Proton Common Problems & Known Faults

How reliable are Proton cars?

Our database covers 3 Proton models and 15 documented faults across the range. Of these, 3 are classified as dangerous and a further 11 as major. Dangerous faults are those that can compromise vehicle safety or lead to complete mechanical failure if left unaddressed.

According to DVSA MOT test data, Proton models fail at an average rate of 29.3%, which is above the 22.7% average across all manufacturers in our database. Reliability varies considerably between models. The GEN 2 is the strongest performer at just 28.5%, while the Savvy has the highest failure rate at 30.5%.

If you are considering a used Proton, researching the specific model and generation you are looking at makes a real difference. The most common failure areas across the range are suspension and brakes, though each model has its own particular weak points. This page gives you a complete breakdown by severity, the models affected, and what repairs typically cost at UK garages.

Proton reliability summary

Where Proton problems occur

Understanding which systems are most prone to failure helps you focus during a test drive or pre-purchase inspection. Here is how Proton's 15 known issues break down by area.

Suspension problems dominate, accounting for 5 of the 15 faults we track (33%). Issues in this area include Suspension component damage or corrosion (GEN2) and Suspension component corrosion (GEN1). The most affected models are the Savvy (3), the GEN 2 (1), the Jumbuck (1).

Brakes is the next most common area, with 4 documented faults (27%). Common faults here include Brake actuator leakage (GEN2) and Handbrake operation failure (GEN2). The most affected models are the GEN 2 (2), the Jumbuck (1), the Savvy (1).

We also track 3 body & rust faults across the range (20%). Problems to watch for include Structural corrosion reducing assembly rigidity (GEN2) and Structural corrosion at mounting points (GEN1). The most affected models are the Jumbuck (2), the GEN 2 (1).

Steering rounds out the top problem areas with 3 known issues (20%). Notable issues include Power steering system leakage or malfunction (GEN2) and Steering rack gaiter failure (GEN1). The most affected models are the GEN 2 (1), the Jumbuck (1), the Savvy (1).

Known Proton faults by severity

Every fault in our database is rated by severity based on its potential safety impact and typical repair cost. Below is a sample of issues at each level, with links to the affected model pages where you can read the full details.

Top issues across the Proton range

The most common and severe problems found across all Proton models, ranked by severity and how many models are affected.

Problems by Proton model

We track faults across 3 Proton models. Each model page includes every known issue, generation-specific details, UK repair costs, and MOT failure data. Select a model below to see its full breakdown.

What to check before buying a used Proton

Every used Proton deserves a thorough inspection, but knowing the common weak points for your target model gives you a serious advantage. Since suspension faults are the most common across the range, pay particular attention to this area during any viewing or test drive.

The 3 dangerous-rated faults deserve special attention. These include Structural corrosion reducing assembly rigidity (GEN2), Structural corrosion at mounting points (GEN1), Brake pipe corrosion (GEN1). Any of these can compromise safety or result in repair bills running well into the thousands.

A complete dealer service history is one of the strongest indicators of how well a Proton has been looked after. Many of the faults on this page are preventable or can be caught early through regular servicing. If the seller cannot produce service records, treat that as a significant red flag.

Check the MOT history carefully too. With a 29.3% average failure rate across the Proton range, some advisories and minor failures are normal over the life of any car. What matters is the pattern: recurring failures in the same area suggest an underlying problem, while a history of clean passes is encouraging.

Proton repair costs: what to expect

Across all documented faults, the average Proton repair costs between £285 and £700 at an independent garage. At the top end, the most expensive single repair can reach £2,000 or more. Main dealer rates are typically 30% to 50% higher across the board.

The single most expensive Proton repair in our database is Structural corrosion reducing assembly rigidity (GEN2), which can cost £800–£2,500 at a main dealer.

These figures are based on reported UK repair costs and serve as a guide. Actual prices will vary depending on your location, the garage, and the parts required. Getting quotes from two or three specialists before committing to any major work is always worthwhile.