switch Circuit Open

Brand: Other

Type: B — Body

Views: UK: 26 EN: 43 RU: 38

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Broken or disconnected wiring between the oil level switch and the control module
Corroded, bent or loose connector pins at the oil level switch
Failed/open oil level switch / sensor
Blown fuse or poor ground related to the oil level circuit
Poor crimp or terminal back-out in the harness
Intermittent/failed control module input (rare)

Oil level warning lamp or message on dash
Instrument cluster shows incorrect or '—' oil level reading
Oil level sensor DTC stored (B1306)
Some vehicles may refuse to enable certain cold-start protections or display service reminders
No oil pressure loss or drivability symptoms (electrical, not mechanical), unless related faults exist

Scan for B1306 and any related codes (B13xx, P05xx) and record freeze frame/live data
Visually inspect oil level switch connector and harness for damage, corrosion or oil contamination
Check related fuses and grounds for continuity and security
Measure voltage at the switch connector with connector backprobe (key ON) per service data
Check continuity/resistance between switch pin and module pin with harness disconnected
Wiggle test harness while monitoring live data or check engine light for intermittent behavior

Expected circuit voltage (key ON): typically 0–5 V or switched 12 V depending on design — check OEM spec
Open-circuit = infinite resistance / no continuity between switch terminal and module ground or reference
Closed switch resistance: near 0 Ω when activated (verify with service manual values)
Diagnostic input is a digital on/off or low/high level — consult factory wiring for exact levels

Retrieve freeze frame and all stored codes. Note whether the code is current or historic.
Visually inspect the oil level sensor connector and wiring for damage, oil ingress, corrosion, pin push-out or loose terminals.
Verify relevant fuses and power/ground circuits for the related body or engine control module.
With ignition ON (engine OFF), backprobe the sensor connector and measure reference voltage and signal to ground; compare to OEM spec.
Check continuity between the sensor signal pin and the module input pin. Repair any open circuit found.
If wiring and connectors are good, disconnect sensor and measure resistance of the oil level switch per service manual. Replace sensor if out of specification or open when it should be closed.
If sensor, wiring and fuses check good, inspect/replace connector terminals or repair harness splices. Use dielectric grease where allowed.
If fault persists after repairs, consider module input testing or replacement only after exhausting wiring/sensor checks.
Clear codes and perform functional test / test drive to confirm repair. Re-scan for recurrence.