CKFCar Known Faults
SevereAffected: 2012-201880,000–140,000 miles

Mercedes-Benz A-Class W176 A200d — Automatic Gearbox Valve Body / Mechatronic Solenoids

The solenoids inside the automatic transmission valve body get clogged with clutch material, causing harsh, thumping gear changes.

Severity

Severe

DIY Difficulty

Professional Only

Est. Cost

£800–£1500

OBD Codes

P0700P0730
Component Diagram

Gearbox

Typical layout and location for the Gearbox assembly.

Gearbox diagram
Reference Illustration

Symptoms

  • Hard 'thump' when selecting Drive or Reverse
  • Flaring revs between gear changes
  • Transmission slipping into neutral
  • Gearbox fault light on dash

Root Cause

Lack of servicing. Most manufacturers claim the gearbox is 'sealed for life', but the oil degrades and clutches shed material, jamming the delicate hydraulic solenoids in the valve body.

How To Fix

  1. First attempt: Full transmission fluid flush and filter change (£200-300).
  2. If unsuccessful, the valve body must be removed and overhauled, or replaced.
  3. Cost: £800-1,500 at an automatic transmission specialist.

Estimated Repair Costs

Repair OptionEst. Cost (GBP)
DIY (parts only)£320–£600
Independent Garage£800–£1500
Main Dealership£1280–£2400

Other Faults on This Variant

Water Pump and Coolant Pipe Leak

Severe
2009-201860,000–120,000 miles£300–£500

The OM651 engine uses a vacuum-actuated water pump that frequently leaks. The plastic coolant junction pipe above it also cracks with heat cycling.

Air Conditioning Condenser Leak (Stone Damage)

Minor
2012-201840,000–120,000 miles£250–£450

The air conditioning condenser is mounted at the very front of the cooling pack, making it highly susceptible to stone damage from the road, leading to refrigerant loss.

Front Anti-Roll Bar Drop Link Wear

Minor
2012-201830,000–80,000 miles£60–£120

The front anti-roll bar drop links wear out on heavily potholed UK roads, causing an annoying knocking sound at low speeds.

Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.