P1684 — 6 documented meanings by make
Documented by: AUDI, CHEVROLET (USA), CHRYSLER, CITROEN, FORD, HONDA, MAZDA, PEUGEOT, SEAT, SKODA, VOLKSWAGEN — the meaning can differ between manufacturers
P1684 does not mean the same thing on every car — manufacturers reuse the number for different faults. 11 makes document it: Audi, Chevrolet (USA), Chrysler, Citroen, Ford, Honda, Mazda, Peugeot, SEAT, Skoda, Volkswagen. Find your make below.
| Make | Documented meaning | Points at |
|---|---|---|
| Audi | Control unit programming, communication error | control module |
| SEAT | Control unit programming, communication error | control module |
| Skoda | Control unit programming, communication error | control module |
| Volkswagen | Control unit programming, communication error | control module |
| Chevrolet (USA) | Driver 5 line 4 | |
| Chrysler | The battery has been disconnected within the last 50 starts | charging system |
| Citroen | Metering oil pump position sensor circuit | |
| Ford | Metering oil pump position sensor circuit | |
| Mazda | Metering oil pump position sensor circuit | |
| Honda | Throttle valve return spring performance, ISV return spring performance | |
| Peugeot | Electronic Feedback Signal Not Detected |
P1684 on Audi, SEAT, Skoda, Volkswagen
On Audi, SEAT, Skoda, Volkswagen vehicles P1684 is documented as: Control unit programming, communication error. P1684 points at control module. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Audi, SEAT, Skoda, Volkswagen codes:
P1684 on Chrysler
On Chrysler vehicles P1684 is documented as: The battery has been disconnected within the last 50 starts. P1684 points at charging system. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Chrysler codes:
Which one is yours
A generic OBD reader gives you the number, not which of these meanings your manufacturer assigned to it. To get to the specific one:
- Use a brand-specific scanner — VCDS for VAG, INPA or ISTA for BMW, XENTRY for Mercedes, Forscan for Ford. It shows the manufacturer's own text rather than the generic one.
- Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
- Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
- If you have no brand scanner, tell me the make and model below and I will tell you which of these applies to your car.
Code family
P1xxx is manufacturer-specific code (VW/Audi, BMW, Mercedes, Toyota etc. have different meanings for the same code number).
Severity
Manufacturer-specific codes need a brand scanner (VCDS for VAG, INPA for BMW, STAR for Mercedes).
That is what holds for P1684 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
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Code breakdown
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
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