Skip to content
KickTyres
CriticalCommonCooling

BMW 3 Series: N20 2.0T electric water pump failure (320i/328i)

N20 2.0T electric water pump failure (320i/328i) is a common cooling fault on the BMW 3 Series on the 2012–2016 cars, and we rate it critical. Putting it right costs $500 to $1,300 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 88 documented faults on the BMW 3 Series.

Vehicle
BMW 3 Series
Engine
N20
Years
2012–2016
Fuel
petrol
System
Cooling

This page covers the BMW 3 Series as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All BMW 3 Series faults88 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Water pump yet. We would rather show none than show a picture of a different part.

What goes wrong

The BMW N20 2.0 turbo petrol engine uses an electrically-driven water pump controlled by the DME rather than a belt-driven mechanical pump. The electric motor and impeller assembly fails without warning — commonly between 80,000 and 150,000 km — and causes rapid overheating if the driver does not notice the temperature gauge climbing. Failure is typically complete with no flow rather than progressive. In severe cases an overheating event causes head gasket failure or a warped cylinder head, significantly increasing repair cost.

What you would notice

  • Coolant temperature gauge rising above normal operating range
  • Coolant temperature warning light on instrument cluster
  • Heater output reduced or absent with engine warm
  • Fault code stored relating to coolant pump output (e.g. 2E82)

How to check it

Where to look. Engine bay, lower-front of engine block, coolant circuit

  1. Scan for stored fault codes relating to the coolant pump before purchase.

  2. Check coolant level and condition.

  3. Verify coolant temperature behaviour during a test drive, especially in stop-start traffic.

  4. Ask if the water pump has been replaced — vehicles above 100,000 km without a replacement record should be treated as due for one.

Parts involved: Water pump.

What it costs to put right

$500 to $1,300 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the water pump been replaced?”
  • “Has the vehicle ever overheated or shown a coolant temperature warning?”
  • “Are there any stored engine fault codes?”

Now check the BMW 3 Series you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

BMW 3 Series buyer questions

Is n20 2.0t electric water pump failure (320i/328i) serious on a BMW 3 Series?

We rate it critical and common on the BMW 3 Series. The BMW N20 2.0 turbo petrol engine uses an electrically-driven water pump controlled by the DME rather than a belt-driven mechanical pump. The electric motor and impeller assembly fails without warning — commonly between 80,000 and 150,000 km — and causes rapid overheating if the driver does not notice the temperature gauge climbing. Failure is typically complete with no flow rather than progressive. In severe cases an overheating event causes head gasket failure or a warped cylinder head, significantly increasing repair cost.

How much does it cost to fix on a BMW 3 Series?

$500 to $1,300 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which BMW 3 Series years are affected?

Our research records this fault on the 2012–2016 BMW 3 Series. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Scan for stored fault codes relating to the coolant pump before purchase. Check coolant level and condition. Verify coolant temperature behaviour during a test drive, especially in stop-start traffic. Ask if the water pump has been replaced — vehicles above 100,000 km without a replacement record should be treated as due for one. Look here: Engine bay, lower-front of engine block, coolant circuit