Cadillac DTS Forum - 2006 through 2012 Discussion, check engine light on my 06 dts in Past Cadillac Vehicle Discussion; My check engine light came on and I took it to Autozone to be diagnosed and they came up with ...
My check engine light came on and I took it to Autozone to be diagnosed and they came up with a P0449 code. They say it deals with my (evaporative emission system) purge/vent solenoid circuit condition. Have anyone had this situation before and what should I do to correct this problem, thanks in advance (my caddy family)
Evaporative Emission (EVAP) Vent Solenoid Control Circuit
Battery voltage is supplied to the EVAP canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve by means of an internal switch called a driver. The scan tool displays the commanded state of the EVAP canister vent solenoid valve as ON or OFF. The control module monitors the status of the driver.
Conditions for Running the DTC
The ignition is ON.
The system voltage is between 918 volts.
DTC P0449 runs continuously when the above conditions are met.
Conditions for Setting the DTC
The control module detects that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 12 seconds.
Action Taken When the DTC Sets
DTC P0449 is a Type B DTC.
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the
diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records
Conditions for Clearing the MIL/DTC
DTC P0449 is a Type B DTC.
The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.
It looks like you've gotten some great feedback from other members of the community. What are your plans for getting this checked into? If we can be of any assistance in getting you set up with a dealership in your area (if this was the route you preferred), we're happy to help.
All the best,
Cadillac Customer Care