KNOWN FAULTS · Mercedes-Benz
Mercedes-Benz Clase C (W206) C 43 AMG (M139, 2.0) common problems.
2021–2026 · Petrol
Sources are not verified in real time and no entry confirms that your car is affected.
2 known faults with sources
Applies if: Only if fitted with the automatic gearbox described in the record.
9G-Tronic harsh shiftingAutomatic gearbox
- Engine / equipment
- 9G-Tronic automatic gearbox (725.0 and 725.1): C-Class W205 and W206, E W212 and W213, CLS, S W222 and W223, GLC, GLE, GLS, SL and SLC
- Period mentioned
- 2013–2026
- Symptoms
- Harsh or jerky shifts (especially 1st to 2nd and when cold), vibration, delayed shifts or limp mode; sometimes the gear will not engage from N to D. Codes P073E00 and P07B700.
- Possible cause described
- Mercedes acknowledges in a technical bulletin complaints of harsh shifts, shudder and limp mode with various causes. In the early years (2014–2016) it is usually software or adaptation rather than mechanical damage; in other cases the pressure sensor built into the gearbox control unit fails.
- Check for the garage
- Follow the Mercedes bulletin: reproduce the complaint, save the EEPROM, check the oil level, run the Xentry valve flush, update engine, gearbox and shift unit software and perform the standstill adaptation. If it persists, check the control unit.
- Cost cited in the source
- Software update and adaptation: the most common and cheapest fix; repairing or replacing the control unit costs considerably more (the sources give no comparable figures)A rough figure from the original database, not an up-to-date quote.
Sources from the original database
Mercedes-Benz (NHTSA): 9G-Tronic bulletin LI27.00-P-060741Mercedes-Benz (NHTSA): 725.1 bulletin (updated 9G-Tronic)Mercedes-Benz (NHTSA): harsh 1st-to-2nd shift with the M264 engineKfz-Meisterbetrieb Dietrich: 9G-Tronic in the C-Class W205ABS Stuurapparaten: codes P073E00 and P07B700
View full entryApplies if: US bulletin (XENTRY LI27.60-P-076554) for the C 43, SL 43 and C 63 S E Performance with the M139 engine and 725.1 gearbox; in Europe, ask the dealer.
Harsh shifts from 1st to 4th and jolts when pulling away (AMG 43 and C 63 S E Performance with M139)Automatic gearbox
- Engine / equipment
- Mercedes-AMG C 43, SL 43 and C 63 S E Performance (M139, 2.0) with the 725.1 gearbox
- Period mentioned
- 2022–2025 (US model years)
- Symptoms
- Harsh 1st-to-2nd, 2nd-to-3rd and 3rd-to-4th shifts, jerky shifting and a jolt when accelerating from a stop.
- Possible cause described
- The gearbox software learns clutch fill times and torque values that are too high. In the E Performance, shifting also gets worse when the high-voltage battery drops below 25 %. Mercedes-Benz describes it in technical note LI27.60-P-076554.
- Check for the garage
- Ask the garage to check the gearbox software level (VGS) and apply note LI27.60-P-076554 (update, oil level and valve flushing) before replacing parts.
- Cost cited in the source
- No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.
Sources from the original database
View full entryOther engines of the Mercedes-Benz Clase C (W206)
- C 180 / 200 / 300 (M254)Petrol
- C 200 d / 220 d (OM654)Diesel
- C 300 e / 300 dePlug-in hybrid
- C 63 S E Performance (M139, 2.0)Plug-in hybrid
- All known faults for the Mercedes-Benz Clase C (W206)