P0203 on Volkswagen
Injector Circuit/Open - Cylinder 3
P0203 on Volkswagen vehicles indicates injector circuit/open - cylinder 3. Au7o has documented this code across 1 Volkswagen model — most commonly on Caddy. This code means the Engine Control Module detected an electrical problem (open circuit or out-of-range resistance) in the fuel injector control circuit for cylinder 3. The ECM pulses each injector electrically and watches the circuit to verify it is operating. P0203 means the expected feedback for cylinder 3's injector is missing or abnormal, so that cylinder may not be fueling properly. The typical result is a misfire, rough idle, and reduced performance traceable to cylinder 3. Typical repair costs on Volkswagen range from $1,600 to $3,800, depending on the specific model and root cause.
Common Causes of P0203
- •Damaged or corroded injector connector at cylinder 3
- •Open or shorted wiring in the injector control circuit
- •Failed (electrically open) fuel injector on cylinder 3
- •Loose or backed-out connector pin
- •Poor ground or power feed to the injector
- •Faulty injector driver inside the ECM/PCM
- •Chafed harness causing intermittent open
P0203 on Volkswagen by Model
Volkswagen Caddy(1 issue)
- TDI fuel injector failure (expensive when replaced as a set)2010-2015
The TDI common-rail injectors on the Caddy are a recognised weak point and can fail with little or no warning. When one fails, owners report sputtering, rough running and limp mode. VW workshops generally insist on replacing all injectors together, so the OEM repair runs into the thousands. Frequent short journeys and poor-quality (supermarket) diesel are cited contributors.
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View P0203 across all makes →Frequently Asked Questions
What does P0203 mean on Volkswagen?▼
P0203 stands for "Injector Circuit/Open - Cylinder 3." This code means the Engine Control Module detected an electrical problem (open circuit or out-of-range resistance) in the fuel injector control circuit for cylinder 3. The ECM pulses each injector electrically and watches the circuit to verify it is operating. P0203 means the expected feedback for cylinder 3's injector is missing or abnormal, so that cylinder may not be fueling properly. The typical result is a misfire, rough idle, and reduced performance traceable to cylinder 3. On Volkswagen specifically, this code is documented across 1 model.
What causes P0203 on Volkswagen vehicles?▼
Common causes on Volkswagen: Damaged or corroded injector connector at cylinder 3, Open or shorted wiring in the injector control circuit, Failed (electrically open) fuel injector on cylinder 3, Loose or backed-out connector pin, Poor ground or power feed to the injector. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0203 on a Volkswagen?▼
Repair costs on Volkswagen range from $1,600 to $3,800, depending on the specific model and root cause.
Which Volkswagen models have P0203 documented?▼
Au7o has documented P0203 on 1 Volkswagen model: Caddy.