I realize this has been covered numerous times but I need to ask as most of the threads are gone.

I just bought a 03 Z06 today. yay me. it has 22K miles on it and an aftermarket filter which looks like a K&N filter connected to a carbon fiber mount. no other aftermarket parts on the car as far as I can tell.

I drove around maybe 30 minutes and went to get gas. I filled it up to about 3/4 a tank and after I got in and started it I now have a check engine light. the light came on as soon as it started up.

I ran through my DTC codes and all are history except "99 HVAC B0361 H C".


I have read reports of gas caps causing this? is this relevant to my year?

So, is there anyway to clear the check engine light or what should I look at next?

 

If your MIL is on, you have a "Current" code ..... most likely a Powertrain code (Pxxxx) .... scroll through the codes once the diagnostic goes to MANUAL mode.

Go here for instructions if you don't know how to use MANUAL mode .... and you can delete codes in that mode by displaying the code and then HOLDING down the RESET key until the code deletes (about 5 seconds) ....

https://www.corvetteforum.com/techti...D=26&TopicID=1

List ALL the codes, History or Current ..... unless you know the rules for what sets a code to History ... a History code is just as relevant as a Current code.

 

And seeing as how the CEL came on after filling up theres a good chance its the cap. Did you check it?

Find the code.

 

Unlikely it's the gas cap since the only CURRENT code is an HVAC. Clear them all and see if it re-occurs.

 

Sorry for my ignorance but what is a MIL? Malfunction Indicator Light? the only light on is the check engine light.

All the codes listed are as follows:
10 PCM P0171 H
60 IPC U1160 H
99 HVAC B0361 H C
A0 LDCM B2282 H
A0 LDCM B2284 H
A0 LDCM U1064 H
A1 RDCM B2283 H
A1 RDCM B2285 H
A1 RDCM U1064 H

Thank you guys for your time.

 

"Borrowed" from a Z06 Forum thread.......

Heating and Air Conditioning: Testing and Inspection B0361

DTC B0361

CIRCUIT DESCRIPTION
The following DTCs are for the left and right air temperature actuators:
- B0361 and B0363 are for the left air temperature actuator B0365 and B0367 are for the right air temperature actuator

The HVAC control module commands the air temperature actuators to move by controlling the voltage supplied on the control circuit. A signal voltage of 0 volts or a signal voltage of 5 volts rotates the air temperature actuator. A voltage of 2.5 volts stops the door. The HVAC control module determines the current position of the actuator by monitoring the voltage on the signal circuit. The feedback potentiometer is a function of the motor position. The HVAC control module controls the air temperature actuator door positions in order to maintain the selected air temperature.

CONDITIONS FOR RUNNING THE DTC
The ignition is turned ON.

CONDITIONS FOR SETTING THE DTC
The HVAC control module detects the signal circuit is less than 5 counts (0.09 V), for B0361 and B0365, or more than 250 counts (4.9 V), for B0363 and B0367.

ACTION TAKEN WHEN THE DTC SETS
A default value will be used for the sensor data by the HVAC control module in an attempt to maintain the air temperature selected by the driver. This default value will be displayed on the scan tool.

CONDITIONS FOR CLEARING THE DTC
- The DTC will become history if the HVAC control module no longer detects a failure.
- The history DTC will clear after 100 fault free ignition cycles.
- The DTC can be cleared with a scan tool.

PS
A disconnected or broken door may also set this DTC by allowing the air temperature actuator to travel to its internal stops, an overtravel condition.



The P0171 code is more disconcerting as it represents a lean condition in Bank #1. This means the PCM needed to add over 25% additional fuel via the Fuel Trims to maintain the Air/fuel ratio (AFR) it commanded. This is common amongst Z06's that install aftermarket air cold air intakes. The good news is it a History code, so maybe it won't come back. Keep an eye on that one.

Good Luck and keep us posted

Ed

 

The P0171 is what most likely set the MIL (yes, Malfunction Indicator Lamp - the generic term used in the Service Manuals .... some cars it says Check Engine (CEL) and some cars say Service Engine Soon (SES) .... all are a MIL) unless you missed a code ..... which I still suspect.

It means the engine is running excessively lean on the Bank 1 (driver's side) .... you say you added fuel right before it came on .... How low was the fuel ???? The Corvette fuel system does NOT like to be run very low. The fuel is a coolant for the electric pump in the left tank, and exposing the pump can burn it out. There was a recent thread (in the last week or two) of someone who burned out his pump running low on fuel .... cost him over $1,000.00 to have dealer fix the problem.

If you weren't really low on fuel .... check for a leak in the vacuum lines, check for leaks in the intake system between the MAF and the throttle, check for leaks in the exhaust system between the engine exhaust ports and the Heated O2 sensor below the manifold. Also try a bottle of Techron the next time you fill the tank, in case you have a partially clogged injector.

===========================

The B0361 ..... with the engine OFF .... Delete the code .... then remove Fuse 27 (10 Amp) from the Instrument Panel Fuse block. WAIT 2 MINUTES ....... this allows the HVAC controller time to "forget" the actuator positions.

When you replace the fuse you should hear the HVAC "exercising" the actuators to relearn their position.

The Left and Right Door Control Module errors should all be deleted, along with the communication error (Uxxxx) from the IPC.

============================

Check for codes after driving the car for a few minutes. If any have returned, post again and someone can help in further diagnosing.

 

I want to thank all who gave me suggestions as to where I should start. After reading your posts I started looking into the A/C, I reset the codes numerous times and they came right back (the 99 HVAC B0361 H C code) but this time there were two, a 99 HVAC B0361 H C AND a 99 HVAC B0361 H.

So I just start pushing buttons on the A/C...all of them (adjusting the temperature both left and right, fan speed etc...) and it was acting funny, Cold air out of the left vents, hot air out of the right. delete codes again and play with the A/C some more, I went through the codes numerous times during the whole process. Eventually as I was reading the codes there was no longer a C, just 99 HVAC B0361 H. So I started it up and turned it off three times in a row and the check engine light went away!

I been cruising around showing it off most off the day and the check engine light has not came back yet!

Thanks again for your help and the preventative measures so that I don't burn up my fuel pump.

 

HVAC 361 code