P0201 on Volkswagen: How to Diagnose & Fix
Injector Circuit/Open - Cylinder 1
2 Volkswagen models · 2 documented issues · 1 critical · $150-$3,800 repair
P0201 on Volkswagen by model: symptoms, diagnosis and fix
On the first two model years of the MQB (second-generation) US Tiguan, the short T8 wiring harness that feeds the four fuel injectors develops intermittent opens/shorts at the injector connectors. The engine drops a cylinder at random, the cluster shows a 'Limit to 4000 RPM' or EPC warning, and the fault often clears and returns, which sends owners through coils, plugs, and even injectors before the harness is identified. Volkswagen issued Technical Tip 01-20-02TT (Feb 2020) telling technicians to replace the T8 harness on 2018-2019 Tiguan 2.0T (engine codes DDSA/DGUA) with injector circuit codes, and later extended warranty coverage on the harness under VWP-23-03 (10 years / 120,000 miles). This is distinct from the carbon-buildup and PCV misfires on the earlier Gen1 EA888.
Common Symptoms
- Intermittent misfire that comes and goes
- 'Limit to 4000 RPM' or EPC warning on cluster
- Rough idle, stumbling under load
- Check engine light with injector circuit codes
- Misfire moves cylinders or does not follow coil swap
How to Fix
Scan for P0201-P0204 (injector circuit) rather than chasing P030x misfire codes alone; wiggle-test the injector harness with the engine running. Replace the injector wiring harness with the updated part (06L971627AB) per VW Tech Tip 01-20-02TT. Ask the dealer to check warranty extension VWP-23-03 (10 yr / 120k mi) before paying; out of pocket the harness is an inexpensive part with 1-2 hours labor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Fuel injector wiring harness (T8 injector sub-harness, engine wiring harness / injector connector harness)OEM06L971627ABCross-ref06L971627T (earlier OE number this harness supersedes — list, 06L971627P (earlier OE revision), Generic replacement harnesses sold on Amazon/eBay under hous$58–$90
This is the exact updated harness VW calls for in Technical Tip 01-20-02TT for 2018-2019 Tiguan 2.0T (engine codes DDSA/DGUA) with injector-circuit codes P0201-P0204 and the 'Limit to 4000 RPM'/EPC message.
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Sources for this issue (4)
- VWVortex - Injector Harness issue - Why isn't this a service bulletin?forum
- VWVortex - 18' Tiguan 'Limit to 4000RPM error' injector harness replaced under warranty, bulletin 01-20-02TTforum
- VWVortex - Random cylinder misfires, can't seem to solve it (VW Tiguan 2.0L TSI)forum
- P0203 on 2018-2022 VW Tiguan 2.0T: Injector Circuit Malfunctionarticle
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 (2)
P0201 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 P0201 mean on a Volkswagen?
P0201 stands for "Injector Circuit/Open - Cylinder 1." P0201 means the engine computer detected an electrical problem in the wiring or control circuit for the fuel injector on cylinder 1. The PCM pulses each injector open and back ground, and when it sees an open circuit, a short, or abnormal resistance on cylinder 1's injector circuit, it sets this code. In practice it means cylinder 1 may not be getting fuel injected properly, which can cause a misfire, rough running, or a no-start on that cylinder. It points to the injector itself or its wiring, not to a fuel-pressure problem affecting the whole engine. On Volkswagen it is documented across 2 models: Tiguan, Caddy.
What are the most common causes of P0201?
The most common causes of P0201 are: Damaged or corroded injector connector or terminals at cylinder 1, Broken, chafed, or shorted injector wiring harness, Failed (open or shorted) fuel injector on cylinder 1, Loose or poor ground/power feed to the injector circuit, Blown injector fuse or relay feeding the bank, Failed injector driver inside the PCM/ECM. The specific cause varies by vehicle.
How much does it cost to fix P0201 on a Volkswagen?
Published repair estimates on Volkswagen range from $150 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.
Looking for P0201 on a different make?
View P0201 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.