FAQ
TL;DR: Two codes—EDC 03792-10 and GDK/PDF 05502-08—flag the pre‑catalyst exhaust gas temperature sensor; "…relate to the sensor BEFORE the catalyst." For MAN TGX 18.480 owners and techs asking how to fix the light: verify with measured values, then repair wiring or replace the sensor. [Elektroda, MAN Electronics, #17860604]
Why it matters: It targets the correct sensor fast, avoids parts roulette, and clears emissions warnings reliably.
Quick Facts
- EDC 03792-10 = exhaust gas temperature sensor BEFORE the catalyst (front). [Elektroda, MAN Electronics, #17860604]
- GDK/PDF 05502-08 = CAN communication error. [Elektroda, mariusz.sensej, post #17859447]
- EDC 03821-03 = CAN 3 control byte (EGT, AdBlue level, AdBlue temperature). [Elektroda, mariusz.sensej, post #17859447]
- Use diagnostics: measured values will show which sensor is faulty before buying parts. [Elektroda, mariusz.sensej, post #17859760]
- Reported fix: new pre‑cat sensor turned the fault passive after the first drive. [Elektroda, Fast_international, post #17865329]
What does EDC 03792-10 mean on a MAN TGX 18.480?
It flags an issue with the exhaust gas temperature sensor located before the catalytic converter. Focus diagnosis on the pre‑cat EGT sensor. Verify with measured values before replacing parts to ensure accuracy. [Elektroda, MAN Electronics, #17860604]
Where is the sensor for 03792-10 located—before or after the catalyst?
"3792-10 is for a sensor in front of the catalytic converter." Replace or test the pre‑catalyst EGT sensor, not the post‑cat one. This clarification avoids replacing the wrong component. [Elektroda, dare23, post #17860712]
What does GDK/PDF 05502-08 indicate on MAN TGX?
It indicates a CAN communication error. If it appears with 03792-10, still check the pre‑cat EGT sensor and related wiring after reading measured values. Repair communication or sensor faults based on data. [Elektroda, mariusz.sensej, post #17859447]
What is EDC 03821-03 about?
EDC 03821-03 points to CAN 3 control byte signals. It covers exhaust gas temperature, AdBlue level, and AdBlue temperature. Use a scan tool to inspect these channels and confirm which parameter is out of range. [Elektroda, mariusz.sensej, post #17859447]
How do I diagnose 03792-10 quickly without guessing?
Use a scan tool and measured values.
- Connect diagnostics (e.g., Jaltest) and open EGT channels.
- Identify the pre‑cat sensor value and compare with engine state.
- If implausible, check the sensor and harness with a multimeter, then repair or replace.
"In the measured values it should come out which one is." [Elektroda, mariusz.sensej, post #17859760]
Should I clean or replace the EGT sensor for 03792-10?
In the reported case, replacing the pre‑cat sensor cleared the EDC fault. The code went passive immediately, and the first drive was fine. If measured values point to the sensor, replace it and road‑test to confirm. [Elektroda, Fast_international, post #17865329]
Will EDC 03792-10 reduce engine power?
A user reported no noticeable power loss with this code. You can usually drive, but schedule repair soon to maintain emissions system performance and avoid escalation. [Elektroda, kakibara, post #21218532]
Can Jaltest translations mislead sensor position for these codes?
Yes. One user noted Jaltest “translates it strangely,” which can confuse pre‑ vs post‑catalyst identification. Cross‑check with measured values and the truck’s physical sensor layout before replacing parts. [Elektroda, mariusz.sensej, post #17859568]
I already changed the after‑cat sensor; why is 03792-10 still present?
Because 03792-10 relates to the sensor before the catalyst on this platform. Direct your checks and any replacement to the pre‑cat EGT sensor and associated wiring. [Elektroda, MAN Electronics, #17860604]
Which diagnostic tool should I use to see which sensor is bad?
Use a diagnostic computer and read measured values to pinpoint the faulty sensor channel. The display will indicate which sensor is out of range so you avoid unnecessary replacements. [Elektroda, mariusz.sensej, post #17859760]
What actually fixed it in the original thread?
One pre‑catalyst sensor replacement made the EDC fault passive immediately, and the first road test was fine. The poster confirmed, “everything is ok,” indicating a successful repair after a single sensor swap. [Elektroda, Fast_international, post #17865329]
What does “EDC fault passive” mean after replacing the sensor?
It means the ECU no longer sees the fault as active. In the reported case, the code turned passive right after the pre‑cat sensor change and remained fine on the first drive. Continue to monitor. [Elektroda, Fast_international, post #17865329]
Can a wiring fault mimic a bad EGT sensor on 03792-10?
Yes. An open or damaged circuit at the EGT sensor will log a temperature sensor fault. Inspect the sensor harness and connectors for breaks or corrosion before buying a new sensor. [Elektroda, dare23, post #17860200]
What temperatures should a pre‑cat EGT show on a diesel?
Typical diesel EGT before the catalyst is about 200–300°C at light load and can exceed 600°C under high load. Compare your measured values against expected operating conditions to judge plausibility. [Exhaust Gas Temperature Sensors – Function and Diagnostics]
