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I purchased our 2014 Cruze diesel brand new from a local dealership. Everything was great until the vehicle O2 sensor recall/recalibration was done with under 10k on the vehicle. Since then, my mileage dropped significantly(averaging between 18-20mpg, with full tank range consistently indicating less than 350 miles). I also experienced a significant loss in power and driveability, with the vehicle lagging upon acceleration, and intermittent shifting issues. I have had it into the dealership several times, and they have repeatedly told me they can find nothing wrong. They also told me the poor mileage sometimes just happens! I am thoroughly frustrated with the situation, as the vehicle still has under 50k on it, and I really like(d) the power and mileage the vehicle had when I first bought it. Any feedback or suggestions on a remedy are greatly appreciated, and if I can’t find an answer I’m likely going to use it as a trade in on another vehicle before I start having costly repair bills to keep it on the road!
 

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Hopefully you have documentation of your visits. Have you directly contacted GM Support with complaints? I don't drop below 30MPG even when I am stop and go around town.
 

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I purchased a new 2014 CTD in November 2013 and within a few days began to receive numerous codes regarding emissions problems including DEF tank, fluid quality, tank heater, bad sensors etc. After numerous trips to the dealer requiring 34 days and numerous parts replacement the car continued to throw codes and had poor economy.

I finally found this forum and printed a GM technical instruction for updating the emissions software. I provided the software instructions to the dealer, who reflashed the computer. This fixed all the problems and improved fuel economy about 20%. I've had no additional problems with the car and love it.

The dealer employees seemed oblivious to the difference between a diesel and gas Cruze. For example, the salesman who sold the car wasn't familiar with the glow plug ignition and the mechanics always deflated the special diesel tires to the lower gas inflation instruction. I believe that there was never anything wrong with the parts that were replaced. Why would so many faulty parts be installed on a brand new vehicle emission system? I estimate that the unnecessary warranty repairs would have cost about $5,000.

I now place a card on the dash explaining that the car is a diesel when it is serviced. This prevents damage from clueless technicians caused by inadequate GM training.
 

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Hey guys, I have a 2014 Cruze Diesel with 109k. Having Poor quality exhaust fluid issues. Already had it too the dealership 2 times, they claimed they replace the tank, heater and the pump. A week later started getting the same message again. Now all I get from ppl is that the DEF system is junk get rid of it and buy a new car. I ve also been told to just bypass the system, but I don't have a clue what to do there. I love this car, I don't want to get rid of it. Little advice goes along ways.....
 

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Hey guys, I have a 2014 Cruze Diesel with 109k. Having Poor quality exhaust fluid issues. Already had it too the dealership 2 times, they claimed they replace the tank, heater and the pump. A week later started getting the same message again. Now all I get from ppl is that the DEF system is junk get rid of it and buy a new car. I ve also been told to just bypass the system, but I don't have a clue what to do there. I love this car, I don't want to get rid of it. Little advice goes along ways.....
I don't want to speak for @revjpeterson but is this the NOX sensor #2 issue?
 

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I don't want to speak for @revjpeterson but is this the NOX sensor #2 issue?
NOX2 would be the most likely cause. Could also be a problem with the DEF injector, clogged DEF line, or some other more obscure causes.

Sounds like the dealership either just threw parts at it and didn't properly follow diagnostic procedure, or they skipped doing the computer reset after replacing the parts.

Could either play the odds and throw a NOX2 on it, or find someone who will fully go through the diagnostic steps first.
 

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Hey guys, I have a 2014 Cruze Diesel with 109k. Having Poor quality exhaust fluid issues. Already had it too the dealership 2 times, they claimed they replace the tank, heater and the pump. A week later started getting the same message again. Now all I get from ppl is that the DEF system is junk get rid of it and buy a new car. I ve also been told to just bypass the system, but I don't have a clue what to do there. I love this car, I don't want to get rid of it. Little advice goes along ways.....
I hope you got this fixed. If not, I would be willing to buy the car from you.

Your best bet is to refer to Surreal Development’s General Motors Emissions Diagnostic Guide to resolve the issue(s).

I thought I had a NOx sensor problem which triggered a speed limit countdown, but what fixed it was performing the DEF Fluid Quality Test which included a regen.

Just my two cents: F%&# the dealer! I am guessing they suck where you live just as much as they do where I live. Save yourself thousands of $$$ and the frustration and fix it yourself with a OBDLINK LX module and Gretio subscription. That is what I did, and I am so thankful for this community for helping me get back on the road with my 2014 CTD with almost 160k miles on it now. It is running better than ever!
 

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That is the year of my Chevy Cruze Diesel. If I had it all to do over again, I would NOT purchase a Chevy Cruze Diesel, again. As it is, I'm out of warranty, and out of luck, when it comes to all these **** emission sensors throwing CEL codes. Buyer beware.
Like most diesels these days with aftertreatment systems, you can't expect flawless durability with low duty cycle and/or a majority of city driving. I only started having problems with mine once the pandemic hit and I stopped traveling as much for work on the interstate. The key is to use it for long-distance travel as much as possible. That is where my baby shines with unrivaled superior performance.
 

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Like most diesels these days with aftertreatment systems, you can't expect flawless durability with low duty cycle and/or a majority of city driving. I only started having problems with mine once the pandemic hit and I stopped traveling as much for work on the interstate. The key is to use it for long-distance travel as much as possible. That is where my baby shines with unrivaled superior performance.
Same here. I got the NOX2 code after weeks of no freeway driving when covid first hit. After I got back on the freeway the light went out and haven't seen it again (just about 2 years ago).

CTD are awesome if you can put 50-100 miles a day on it (which I do). For other people (weeks of city/short trips only) I would also agree to not recommend it.
 

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Not sure if this is the right place to post but I had all the same issues i'm seeing here before I bought the TriFecta tune. Please trust me that I'm NOT advocating or endorsing the company, only offering personal experience. I burned the traditional NoX1 and NoX2 sensors twice under warranty and never since....
I still burn up a DEF heater every 30K since I bought the car new... other than that, I've experienced none of the issues I see regularly expressed here. The tune is completely emissions compliant with both states i've resided in, Washington and Idaho, and has produced no negative effects on my driving or maintenance.
My 2014 2.0 was purchased new in 2016 and the TriFecta tune is the only modification (not installed till 2021). I've had the sunroof glass recalled, the DEF heater replaced 3x under warranty, the steering rack replaced for lack of return to center issues, from new (later proven to be tire issue caused by factory tires, after extensive dealer and manufacturer effort, credit to them), and learned the hard way that 4.8 QTS really means NOT 5QTS(at the dealer thankfully) only manual regen required so far.
Fuel mileage is subjective based on use and conditions. Do NOT expect a gain in MPG. My personal driving habits are somewhat aggressive and lead to accelerated wear due to cornering forces. My experience has proven that increased power usage negated any possible MPG gains but driving same said vehicle daily offered a more than favorable driving experience vs fuel consumption. Other drivers may see different results, because... reality... more power requires more fuel, duh. I guess I mean to say that any increased efficiency was lost on me due to my appreciating the improved engine performance... which I enjoy regularly.
 
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