Need help with codes.....
Thread Starter
Heel & Toe
Joined: Dec 2007
Posts: 18
Likes: 0
Need help with codes.....
Hey guys, so i drive an 02 c5z with 32,000 miles, only mods are a vararam intake and the plug n play hids. Last night my check engine light came on and stayed on, no flashing. Came home, pulled the codes, and these are what i got..... P0171 - Fuel trim system lean bank 1, P1431 - Fuel level sensor 2 circuit performance, B2282 - Battery #1 fault dcm - left, B2284 - Battery #2 fault dcm - left, B2283 - Battery #1 fault dcm - right, B2285 - Battery #2 fault dcm - right, U1064 - Loss of communication with dcm (no soh message recieved-rfa........ i understand the fuel level sensor because my gas guage has been messed up and reading wrong and im tryin to do the fix with techron right now but can you guys help me figure out what might have caused all the rest of these codes????? oh and they all had an H next to them for history. Any help would be much appriciated, thanks!
Supporting Vendor
Joined: Jun 2002
Posts: 1,773
Likes: 155
From: Houston Texas
St. Jude Donor '07-'11-'12
Hey guys, so i drive an 02 c5z with 32,000 miles, only mods are a vararam intake and the plug n play hids. Last night my check engine light came on and stayed on, no flashing. Came home, pulled the codes, and these are what i got..... P0171 - Fuel trim system lean bank 1, P1431 - Fuel level sensor 2 circuit performance, B2282 - Battery #1 fault dcm - left, B2284 - Battery #2 fault dcm - left, B2283 - Battery #1 fault dcm - right, B2285 - Battery #2 fault dcm - right, U1064 - Loss of communication with dcm (no soh message recieved-rfa........ i understand the fuel level sensor because my gas guage has been messed up and reading wrong and im tryin to do the fix with techron right now but can you guys help me figure out what might have caused all the rest of these codes????? oh and they all had an H next to them for history. Any help would be much appriciated, thanks!
Thanks
Steve
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 29
From: San Rafael CA
The P0171 is what set your MIL.
Bottom line you have at least one cylinder running very lean on the driver's side of the engine (Bank 1). There can be several causes for this ...
*An injector is clogged and not supplying enough fuel
* If you were running the engine so that it had a high demand for fuel (WOT at high RPM, for example) and you have a weak fuel pump, that can cause the problem
How long have you had the Vararam installed ??? It is possible for the Vararam to change the air flow through the MAF enough to cause a lean condition. If you've only had the Vararam a few weeks, that's a possibility. If you've had it for several years, it is unlikely to be part of the problem.
Have you done any work in the engine compartment recently ???
Here's the Service Manual steps ... (I'm skipping some because they require a Tech2)
* Visually inspect vacumn hoses for splits, kinks, and proper connections
* Ensure vehicle has more than 10 percent fuel (about 2 gallons) - refuel and clear DTC if less than 10 percent - drive vehicle and see if problem returns
* Check Heated O2 Sensor (HO2S) for proprer instllation and that wiring/connectors are good
* Check for exhaust leaks forward of the HO2S
* Check for vacumn leaks at the intake manifold, throttle body, and injector O-rings
* Check the air induction system for leaks (between MAF and Throttle body)
* Check the AIR system for leaks and for shut-off valves not closing
* Check crancase ventilation system for leaks
After finding the problem be certain to reset the Long Term Fuel Trim value to ZERO
Bottom line you have at least one cylinder running very lean on the driver's side of the engine (Bank 1). There can be several causes for this ...
*An injector is clogged and not supplying enough fuel
* If you were running the engine so that it had a high demand for fuel (WOT at high RPM, for example) and you have a weak fuel pump, that can cause the problem
How long have you had the Vararam installed ??? It is possible for the Vararam to change the air flow through the MAF enough to cause a lean condition. If you've only had the Vararam a few weeks, that's a possibility. If you've had it for several years, it is unlikely to be part of the problem.
Have you done any work in the engine compartment recently ???
Here's the Service Manual steps ... (I'm skipping some because they require a Tech2)
* Visually inspect vacumn hoses for splits, kinks, and proper connections
* Ensure vehicle has more than 10 percent fuel (about 2 gallons) - refuel and clear DTC if less than 10 percent - drive vehicle and see if problem returns
* Check Heated O2 Sensor (HO2S) for proprer instllation and that wiring/connectors are good
* Check for exhaust leaks forward of the HO2S
* Check for vacumn leaks at the intake manifold, throttle body, and injector O-rings
* Check the air induction system for leaks (between MAF and Throttle body)
* Check the AIR system for leaks and for shut-off valves not closing
* Check crancase ventilation system for leaks
After finding the problem be certain to reset the Long Term Fuel Trim value to ZERO
