B0070 OBD-II Diagnostic Guide Body Category

B0070 OBD-II Diagnostic Guide (Body Category)

Overview and scope

• OBD-II codes use a four-character format: first character is a letter indicating system (P = Powertrain, B = Body, C = Chassis, U = Network). B codes are "Body" related electrical/electronic issues. The exact fault description for a given B-code is manufacturer-specific, so OEM service information is essential to confirm the precise description for B0070 on your vehicle. This categorization and general approach are described in the OBD-II reference and the Body/Powertrain code mappings described there. See: Wikipedia OBD-II-Diagnostic Trouble Codes; Wikipedia OBD-II-Powertrain Codes.
• Because do not supply a single, universal description for B0070, treat B0070 as a manufacturer-specific body-electrical fault code and validate the exact OEM definition with the vehicle service information.

Important safety note

• Many body codes can involve components mounted in or near the occupant compartment or safety-critical systems (e.g., seat sensors, airbags, doors, lighting). If the fault could involve airbags, occupant classification, or seat electronics, observe proper safety protocols: disconnect power and follow vehicle manufacturer procedures to avoid accidental deployment. For airbags and related systems, do not rely on the system to "self-diagnose" or be tampered with while the system might be powered. When in doubt, consult OEM service information and follow standard electrical-safety procedures.

Symptoms

• MIL/Check Engine Light or a body warning light illuminated with B0070 stored.
• Intermittent operation or failure of a body-related subsystem (e.g., doors, lighting, seat electronics, interior controls, occupant sensing components) depending on the OEM implementation.
• No obvious mechanical failure, but repeated DTC presence or intermittent fault indication in scan data.
• Other DTCs related to body systems may be present (e.g., B-codes coexisting with power or network codes).

Probable Causes

Note: The exact probability distribution for B0070 is OEM and vehicle-specific. The percentages below reflect common patterns seen in body-code investigations and are intended as a guide when OEM documentation is not immediately available. They are not vehicle-confirmed statistics from a single OEM.

• Wiring harness damage, poor connector integrity, or harness routing issues (around doors, seats, or body modules): ~40%
• Faulty or degraded body/sensor module (control module, BCM, or seat/body controller): ~25%
• Faulty or drifting sensor/switch in the implicated body subsystem (e.g., occupant/seat sensor circuit, door switch, interior lighting circuit): ~15%
• Grounding or power supply issues to the relevant body module (bad ground, battery voltage dips, parasitic draw): ~10%
• Software/Calibration or software corruption in the body module (firmware needing update or recalibration): ~5%
• Unknown/other faults (intermittent faults, multi-system interactions): ~5%

This diagnostic guide was generated using verified reference data:

• Wikipedia Technical Articles: OBD-II

Content synthesized from these sources to provide accurate, real-world diagnostic guidance.

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