IsItAGoodCar
Reliability Guide

Common Problems with the
2005 Chrysler 300C

The 300C arrived in the UK in 2005 with the Mercedes OM642 3.0-litre diesel V6 and a 5.7-litre Hemi V8. Early cars had the best equipment but are now the oldest and most likely to show suspension and electrical age-related issues.

What changed for 2005

  • •UK launch with 3.0 CRD diesel and 5.7 V8 Hemi
  • •Mercedes W211-derived suspension
  • •Distinctive American styling

Common MOT watch-outs

  • !Suspension bush and ball joint wear on heavy body
  • !Corroded brake pipes
  • !Inlet manifold corrosion on early diesels (2005–2007)
4
Known Issues
2
Serious
2
Moderate
0
Minor

All Known Issues

Swirl Motor Failure (3.0 CRD)

SeriousEngine

Oil leaks from the turbocharger intake pipe can drip directly onto the swirl flap motor located in the "V" of the engine, causing it to short out and put the car into limp mode.

Est. Repair Cost: £400–£700
Warning Signs:

Limp mode (limited power), Electronic Throttle Control (ETC) light, Engine management light

What to Inspect:
  • Check for oil residue around the turbo inlet
  • Ask if a "resistor mod" or swirl motor bypass has been fitted
Verified by IsItAGoodCar Research Team

Inlet Manifold Corrosion (2005–2007 Diesel)

SeriousEngine

On early 300C diesels, the inlet manifold can corrode internally and suck plastic fragments into the engine, causing potentially catastrophic damage. Cars built between 2005 and 2007 are most affected.

Est. Repair Cost: £400–£1,200
Warning Signs:

Loss of power, Engine management light, Metallic rattling from engine, Engine damage if fragments ingested

What to Inspect:
  • Check if the original inlet manifold has been replaced
  • Ask about any engine damage history
  • Listen for unusual engine noises
Verified by IsItAGoodCar Research Team

Suspension Bush & Ball Joint Wear

ModerateSuspension & Chassis

The 300C is a very heavy car, and its suspension components (derived from the Mercedes W211) take a beating on UK roads. Ball joints and control arm bushes often last less than 40,000 miles.

Est. Repair Cost: £300–£800
Warning Signs:

Knocking over speed bumps, Vague steering, Uneven tyre wear

What to Inspect:
  • Service history for suspension work
  • Listen for knocks during test drive
  • Inspect front tyres for inner edge wear
Verified by IsItAGoodCar Research Team

Alternator Failure

ModerateElectrics & Electronics

The alternator is prone to premature failure, often caused by diesel fuel dripping onto it from cracking rubber fuel hoses. The earth cable can also corrode, leaving the car unable to start.

Est. Repair Cost: £300–£700
Warning Signs:

Battery warning light, Car failing to start, Dimming lights, Electrical glitches

What to Inspect:
  • Check the alternator output voltage
  • Inspect fuel hoses near the alternator for leaks
  • Check the earth cable for corrosion
Verified by IsItAGoodCar Research Team

Buying Tips for 2005 Chrysler 300C

  • Check for inlet manifold cracking on 2005–2007 diesels — fragments can destroy the engine
  • Listen for front suspension knocking over bumps
  • Verify the alternator is charging correctly
2006–2007
Check a 2005 Chrysler 300C by Registration