B1307

Code

Other B — Body

Oil Level Switch Circuit Short To Battery

Brand: Other

Type: B — Body

Views: UK: 34 EN: 63 RU: 38

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Page language: EN

Causes

Damaged or chafed wiring contacting battery positive or a fused power feed
Corroded, bent, or pushed‑in terminal in the oil level switch connector
Failed oil level switch with internal short to B+
Aftermarket accessory or previous repair splice tied the circuit to battery
Faulty control module or poor module pin contact
Moisture or contamination in connector creating conductive path to B+

Symptoms

Warning lamp or message related to oil level/capacitor sensor (if equipped)
Stored B1307 diagnostic trouble code
Possible incorrect oil level readings or inability to read oil level
Intermittent or permanent fault indication depending on short severity

What to check

Retrieve freeze frame and freeze data; note conditions when code set
Visually inspect oil level sensor connector and wiring harness for damage
Check for aftermarket accessories or recent repairs near harness
With ignition ON, measure voltage at the sensor connector signal pin
Check continuity from the signal wire to battery positive and to ground
Unplug the oil level sensor and see if the code clears or behavior changes

Signal parameters

Battery nominal voltage: ~12–14.5 V (vehicle running/charging)
If shorted to B+, signal wire will read near battery voltage with ignition ON
Normal (no short) signal: depends on manufacturer — often open or low voltage when inactive; consult service manual
Continuity: with harness disconnected, signal wire should NOT have continuity to battery positive (open circuit)
Resistance: if the sensor is specified, compare measured ohms to manufacturer spec

Diagnostic algorithm

Read and record DTC(s) and freeze-frame data. Note whether code is permanent or intermittent.
Visually inspect the oil level sensor connector, wiring, and nearby harness routing for chafing, pinched insulation, repairs, or melted insulation.
With ignition ON (engine off) backprobe the sensor signal pin and measure voltage. If it reads near battery voltage, suspect a short to B+.
Disconnect the oil level sensor connector. Clear the DTC and cycle ignition. If the code does not return with the sensor unplugged, suspect sensor or harness between connector and module.
Check continuity between the signal wire and battery positive. A short will show low resistance. If continuity present, isolate by probing segments or disconnecting connectors to locate the short.
Inspect connector terminals for swapped or pushed‑in pins and for corrosion. Repair or replace damaged connector/terminals as required.
If harness appears intact, bench test or replace the oil level switch per manufacturer procedure to confirm if internal short is present.
If wiring and sensor check good, inspect PCM/BCM connector and pins for damage and verify that the module is not supplying unintended battery voltage. Replace or repair module only after confirming harness and sensor are good.
After repairs, reconnect, clear codes, and perform a road or functional test. Re-scan to confirm the code does not return.
If repairs required cutting or splicing wiring, disconnect negative battery before doing repairs and follow good soldering/heat‑shrink or OEM splice procedures.