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.

U0201 — U0201 — Lost Communication With "Door Control Module C". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: aftermarket equipment interfering with the bus, corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground.
U0202 — Lost Communication With "Door Control Module D" (U0202): 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, damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage.
U0203 — U0203 — Lost Communication With "Door Control Module E". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.
U0205 — Lost Communication With "Door Control Module G" (U0205): 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, water ingress in harness junctions, poor grounds or low battery voltage.
U0206 — OBD2 code U0206 flags a problem with the vehicle network (CAN bus) communication (lost communication with folding top control module). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage.
U0207 — OBD2 code U0207 flags a problem with the vehicle network (CAN bus) communication (lost communication with movable roof control module). Short, gentle driving to a shop is usually possible. Common culprits: damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down, poor grounds or low battery voltage.
U0208 — Lost Communication With "Seat Control Module A" (U0208): 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, aftermarket equipment interfering with the bus, corroded connectors, especially in wet areas.
U0209 — OBD2 code U0209 flags a problem with the vehicle network (CAN bus) communication (lost communication with "seat control module B"). Short, gentle driving to a shop is usually possible. Common culprits: water ingress in harness junctions, aftermarket equipment interfering with the bus, a faulty module pulling the bus down.
U0211 — Lost Communication With "Seat Control Module D" (U0211): 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, water ingress in harness junctions.
U0212 — U0212 — Lost Communication With Steering Column Control Module. 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, water ingress in harness junctions, damaged CAN bus wiring or short to power/ground.
U0213 — OBD2 code U0213 flags a problem with the vehicle network (CAN bus) communication (lost communication with mirror control module). Short, gentle driving to a shop is usually possible. Common culprits: corroded connectors, especially in wet areas, water ingress in harness junctions, aftermarket equipment interfering with the bus.
U0214 — OBD2 code U0214 flags a problem with the vehicle network (CAN bus) communication (lost communication with remote function actuation). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, water ingress in harness junctions, damaged CAN bus wiring or short to power/ground.
U0215 — U0215 — Lost Communication With "Door Switch A". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: a faulty module pulling the bus down, corroded connectors, especially in wet areas, poor grounds or low battery voltage.
U0216 — OBD2 code U0216 flags a problem with the vehicle network (CAN bus) communication (lost communication with "door switch B"). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, corroded connectors, especially in wet areas, a faulty module pulling the bus down.
U0217 — U0217 — Lost Communication With "Door Switch C". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: aftermarket equipment interfering with the bus, a faulty module pulling the bus down, damaged CAN bus wiring or short to power/ground.
U0218 — U0218 — Lost Communication With "Door Switch D". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: damaged CAN bus wiring or short to power/ground, a faulty module pulling the bus down, aftermarket equipment interfering with the bus.
U0219 — U0219 — Lost Communication With "Door Switch E". 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, corroded connectors, especially in wet areas, a faulty module pulling the bus down.
U0220 — OBD2 code U0220 flags a problem with the vehicle network (CAN bus) communication (lost communication with "door switch F"). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground, aftermarket equipment interfering with the bus.
U0221 — OBD2 code U0221 flags a problem with the vehicle network (CAN bus) communication (lost communication with "door switch G"). Short, gentle driving to a shop is usually possible. Common culprits: aftermarket equipment interfering with the bus, water ingress in harness junctions, poor grounds or low battery voltage.
U0222 — OBD2 code U0222 flags a problem with the vehicle network (CAN bus) communication (lost communication with "door window motor A"). Short, gentle driving to a shop is usually possible. Common culprits: poor grounds or low battery voltage, a faulty module pulling the bus down, aftermarket equipment interfering with the bus.
U0223 — U0223 — Lost Communication With "Door Window Motor B". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: corroded connectors, especially in wet areas, damaged CAN bus wiring or short to power/ground, poor grounds or low battery voltage.
U0224 — U0224 — Lost Communication With "Door Window Motor C". 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, aftermarket equipment interfering with the bus, a faulty module pulling the bus down.
U0225 — OBD2 code U0225 flags a problem with the vehicle network (CAN bus) communication (lost communication with "door window motor D"). Short, gentle driving to a shop is usually possible. Common culprits: a faulty module pulling the bus down, corroded connectors, especially in wet areas, aftermarket equipment interfering with the bus.
U0226 — U0226 — Lost Communication With "Door Window Motor E". A fault in the vehicle network (CAN bus) communication. Short, gentle driving to a shop is usually possible. Typical causes: aftermarket equipment interfering with the bus, poor grounds or low battery voltage, damaged CAN bus wiring or short to power/ground.