View Full Version : P0449 Code


fastsuv
01-09-2009, 06:39 AM
The last few days I have had a solid, steady MIL on on the dash. I have a code reader and the fault is P0449, which is "EVAP emission control system vent vlv/sol Malfunction". I understand what this code is and what it means.

I usually take my out-of-warranty vehicles to a trusted local shop for repairs (too cold to do repairs at home now). My HHR has about 40K miles, so it's out of warranty.

However, since this is an emissions-related failure, isn't the warranty on it much longer than the bumper-to-bumper warranty on the car in general? If it's a covered repair, then I'll take it to the dealer. Otherwise I'll go to the local shop.

Any comments? ChevyMgr?

Thanks in advance

Steve

stephenm
01-09-2009, 07:01 AM
from the trailblazer forum:

THE EVAPORATIVE CONTROL SYSTEM, LIKE ALL EMISSION CONTROL SYSTEMS, IS PROTECTED BY A FEDERALLY-MANDATED WARRANTY (5 YEARS OR 50,000MILES)

which would include the solenoid

ChevyMgr
01-09-2009, 08:05 AM
from the trailblazer forum:

THE EVAPORATIVE CONTROL SYSTEM, LIKE ALL EMISSION CONTROL SYSTEMS, IS PROTECTED BY A FEDERALLY-MANDATED WARRANTY (5 YEARS OR 50,000MILES)

which would include the solenoid

5/50 warranty ended in 1994. Emission warranty is 8/80 and only the catalytic converter and the ECM/PCM are covered.

ChevyMgr
01-09-2009, 08:14 AM
Service Information 2006 Chevrolet HHR | HHR (VIN A) Service Manual | Document ID: 1989855
--------------------------------------------------------------------------------

#PIC4522A: Possible SES Light DTC P0449 And RVS Inoperative - keywords 2.2 2.2L CEL check ECM engine EVAP inop L61 lamp leak leaks line MIL no PCM repeat remote start - (Jun 18, 2007)

Subject: Possible SES Light, DTC P0449 and RVS Inoperative


Models: 2006-2007 Chevrolet HHR
--------------------------------------------------------------------------------
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A condition exist that may cause the SES light to be on and may or may not have a complaint of Remote Vehicle Start (RVS) inoperative. After further investigation you may find a code P0449 stored into the PCM. This code may have set due to the Underhood Bussed Electrical Center (UBEC) having a loose terminal.

Recommendation/Instructions:
It is recommended that you first pull all codes and clear them, if P0449 returns you will want to check the following:

Ignition OFF, disconnect the harness connector at the EVAP canister vent solenoid valve.
Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal A and ground.
If the test lamp does not illuminate, test the voltage supply circuit for a loose connection at the Underhood Bussed Electrical Center (UBEC)
Loosen up the UBEC and inspect Connector 4 Terminal C5 for being backed out.
There have been documented cases where we found a backed out or bent terminal at connector 4 Terminal C5 (RED/WHT 1640) at the UBEC. This of course will cause a loss of voltage (possibly intermittent) to the VENT valve and set the P0449. If the terminal is backed out of the connector, replace the connector (the terminal lock is damaged and the terminal will not lock in place).

Inspect the corresponding male terminal on the UBEC. If there is a bent male terminal it is easy to straighten, using a business card (as a straight edge) and using needle nose pliers, straighten the terminal. Then use the business card again to check terminal alignment. All the terminals should now be aligned together. If you find the male terminal "twisted" then replace the UBEC

If the terminals are straight and are tight then proceed with normal diagnostics.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

************************************************** ******************************
Service Information 2006 Chevrolet HHR | HHR (VIN A) Service Manual | Document ID: 2009711
----------------------------------------------------------------------------------------------------
#07-08-45-003: Intermittent No Start/Long Crank, Start then Stall, Check Engine Light On, Intermittently Functioning or Inoperative Electrical Systems, DTC P0442 or P0449 Set (Inspect UBEC and Replace Connectors) - (Sep 10, 2007)


Subject: Intermittent No Start/Long Crank, Start thenStall, Check Engine Light On, Intermittently Functioning or Inoperative Electrical Systems, DTC P0442 or P0449 Set (Inspect UBEC and Replace Connectors As Necessary)


Models: 2006-2008 Chevrolet HHR

2006-2008 Pontiac Solstice

2007-2008 Saturn SKY

2007-2008 Opel GT

2007-2008 Daewoo G2X




--------------------------------------------------------------------------------

Condition
Some customers may comment about one or more of the following conditions:

• Intermittent no start

• Intermittent extended crank

• Intermittent start then stall

• Check engine light illuminated

• Intermittently functioning or inoperative electrical systems

Upon investigation, the technician may find DTC P0442 or P0449 set as current or in history. These DTCs may also be accompanied by other DTCs.

Cause
4432
4433


These conditions may be caused by poor electrical contact between the underhood fuse block (UBEC) and its connectors. This poor contact may be due a bent or twisted male terminal (as shown above) on the UBEC side. During assembly when the UBEC is bolted to the connectors, the male terminal contacts the edge of the mating female terminal and pushes the terminal (1) out of the cavity. When this occurs, the terminal lock on the connector breaks and the terminal will no longer lock into the connector.

Correction
Remove the UBEC from the connectors. Visually inspect the suspect connector to see if the terminal has been pushed out of its cavity. If the terminal has been pushed out of its cavity, the terminal lock is damaged and connector replacement is required. Also, inspect the terminal for damage and replace if necessary. Straighten the UBEC male terminal (use a business card as a straight edge). If the terminal is twisted, attempt to straighten it using needle nose pliers.

Parts InformationPart Number Description

88988759 Connector, Engine Wiring (C1)

88988756 Connector, Engine Wiring (C2)

19115601 Connector, Engine Wiring (C3)

19115600 Connector, Engine Wiring (C4)

fastsuv
01-09-2009, 01:34 PM
Thanks, ChevyMgr!

I'll check the connections as per your service information this weekend. Fortunately, the car is running fine for now.

Steve

esmarkey
01-09-2009, 01:40 PM
Those pictures are great and as they say "say 1,000 words", are they from the bulletin, or from your shop CM?

ChevyMgr
01-09-2009, 02:07 PM
Those pictures are great and as they say "say 1,000 words", are they from the bulletin, or from your shop CM?

Those come straight off of the TSB. It's amazing how far these have advanced since we no longer get them in paper form, but rather off the GM Global Connect web site.

jer
12-12-2010, 06:48 PM
were is the UBEC located at on HHR ? have the p0449 code would to check terminal ends

Hucko3
08-26-2012, 03:06 PM
where is the UBEC located at on the HHR?

donbrew
08-26-2012, 04:21 PM
where is the UBEC located at on the HHR?

In the description up there it says UBEC (underhood fuse block), you know the large black box that many people think is the battery.:propeller:

Krazy Curt
07-10-2013, 09:29 AM
Still need help

My 2010. I checked all the things Chevy Mgr wrote in that post. I found I have voltage at my connector at the solenoid with the key on or off. is this normal? Turned the check engine light off. I also found out if I turn the key switch on and wait about 10 seconds, to start the engine, the check engine light dose not come back on. What's up with that? It also only happens with less than 1/2 tank of fuel.

dbbrase
02-10-2014, 08:04 AM
I have a 2005 Malibu Maxx LT, 3.5L V6, with this similar problem. Replaced the purge valve, clear code and no problems till the next time I start the car. Is there a similar electrical problem with this engine? Also the remote start quit working in the same time frame.

Oldblue
02-10-2014, 04:14 PM
remote start won't work while there is a code issue and there could be a similar issue with the wire connector , you'll have to have a look!