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Common Issues and Fixes for 2014-2015 Cruze Diesel

50109 Views 31 Replies 18 Participants Last post by  BDCCruze

I finally got around to putting this together. Please post any corrections/additions below. I am going for common issues here, not things that just pop up once randomly.

Symptoms: Could be a DEF Quality poor message (P20EE) but usually a code (P21DD) for the DEF heater. Sometimes these messages are related to each other. The P21DD is more definitive.
Solution - DEF Tank Reservoir Heater – Replacement part number 23377881 (replaces 22978800). Update: In my case, it gave the DEF quality poor message but the CEL never actually lit up. You can also get a P20B9 code, but that usually only comes after one of the other codes or the def quality poor message have already reared their heads. There is an extended warranty on this 10years 120K miles. Note that it can take up to 100 miles after replacement for the error to clear!

Symptom: P0133 code (O2 sensor bank one slow response)
Solution: Most commonly there is a fuel trim update that can be done to prevent the sensor from getting sooted up in the first place. Sometimes it's not necessary to replace the sensor. You can get away with just cleaning it. Could also be caused by a few other things. Some have reported that issues with the EGR or EGR plate could cause this. Others have reported that loose intake clamps could cause this. (See post below for more details).

Symptom: Pop sound followed by loss of power, rough running, strong smell of diesel fumes, visible smoke. Check engine light may or may not appear. Note: So far this has only happened on cars with over 150K miles.
Solution: Most likely your intercooler pipe has cracked. Top, right, rear of the engine as you facing the car. Part number is 95472182 for the intercooler pipe. Some have reported this also causing damage to other related components, but only with extended driving in the broken condition.

Symptom: P20E4 code (Exhaust Gas Temperature Sensor 2/3 Correlation Bank 1)
Solution: Further diagnosis must be done to determine if it’s sensor number 2 or number 3 causing the issue. EGT3 Part number is 55581034 and EGT2 is 55581035

Symptom: Your car displays a message that says “DPF Full Keep Driving” (or something like that) followed by “Engine Power Reduced”. Most likely you have interrupted a “pre-regen”.
Solution: Unfortunately, you will need to go to the dealer for a manual DPF regen. See this post for how to prevent:

Symptom: P11D7 NOx Sensor 2 Performance - Sensing Element Status Signal
Solution: Replacement of the NOx sensor, but sometimes the code will clear itself. This can also be caused by the exhaust flange bolt mentioned below. Some good info in post 46 here:

Symptom: Any number of random codes
Solution: The exhaust flange bolts under the middle of the car are prone to corrosion and snapping off. Getting these replaced along with the gasket as a preventative measure is a good idea, mainly if you live in a northern climate where salt is used on the roads. Procedure to fix is here:

Symptom: Any number of random codes
Solution: A common issue is that the intake hose clamps work themselves loose over time (or come loose from the factory) allowing for unmetered air. Procedure to check is here:

Symptom: Failure to start, any number of weird electrical gremlins, failure of transmission to shift out of 1st gear
Solution: Most likely, it's the battery. The factory battery only seems to last about 2 years in these cars. Another thing, if you've not had your negative battery cable replaced, do so. It's an extended warranty item up to 10 years, 120K miles. More about the cable is here:

Symptom: P11DC after the NOx Sensor 1 and reprogram emissions recall. The theory is that the parameters set in the ECU reprogramming are too tight and throw a P11DC code which isn't really a valid code. This can also cause DEF Quality Poor message. More info here:
Update on the above - the recall has been recalled. More info here:
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· Reverend Red Bull
1,154 Posts
Oops, I see that now. Can you (or anybody) help me with the right p/n?
Not totally sure which is which, but this is what Rock Auto shows.
I will add an update that there is an issue with the part numbers until it gets sorted out.
If you go to the sensor number and location thread, it's been sorted out and those numbers are now correct. I had started that thread using the RockAuto catalog info mentioned above, after which we noticed the discrepancy between their part numbers and the ones on several dealer work orders for EGT3 (reversing the part numbers for EGT2 and EGT3). During a repair to his vehicle, Danny5 photographed the part number from his factory-installed EGT2 to verify the correct numbers, and I updated the post accordingly there.

So... EGT3 is 55581034 and EGT2 is 55581035 - which means the RockAuto descriptions are either reversed or poorly worded. It's also a counter-intuitive conclusion, because GM's usual convention is for sensors with sequential part numbers, which correspond to sequential sensors in a system, to be numbered in parallel ascending order. (See, for example, the NOX sensors for our vehicle, where both the old pair of NOX sensors and the updated pair of NOX sensors follow this convention in their part numbering.)

· Reverend Red Bull
1,154 Posts
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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