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Hyundai Elantra: Nu/Gamma Timing Chain Tensioner Cold Rattle

Nu/Gamma Timing Chain Tensioner Cold Rattle is a common engine fault on the Hyundai Elantra on the 2011–2015 cars, and we rate it major. Putting it right costs $600 to $2,200 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 30 documented faults on the Hyundai Elantra.

Vehicle
Hyundai Elantra
Years
2011–2015
Fuel
petrol
System
Engine

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

All Hyundai Elantra faults30 documented faults on this model

What you are looking at

The front of a dual overhead camshaft engine with the timing cover removed, exposing the timing chain and sprockets.Example of the part — not this vehicle

The front of a twin-cam engine with the timing cover off — chain, sprockets and guides.

Logansenf · CC BY-SA 4.0 · Wikimedia Commons

What goes wrong

The hydraulic timing chain tensioner on Nu (G4NB) and Gamma (G4FC/G4FG) engines loses oil pressure overnight, causing chain slap and audible rattle for the first 5-30 seconds of a cold start until oil pressure recovers. Prolonged rattle over time causes chain stretch, timing deviation and poor running. Advanced cases risk the chain jumping a tooth, causing valve-to-piston contact and catastrophic engine damage.

What you would notice

  • Metallic rattling or chattering from top of engine on cold start clearing within 30 seconds
  • Rattle more pronounced in cold weather or after the car sits overnight
  • Check engine light with timing correlation codes P0016 or P0017
  • Rough idle or misfires after an extended cold-start rattle period
  • Rattle worsening after oil change with incorrect viscosity

How to check it

Where to look. Front upper engine - timing chain tensioner and upper chain guide behind cam cover

Cold-start the engine first thing in the morning and listen immediately for a metallic rattle from the top front of the engine. Confirm it clears within 30 seconds as oil pressure builds. Connect an OBD2 scanner and check for stored or pending cam-crank timing codes. Verify correct oil viscosity was used and that oil is not overdue for a change.

Parts involved: Timing chain.

What it costs to put right

$600 to $2,200 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

  • “Does the engine make a rattling noise on first start of the day?”
  • “When was the last oil and filter change and what grade was used?”
  • “Has a mechanic ever mentioned the timing chain or tensioner?”
  • “Has the car had any check engine lights related to engine timing?”

Now check the Hyundai Elantra 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.

Hyundai Elantra buyer questions

Is nu/gamma timing chain tensioner cold rattle serious on a Hyundai Elantra?

We rate it major and common on the Hyundai Elantra. The hydraulic timing chain tensioner on Nu (G4NB) and Gamma (G4FC/G4FG) engines loses oil pressure overnight, causing chain slap and audible rattle for the first 5-30 seconds of a cold start until oil pressure recovers. Prolonged rattle over time causes chain stretch, timing deviation and poor running. Advanced cases risk the chain jumping a tooth, causing valve-to-piston contact and catastrophic engine damage.

How much does it cost to fix on a Hyundai Elantra?

$600 to $2,200 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 Hyundai Elantra years are affected?

Our research records this fault on the 2011–2015 Hyundai Elantra. 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?

Cold-start the engine first thing in the morning and listen immediately for a metallic rattle from the top front of the engine. Confirm it clears within 30 seconds as oil pressure builds. Connect an OBD2 scanner and check for stored or pending cam-crank timing codes. Verify correct oil viscosity was used and that oil is not overdue for a change. Look here: Front upper engine - timing chain tensioner and upper chain guide behind cam cover