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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

Subject:Possible SES Light, DTC P0449 and RVS Inoperative

Models:2006-2007 Chevrolet HHR



This PI was superseded to update Recommendation/Instructions. Please discard PIC4522.


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:

  1. Ignition OFF, disconnect the harness connector at the EVAP canister vent solenoid valve.
  2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal A and ground.
  3. If the test lamp does not illuminate, test the voltage supply circuit for a loose connection at the Underhood Bussed Electrical Center (UBEC)
  4. Loosen up the UBEC and inspect Connector 4 Terminal C5 for being backed out.
  5. 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

  6. 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.