VAG Fault Codes

About VAG codes

Makes covered: Volkswagen, Audi, Seat, Skoda, Porsche.

This page covers five makes together. The CarCoding database keeps their manufacturer-specific codes in a single VAG table, because these makes largely share electronic architecture and code definitions within the same group. Publishing a separate page per make would mean publishing identical content five times.

The list uses VAG’s own component numbers, such as the G28 crankshaft position sensor and the G40 camshaft position sensor, along with group-specific systems like DSG transmission communication. That component numbering does not exist in standard OBD-II; reading the code correctly requires the group’s own vocabulary.

The codes in this table are concentrated in these system groups: chassis (5), network and can bus (5), fuel system (3).

Manufacturer-specific codes are those with 1 (sometimes 2 or 3) as the second digit: they are defined by the manufacturer, not by SAE/ISO. That is why the same code number can indicate two different faults on two different makes, and why a generic code list is of no use for them.

Fault codes for this make

The database holds 24 manufacturer-specific codes for VAG. Each code has its own page with the meaning, possible causes and diagnostic steps:

• B1000Central Electronics Control Unit — MalfunctionCritical
• B1010Vehicle Speed Signal Circuit — MalfunctionWarning
• C0021Front Left ABS System — Hydraulic FaultCritical
• C0022Front Right ABS System — Hydraulic FaultCritical
• C1000ABS/ESP Control Module — Internal FaultCritical
• C1130Lateral Acceleration Sensor — MalfunctionWarning
• C1140Steering Angle Sensor Not CalibratedInfo
• P1093Fuel Rail Pressure — Too Low Under High Engine LoadCritical
• P1250Fuel Preheating Regulator — Circuit MalfunctionWarning
• P1296Cooling System Temperature ProblemsWarning
• P1300Ignition Timing Retard — Cylinders 1-4Warning
• P1337Crankshaft Position Sensor G28 — No Signal While CrankingCritical
• P1338Crankshaft Position Sensor G28 — Signal Out Of RangeWarning
• P1385Camshaft Position Sensor G40 — No SignalCritical
• P1418Secondary Air Injection Circuit — Electrical OpenWarning
• P1421Secondary Air Injection System — Low FlowWarning
• P1543Throttle Actuator — Malfunction (Throttle Motor)Critical
• P1545Throttle Actuator — Position DeviationWarning
• P1671Fuel Pump Relay 1 — Circuit MalfunctionWarning
• U0001High Speed CAN Communication Bus — MalfunctionCritical
• U0100Lost CAN Communication With ECMCritical
• U0103Lost CAN Communication With DSG/TCUWarning
• U0121Lost CAN Communication With ABS/ESP ModuleWarning
• U1118High Speed CAN — Noise/InterferenceWarning

← All fault codes

Data source: the CarCoding fault code database. Code definitions follow the SAE J2012 standard; manufacturers may use different wording for their own codes. Everything on this page is generated from the code-specific database records.