Code Details
| Display code | WABCO RSSplus SID 6 FMI 4 |
|---|---|
| SPN | Not applicable or not verified |
| FMI | 4 |
| OEM code | WABCO / ZF SID 6 FMI 4 |
| Manufacturer | WABCO / ZF |
| System | Trailer ABS / RSSplus |
| Component | Wheel Sensor f |
| Source address | Unknown or not applicable |
| Severity | high |
| Review status | ai source checked |
| Source confidence | high |
| Last reviewed | 2026-05-05 |
Plain-English Meaning
In plain English, this RSSplus entry points to wheel sensor f context on a trailer ABS system. The source-backed label is sensor circuit shorted to ground. It should be treated as a diagnostic starting point, not a final repair conclusion.
The WABCO MM-0888 table maps SID 6 FMI 4 to Wheel Sensor f / sensor circuit shorted to ground. This page paraphrases factual fields only and does not reproduce WABCO service procedures.
Common Symptoms
- Trailer ABS lamp may be on or may blink depending on the trailer system and diagnostic mode
- A WABCO/ZF diagnostic tool may show the SID/FMI
- Trailer ABS function may be affected while foundation brakes may still need separate inspection
- Symptoms may vary by trailer configuration and whether the code is active
Possible Causes
Possible causes may include the items below. The list is not a parts diagnosis.
- Wheel Sensor f wiring, connector, signal, power, ground, or configuration issues may be involved
- Wheel-end condition, sensor gap, tone ring condition, harness routing, moisture, or corrosion can be related for wheel-sensor entries
- Trailer power, PLC/J2497 communication, ECU configuration, or towing-vehicle communication may be related for data-link entries
- Related trailer ABS, power, wheel-speed, or communication codes should be reviewed together
First Checks
- Treat trailer ABS and brake-related warnings as safety-related.
- Record the SID/FMI, trailer ABS lamp behavior, active status, trailer VIN or unit number, and any towing-vehicle codes.
- Look for obvious damaged wiring, loose connectors, corrosion, or recent wheel-end service without bypassing ABS equipment.
- Verify the diagnostic path with WABCO/ZF trailer ABS service information, compatible diagnostics, or a qualified brake-system technician.
Can I Keep Driving?
Trailer ABS and brake-related codes should be handled conservatively. Stop safely for brake warnings, red stop lamps, abnormal braking, wheel-end concerns, or any severe warning condition, and follow fleet or OEM guidance.
Related Lookup Pages
Sources
- WABCO RSSplus Trailer ABS Maintenance Manual MM-0888 WABCO / ZF Commercial Vehicle Solutions · oem · accessed 2026-05-05 · confidence high
Source: WABCO / ZF Commercial Vehicle Solutions, WABCO RSSplus Trailer ABS Maintenance Manual MM-0888. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
Is WABCO RSSplus SID 6 FMI 4 source-backed?
Yes. The SID/FMI mapping is based on WABCO MM-0888 RSSplus trailer ABS service data. This page paraphrases factual fields and adds conservative educational context.
Does WABCO RSSplus SID 6 FMI 4 prove the wheel sensor f is bad?
No. The code identifies a monitored condition. Wiring, connectors, wheel-end condition, power, grounds, configuration, and related codes may also matter.
Can I keep driving with WABCO RSSplus SID 6 FMI 4?
This page cannot approve driving with a trailer ABS or brake warning. Treat brake-system warnings conservatively and follow OEM, fleet, and inspection guidance.