Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety.


pretty bad
Typical Repair Cost:
Average Mileage:
53,428 miles
Total Complaints:
6 complaints

Most Common Solutions:

  1. not sure (5 reports)
  2. must turn gas cap min 7x when closing (1 reports)
2004 Chevrolet Epica engine problems

engine problem

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2004 Chevrolet Epica Owner Comments

problem #6

Dec 312010

Epica LT V6

  • Automatic transmission
  • 47,846 miles


I bought this car 2 yrs ago and there was nothing wrong with this car except for the engine light coming on and now staying on all the time. It runs great, but now Ontario, as of Jan 2013, has introduced this new e-test computer and of course the car won't pass. My husband is a mechanic and he worked on this for over 4 weeks and, only when his scanner could not go any further, were we forced to go to a GM dealership and, like the comment above, after costing me over $2500 in parts replacement (and over $2000 in labor) nothing has changed. The engine light is still on and now the throttle is acting up even after they put in a new one.

In the last week I have changed out a purge valve, two o2 sensors, the throttle body, 5 wires, and the computer (because, as I was told by the dealership, "the new government computer doing these emission tests could not read the computer in my car.") All of this was to no avail and cost me a fortune in labor fees at over $100/hr.

The dealership had to call the GM engineers in Detroit who told them to put my computer back in and change out the throttle body. They also don't know anything and are fumbling blind. Now the throttle is acting up where it did not before. This has been nothing but a process of elimination by installing every new part the computer codes spit out with no fix in sight. I still have the problem.

I got a conditional pass for 1 yr but as of next March the car will not be plated as per the governments new rules about emissions and going green. My car will be going to the junkyard as it cannot even be sold.

The comment above by Ray of Stony Plains cemented what I already knew - this problem cannot be fixed since the engineers in Korea who designed and built this car are all gone and, with them, their knowledge of their system. This car only has 77,000k on it and is loaded and in mint condition. The new e-test in Ontario reads the entire history of the engine now and 1 out of every 2 cars is failing the emission test. This is not an emission problem. It is a problem between the sensor info being sent to the computer and the computer not being able to read and process the messages. Hence the light stays on. Due to this, I am going to lose a perfectly good car. I am outraged about this. I don't mind paying for something to be fixed but when I have paid and have ended up out of pocket and now, out of a car, and the government won't listen, this makes me furious.

Thanks for your site and allowing us to legitimately vent.

Ispheria G.

- , Ottawa, ON, Canada

problem #5

Jan 082013

Epica LS 3.2L V6

  • Automatic transmission
  • 93,000 miles

Epica is a very good looking car yes! but not good to work on and its not even from NA, don't buy! ITS JUNK

- , Fredericton, NB, canada

problem #4

Jul 212011

Epica LS 2.5L Litre V6

  • Automatic transmission
  • 101,284 miles

Local G.M. dealership told us the oxygen sensor needed to be replaced!! $248 for the part, but because it was in the exhaust manifold they wouldn't be able to get it out to replace it, and we would also have to replace the exhaust manifold. Their estimated cost to replace the one sensor +$1500 ,cannot afford to get another vehicle ,so we are putting up with the problem. Was told it would only get worse if not fixed. Have been a loyal G.M. customer for 40 years but will never buy another vehicle with their name on it. Mr. Good wrench eh, ,what a joke they are!!!! Thanks, I am feeling a little bit better now. Richard

- , Toronto, Ontario, Canada

problem #3

Aug 072008

Epica LS Sedan 2.5L V6

  • Automatic transmission
  • 31,069 miles


To all who are having this problem, it may be as simple as your gas cap not being closed properly?? why not give it a try!! Although, you will need to take your car in to get the engine light taken off. If this is the problem and you continue to close the cap correctly the engine light will not come back on unless it is the engine........promise! It hasn't for me and I make sure my cap clicks

- , Burnaby, British Columbia, Canada

problem #2

May 302007

(reported on)

Epica LS 6 cyl

  • Automatic transmission
  • 22,369 miles

1 The engine light keeps coming on, the engine intermittently hesitates, then takes off like a bat out of hell. We have taken it to several GM dealers but they can not fix it. GM has refused to do anything further and will not replace it.

This will be my last GM. As a Licensed auto tech I think the problem lies in the drive by wire info vs the computers ability to read the info. In other words it is a design problem that GM doesn't know how to fix or true to their history does not want to fix.

- , Stony Plain, Alberta, Canada

problem #1

Oct 042006

(reported on)

Epica LX

  • 25,000 miles

fuel injection not working properly on startup

- , Grenfell, Sask, Canada

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