OBD2 Fault Code Library

Free lookup for thousands of OBD2 trouble codes: filter by family, read short meanings, and open deeper articles. Desktop ELM327 scanner with live data and AI guidance.

OBD2 symptoms

Look up diagnostic trouble codes by what the car is doing: misfire, overheating, rough idle, a check engine light, and other common symptoms.

U2023 — U2023 — External Node Fault Report Received. U2023 is a network hand-off fault that may conceal a more important source fault.
U2024 — U2024 — Audio Redundant Steering-Wheel Module Not Responding. U2024 usually leaves normal steering and braking unaffected but disables or disrupts steering-wheel audio controls.
U2025 — U2025 — SDARS Module Not Responding. U2025 alone does not prove the vehicle is unsafe to drive, but loss of SDARS communication can affect immobilization or theft-deterrent operation.
U2026 — U2026 — Family Entertainment System Module Not Responding. U2026 is generally a non-safety convenience-system fault, so the vehicle can often be driven if steering, brakes, warning systems, and required cameras operate normally.
U2027 — U2027 — Left Side Crash Sensor Fault. A vehicle with U2027 may still operate normally, but the left side crash-sensing path should not be relied upon until the fault is repaired.
U2028 — U2028 — Right Side Crash Sensor Fault. U2028 identifies a fault in the right-side crash sensor circuit, and the airbag system may be limited until it is repaired.
U2029 — U2029 — DVD Unit Not Responding. U2029 is normally a caution-level fault. The vehicle may remain operable, but the DVD unit and potentially related infotainment functions may be unavailable. Diagnose the communication fault before relying on the.
U2031 — U2031 — Inner Left Rear TPMS Sensor No Response. U2031 can leave the inner left rear tire pressure unmonitored, although the vehicle may otherwise drive normally.
U2032 — U2032 — Inner Right Rear TPMS No Response. U2032 does not by itself require stopping the vehicle, but the inner right rear tire cannot be monitored electronically.
U2050 — U2050 — Parking Sensor Module Communication Loss. U2050 usually affects parking assistance rather than propulsion, but drivers must rely entirely on mirrors and visual checks until it is repaired.
U2051 — U2051 — Missing or Corrupt Vehicle Calibration Files. U2051 may allow limited driving if essential modules remain online and no safety-critical warning is present.
U2060 — U2060 — ECU Redundant Power Circuit Open. U2060 indicates an open redundant ECU power path and may precede controller resets or communication loss.
U2061 — U2061 — ECU Redundant Power Short to Ground. U2061 can affect ECU redundancy and network communication even if the vehicle still starts.
U2062 — U2062 — ECU Redundant Ground Open Circuit. U2062 means the ECU has lost one of its intended ground paths, so redundancy is compromised.
U2064 — U2064 — Another Module Requested Warning Indicator. U2064 identifies a warning request from another control module, so the underlying condition should be diagnosed promptly.
U2096 — U2096 — PCM Bus-Off Communication Loss. If U2096 is active, avoid extended driving and arrange diagnostic service promptly.
U2152 — OBD2 code U2152 flags a problem with the vehicle network (CAN bus) communication (SCP (J1850) invalid data from GEM). Short, gentle driving to a shop is usually possible. Common culprits: damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage, corroded connectors, especially in wet areas.
U2160 — SCP (J1850) Invalid Data from IC (U2160): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by water ingress in harness junctions, poor grounds or low battery voltage, aftermarket equipment interfering with the bus.
U2500 — OBD2 code U2500 flags a problem with the vehicle network (CAN bus) communication ((CAN) lack of acknowledgement from engine management). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, poor grounds or low battery voltage, a faulty module pulling the bus down.
U3000 — OBD2 code U3000 flags a problem with the vehicle network (CAN bus) communication (control module). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, damaged CAN bus wiring or short to power/ground, water ingress in harness junctions.
U3002 — Vehicle Identification Number (U3002): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by a faulty module pulling the bus down, corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground.
U3004 — U3004 — Accessory Power Relay. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: poor grounds or low battery voltage, a faulty module pulling the bus down, corroded connectors, especially in wet areas.
U3005 — U3005 — Retained Accessory Power. A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: water ingress in harness junctions, a faulty module pulling the bus down, poor grounds or low battery voltage.
U3006 — Control Module Input Power "A" (U3006): a vehicle network fault affecting the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Most often caused by poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.