P0204 on Volkswagen: How to Diagnose & Fix
Injector Circuit/Open - Cylinder 4
2 Volkswagen models · 2 documented issues · 1 critical · $1,600-$3,800 repair
P0204 on Volkswagen by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Sputtering / misfire
- Reduced power / limp mode
- Rough idle
- Hard starting
- Excessive smoke
How to Fix
Diagnose with live data / injector return-flow ('back-leak') test to identify the failing injector(s). Replace the affected injector(s) — though a full set is often recommended — and have them coded to the ECU. Use good-quality diesel and take regular longer runs to reduce fouling.
Sources for this issue (1)
Injector circuit faults, which may come and go, can be stored in the engine control module, and the check-engine light may come on. Volkswagen's fix is to replace the fuel injector (T8) wiring harness. Applies to: 2018-2019 Volkswagen Tiguan (long-wheelbase) with the 2.0L engine (VW lists engine codes DDSA and DGUA). The VWP-23-03 warranty extension covers the fuel injector wiring harness for 10 years or 120,000 miles, whichever comes first, counted from the original in-service date. Only a Volkswagen dealer can confirm by VIN.
How to Fix
Have a Volkswagen dealer diagnose the fault. VW technical tip 01-20-02TT says that if P0201, P0202, P0203 or P0204 is stored, the T8 fuel injector harness is replaced. Under VWP-23-03 the dealer replaces the harness at no cost if diagnosis confirms it failed from a warranty defect within the coverage period.
Sources for this issue (2)
P0204 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0204 mean on a Volkswagen?
P0204 stands for "Injector Circuit/Open - Cylinder 4." 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 4. The ECM controls each injector through its own circuit and monitors it to confirm proper operation. P0204 indicates the computer isn't seeing the expected electrical response from cylinder 4's injector, so that cylinder may not be getting the correct fuel. You'll often notice a misfire, rough running, and a loss of power tied to cylinder 4. On Volkswagen it is documented across 2 models: Caddy, Tiguan.
What are the most common causes of P0204?
The most common causes of P0204 are: Damaged or corroded injector connector at cylinder 4, Open or shorted wiring in the injector control circuit, Failed (electrically open) fuel injector on cylinder 4, 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. The specific cause varies by vehicle.
How much does it cost to fix P0204 on a Volkswagen?
Published repair estimates on Volkswagen range from $1,600 to $3,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.