I have a 2017 Chevy Silverado V8 5.3L with just over 103,000 miles on it. A few weeks ago I was getting the following codes P0300, P050D, P219A and P0172/P0175. I replaced both the spark plugs and spark plug wires as it looked like they had not been changed by the previous owner. Since doing so, the check engine reappeared a couple days later and this time only showed the P219A code which is a fuel trim cylinder bank 1 error code. I do not notice any performance or drivability issues with my truck. It is tough to tell on fuel efficiency since I mainly am in the city (35 mph speed limit) most of the time.
Mechanic that replaced my spark plug wires does not think it is a faulty coil or injector otherwise it would be a different code. He thinks it is likely a vacuum leak or possible faulty oxygen sensor. Wanted to see if anyone here had same problem or could suggest what it could be. Also, is it safe to drive on this code until I can get it fixed? Thanks.
are you referring to the wiring on the sensor itself?
The wires run from the sensor all the way back the computer up front. There could be a fault anywhere along that wire or in the multiple connectors and ground connections along the way.
If so, how would one go about fixing that issue?
The way you locate the problem is by using tools like a multi-meter , scope, and diagnostic scanner, and probing for signals, measuring voltages/resistance, and using an electrical schematic as a guide.
Did the mechanic look for exhaust leaks?
Here are the OEM diagnostic troubleshooting steps for P219A
P050D is often caused by faulty fuel injectors, and would also trigger your other codes. An injector balance, and leakdown tests could be performed. Any mechanic worth his salt can do this. The mechanic also should have obtained misfire counts for every cylinder to help narrow down the problem.
https://www.youtube.com/watch?v=m7Y9uVa-89E
@imperator To my knowledge he ran a smoke test and did not see any vacuum or exhaust leaks. Regarding injectors, he told me that he was not getting any indication that of them were faulty based on the tests he was doing. He said he would shut one off at a time to see if there were any differences but none were detected. Again, not a mechanic and have to take his word for it to a degree.
Also, I saw something about it takes a certain number of drive cycles for the computer to reset itself and turn the light off. Is this a common thing and something that could apply to my situation? He just replaced that sensor two days ago so I have gone through less than 10 drive cycles since.
Well if it runs okay you can certainly drive it that way. It's not going to be an oxygen sensor because that would affect all the cylinders on one side of that engine, not just one cylinder. I don't know if you're the original owner or not. If you aren't and it had been wrecked or flooded, it would generally be a problem and either corroded wiring or damaged to the computer driver circuits. If you're anywhere near Clarksville, Tennessee, I'd check them out free during the week guys and I'd gladly do it in person with all my equipment
@scottykilmer all the code says is bank 1 so I am unsure of how many cylinders it is affecting. I am not the original owner so not sure if/when an oxygen sensor, MAF sensor have been replaced. Mechanic is going to do a smoke test to see if he can detect a vacuum leak exists. If it is not an oxygen sensor, what do you suggest to test next?
Updating my previous post as I still have my CEL light on and seeing if anyone can help narrow down the issue.
ORIGINAL POST - I have a 2017 Chevy Silverado V8 5.3L with just over 103,000 miles on it. A few weeks ago I was getting the following codes P0300, P050D, P219A and P0172/P0175. I replaced both the spark plugs and spark plug wires as it looked like they had not been changed by the previous owner. Since doing so, the check engine reappeared a couple days later and this time only showed the P219A code which is a fuel trim cylinder bank 1 error code. I do not notice any major performance or drivability issues with my truck. It is tough to tell on fuel efficiency since I mainly am in the city (30 mph speed limit) most of the time so maybe that has taken a bit of a hit.
UPDATE - When taking it to a shop, mechanic ran a smoke test and could not detect any vacuum leaks. He cleaned out my MAF sensor as well. Said he did not notice any outliers on the data related to fuel injectors but could not be 100% sure they were fully functioning. When testing my 4 oxygen sensors, one on Bank 1 was operating way differently than the other 3. This made since to me since my P219A code was an imbalance on Bank 1. We replaced that sensor but the light reappeared a day later. Going to have it scanned again to see what code(s) appear. Anyone have some insight into what the issue could be? Thanks
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We replaced that sensor but the light reappeared a day later
if it's not the sensor, then it could be the wiring. Mechanic should have tested for that first.
@imperator I am not a mechanic obviously so forgive me, but are you referring to the wiring on the sensor itself? If so, how would one go about fixing that issue?
I have gone through less than 10 drive cycles since.
drive cycles are for inspection readiness monitors.
Each of the following represents ways to clear an I/M Test DTC:
*If the MIL goes out due to 3 passing drive cycles, scan tool code clear is not used, the I/M Test DTC is erased at power down of the last drive cycle.
...
For the OBD II System to run a single drive cycle for clearing an I/M Test DTC, all of the following conditions must occur:
*Cumulative time of engine run time is greater than 600 s.
*Cumulative vehicle operation above 41 km/h (25 mph) for over 300 s.
*Continuous vehicle idle for greater than 30 s.
*Turn ignition OFF for 5 s and allow the code to clear.
Is this a flex fuel vehicle?
@imperator Yes it technically is but I never put that type of fuel in it. I always put in the standard unleaded with up to 10% ethanol.
Doesn't matter. Use a scan tool to check the alcohol content in the fuel system diagnostics.