Mercedes-Benz known issues by chassis code and engine

By CarWhere Research · Updated

Most well-known Mercedes-Benz problems belong to a specific engine, transmission or chassis, not a whole model line: balance shaft gears on early M272 and M273 engines, M276 cold-start rattle, Airmatic air suspension, 7G-Tronic conductor plates, and recalls on newer cars. CarWhere lists 80 documented issues across 13 model lines, with years, symptoms and sources.

Mercedes-Benz model lines, chassis codes covered and number of documented issues and recalls
ModelChassis codes coveredIssuesRecallsBest-known issue
Mercedes-Benz C-Class problemsW203, W204, W205, W20695M272 V6 balance shaft sprocket wear (W203 (C 280, C 350))
Mercedes-Benz E-Class problemsW211, W212, W213, W21493SBC hydraulic unit wear (covered by 25-year extended warranty) (W211 (E 320, E 350, E 500/E 550, E 55/E 63 AMG))
Mercedes-Benz S-Class problemsW220, W221, W222, W22374M273 V8 idler gear sprocket wear (W221 (S 550))
Mercedes-Benz GLE / M-Class problemsW164, W166, V16774Brake booster corrosion (do-not-drive recall) (W164 (ML 320 CDI/BlueTEC, ML 350, ML 550, ML 63 AMG))
Mercedes-Benz GLS / GL-Class problemsX164, X166, X16775Brake booster corrosion (do-not-drive recall) (X164 (GL 320 CDI/BlueTEC, GL 350 BlueTEC, GL 450, GL 550))
Mercedes-Benz GLC / GLK problemsX204, X253, X25464Electronic steering lock (ESL/ELV) failure causing no-start (X204 (GLK 350, GLK 250 BlueTEC))
Mercedes-Benz CLA problemsC117, C118657G-DCT dual-clutch shudder and jerky low-speed engagement (C117 (CLA 250, CLA 45 AMG))
Mercedes-Benz GLA problemsX156, H247547G-DCT dual-clutch low-speed shudder (X156 (GLA 250, GLA 45 AMG))
Mercedes-Benz GLB problemsX24744Front axle integral carrier may corrode and fail (X247 (GLB 250, AMG GLB 35))
Mercedes-Benz EQ (EQS, EQE, EQB) problemsV297, X243, V295, X294, X29655High-voltage battery may fail internally (fire risk) — software remedy (X243 (EQB 250, EQB 300 4MATIC, EQB 350 4MATIC))
Mercedes-Benz G-Class problemsW463, W463A55Steering coupling may be under-tightened and wear (W463 (G 550, G 63 AMG, G 65 AMG))
Mercedes-AMG GT problemsC190, X29055Carbon-fiber driveshaft bonding may fail (C190 (AMG GT, AMG GT S))
Mercedes-Benz SL problemsR230, R231, R23254SBC hydraulic unit wear (25-year extended warranty) (R230 (SL 500/SL 550, SL 600, SL 55/63/65 AMG))

Mercedes-Benz C-Class known issues

The best-documented C-Class problems sit in the W203 and W204 generations: M272 V6 balance-shaft sprocket wear on 2006–2007 C 280/C 350 cars, 7G-Tronic conductor-plate faults and steering-lock failures on the W204, plus large sunroof and airbag recalls. Newer W205 and W206 cars mostly show campaign-level recalls rather than recurring mechanical patterns.

Mercedes-Benz E-Class known issues

The W211 E-Class (2003–2009) carries the best-known problems: Sensotronic brake recalls and a 25-year SBC warranty, Airmatic wear on V8 cars, and M272/M273 balance-shaft and idler-gear wear. The W212 adds OM642 BlueTEC oil-cooler leaks, the diesel emissions settlement and M276 cam-adjuster rattle; the W213 and W214 show mainly recalls.

Mercedes-Benz S-Class known issues

Active Body Control hydraulics on the W220, Airmatic wear and M273 idler-gear wear on early W221 S 550s, and M278/M157 timing-chain stretch on 2011–2013 cars are the best-documented S-Class issues. The W222 and W223 show mainly recalls, including S 560 oil plugs, S 580 Camtronic software and front brake hoses.

Mercedes-Benz GLE / M-Class known issues

The W164 M-Class (2006–2011) has the most serious documented issue: a brake-booster corrosion recall with a do-not-drive warning, along with Airmatic wear and OM642 diesel oil-cooler leaks. The W166 adds a fuel-pump control-unit water-damage recall and the BlueTEC emissions settlement; the V167 GLE has 48V ground-cable and transmission-software recalls.

Mercedes-Benz GLS / GL-Class known issues

The X164 GL-Class (2007–2012) carries the heaviest documented issues: the brake-booster corrosion do-not-drive recall, standard Airmatic suspension that wears with age, and Takata driver-airbag replacement. The X166 adds an Active Curve System oil recall and the BlueTEC emissions settlement; the X167 GLS has third-row seatback and transmission recalls.

Mercedes-Benz GLC / GLK known issues

The X204 GLK (2010–2015) carries the best-documented problems: electronic steering-lock no-starts, an airbag control-unit corrosion recall and the GLK 250 BlueTEC emissions settlement. The X253 GLC has mostly campaign recalls, rear seat-belt latches and panoramic roof bonding, and the X254 has a C-pillar compliance recall.

Mercedes-Benz CLA known issues

First-generation C117 CLAs (2014–2019) carry the best-documented issues: low-speed shudder and jerky engagement from the 7G-DCT dual-clutch transmission, plus recalls for camshaft welds, steering grounding and the starter circuit. The C118 CLA (2020 on) is mainly affected by a large driver door-lock micro-switch recall.

Mercedes-Benz GLA known issues

The first-generation X156 GLA (2015–2020) shares the CLA's 7G-DCT dual-clutch behavior and several of its recalls: camshaft welds, steering-shaft bearing wear and steering-column grounding. The H247 GLA (2021 on) has no well-documented mechanical pattern yet; its main item is the large driver door-lock micro-switch recall.

Mercedes-Benz GLB known issues

The GLB (X247, 2020 on) has no well-documented recurring mechanical failure yet. Its notable issues are recalls on early 2020–2021 builds: front-axle carrier corrosion, water entering the front footwells, and the shared driver door-lock micro-switch campaign, plus an MBUX display software fix.

Mercedes-Benz EQ (EQS, EQE, EQB) known issues

The most significant documented EQ issue is the EQB's high-voltage battery fire risk, which was first handled with a software update and an 80% charge limit and later with battery replacement. EQS and EQE sedans and SUVs have had battery-management and drivetrain software recalls that address loss of drive power or missing battery warnings.

Mercedes-Benz G-Class known issues

Documented G-Class issues are mostly recalls. The long-running W463 had a 2013–2016 steering coupling campaign, and the redesigned W463A (2019 on) has had rear door latch, front-axle wiring harness, turbo oil-line and fuel-pump recalls. No single mechanical failure pattern is as well documented as on Mercedes' sedans.

Mercedes-AMG GT known issues

For the two-door AMG GT (C190), the best-documented issue is bonding of the carbon-fiber driveshaft, which was recalled twice. The four-door AMG GT (X290) has recalls for transmission wiring harness corrosion, 48-volt ground cables, turbo oil feed lines and, on the GT 63 S E Performance, hybrid starter-alternator software.

Mercedes-Benz SL known issues

The R230 SL (2003–2012) carries the best-documented SL issues: Sensotronic brake recalls, backed by a 25-year SBC warranty extension covering SLs through 2012, and Active Body Control sensor and maintenance concerns. The R232 SL (2022 on) has a starter/alternator harness recall and, on the SL 63 S E Performance, a hybrid software recall.

Know which engine and options a used Mercedes-Benz really has.

Whether an issue applies often comes down to the exact engine, transmission and options. The data card records how the car was built; CarWhere decodes it from the VIN — free availability check, $9.99 only if build data exists for that car.

Mercedes-Benz data card by VIN

Frequently asked questions

Which Mercedes-Benz engines have the balance shaft problem?

M272 V6 balance shaft sprocket wear is associated with the M272 V6 in W203 and other models of that period (2006–2007). Early M272 V6 engines used a balance-shaft drive sprocket that could wear prematurely, letting the timing chain lose its precise relationship with the camshafts.

Which Mercedes-Benz models have Airmatic air suspension problems?

W211 V8 and AMG models use Airmatic air suspension, with air struts at each corner, a valve block and an electric compressor. Models covered here include W211, W221, W164, X164.

What is the 7G-Tronic conductor plate problem?

The 722.9 seven-speed automatic carries an electronic conductor plate on top of its valve body. It is documented on W204 cars (2008–2014) and other models with the 7G-Tronic automatic.

What are the common OM642 diesel problems?

OM642 BlueTEC diesel oil cooler seal leak is the best-documented OM642 issue (W212, 2011–2013). The OM642 V6 diesel mounts its oil cooler deep in the valley between the cylinder banks.

Are Mercedes-Benz cars expensive to maintain?

Routine service on a Mercedes-Benz generally costs more than on a mainstream car, and some engines and systems have well-known wear items. Most documented problems are tied to specific engines, transmissions and years, so a service history and a pre-purchase inspection by a Mercedes-Benz specialist matter more than the badge.

How do I check a used Mercedes-Benz for open recalls?

Enter the VIN on NHTSA’s recall lookup or ask a Mercedes-Benz dealer to run it; recall repairs are free. The recall campaign numbers on these pages let you check whether a specific campaign applies and has been completed.

Each model page lists its own sources (66 across the guide), including NHTSA recall records, Mercedes-Benz statements and specialist technical coverage. For engine-by-engine background see Mercedes-Benz engine codes. Information is general; an in-person inspection is the only way to know a specific car’s condition.

Sources

Key references behind the non-recall issues above (every NHTSA recall campaign is linked on its model page).

  1. NHTSA recalls database — National Highway Traffic Safety Administration
  2. Mercedes-Benz M272 and M273 engine class-action settlement (Seifi v. Mercedes-Benz USA) — CarComplaints.com
  3. Mercedes-Benz M272 engine — Wikipedia
  4. Active Body Control — Wikipedia
  5. Extended Warranty Update: MY03–12 Model 211, 219, R230, 240, 199 SBC Extended Warranty (Aug 17, 2018) — Mercedes-Benz USA (dealer bulletin, hosted by NHTSA)
  6. Daimler AG and Mercedes-Benz USA, LLC Clean Air Act Civil Settlement — U.S. Environmental Protection Agency
  7. Here's What A 'Conductor Plate' Is And Why It Kills So Many Mercedes Vehicles — The Autopian

More Mercedes-Benz tools

Independent reference compiled by CarWhere — not affiliated with or endorsed by Mercedes-Benz Group AG or Mercedes-Benz USA. Mercedes-Benz, AMG, Maybach and the model names are trademarks of their owner.