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Chevy Forum: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236
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  #1  
Old 10-24-2017, 03:00 PM
Jediguy Jediguy is offline
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Default 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

Hi all!

My service engine light has been coming on and then disappearing a few different times over the last few weeks in my 2001 Suburban 1500.

I stopped by the auto parts store and had them read the codes.

I have no idea if this is serious or not. I would be so grateful for an interpretation of what's going on and a best course of action to get things right with my truck.

The Codes are as follows:

P0174: Bank 2 System Lean
P0171: Bank 1 System Lean
P0300: Random multiple Misfire Detected
C0252: Electronic Brake Control Module
C0265: Electronic Brake Control Module Motor Relay Circuit
C0236: Rear Wheel Speed Signal Missing

It would be awesome if these were all issues I could fix myself.

Thank you for any and all input, your perspectives are appreciated.

Matt
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  #2  
Old 10-24-2017, 03:18 PM
zora zora is offline
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Default Re: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

you can check the suggestions what to check for the codes on these sites
https://www.obd-codes.com/p0171
https://www.obd-codes.com/p0174
https://www.obd-codes.com/p0300
https://www.autocodes.com/c0236_chevrolet.html
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  #3  
Old 10-24-2017, 07:22 PM
Jediguy Jediguy is offline
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Default Re: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

Thank you for your response, Zora.

Those links sent me in the right direction.

After reading up on the error codes I did 2 things.

1. I cleaned the air filter, will likely replace it soon and sprayed the Mass Air Flow Sensor with MAF Sensor Cleaner.

2. I replaced the fuel filter, it definitely needed it, all the fuel was black coming out, this truck just crossed the 200,000 mile mark and I wouldn't be surprised if this was the first time it was replaced.

I believe that will help, only time will tell if P0174, P0171 and P0300 come back. My next fill up I'm also going to throw in a fuel system cleaner. Any recommendations? I never use one.

I still don't understand what to do about C0252, C0265 or C0236. I'll do some further investigating. If anyone has any thoughts on those error codes please do share.

That's my current update
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  #4  
Old 10-25-2017, 09:18 AM
zora zora is offline
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Default Re: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

any of the major brand cleaners is fine. Check for broken wires leading to the rear sensors.
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  #5  
Old 11-28-2017, 02:30 PM
Jediguy Jediguy is offline
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Default Re: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

Update:
  • Replaced Fuel Filter
  • Replaced Air Filter
  • Cleaned Mass Airflow Sensor
  • Used Techron Fuel System Cleaner on 1st Fill up
  • Been using Lucas Injector Cleaner with every fill up since.

Error codes persist after clearing the codes:

C0236
C0265
C0245
C0241
C0251
C0246
C0242
C0252
P0171
P0174
P0300
P0171
P0174

The ABS, Parking Brake and Service Engine Soon lights light up often and then disappear.

I am uncertain as to what is causing the misfires.

As far as the ABS and Parking brake light it looks the Electronic Brake Control Module needs some attention. From what I've researched it could just be a ground that needs a more secure connection. I'd like to try that before removing the EBCM itself and resoldering inside.

Only thing is I can't find the ground connection to frame for EBCM.

Can anyone help? I've looked all over the internet.

Of course, any thoughts on the whole scenario are greatly appreciated.

I'm really looking forward to having this truck in proper working order.

Thanks!
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  #6  
Old 11-28-2017, 03:55 PM
zora zora is offline
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Default Re: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

the link I provided in post #2 had a lot more things for you to do to solve the P codes. Checking the O2 sensor would be a good idea https://axleaddict.com/auto-repair/H...-Oxygen-Sensor

did you check the wire harness and test the sensors for the wheels before assuming it's the EBCM?
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  #7  
Old 12-01-2017, 11:54 PM
Jediguy Jediguy is offline
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Default Re: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

Hey thanks! I guess I overlooked some things.

There are two O2 sensors correct? Do I check them both the same way with a voltmeter? I assume they serve different functions so I don't know exactly how to go about it. I read the link you sent and watched the videos.

And the rear wheel sensors, is there an easier way to test those other than jacking up the car and taking the wheels off?

Thanks for your help, sensors are something I've never troubleshooted before so it's a new learning experience for sure.
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  #8  
Old 12-02-2017, 11:11 AM
zora zora is offline
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Default Re: 2001 Suburban: P0174, P0171, P0300, C0252, C0265, C0236

the codes tell you which set of cylinders, P0171 has cylinder #1, P0174 is the opposite bank from #1, and point to the first O2 sensor, the one before the cat. Since both sides show lean start looking for a vacuum leak from a cracked, disconnected/broken hose.
if you can reach the wheel sensors to test resistance without jacking the vehicle up and removing the wheels do it.
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