: check engine light on my 06 dts



Caddy-Lee
05-13-13, 09:56 AM
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)

Superjim
05-13-13, 12:38 PM
Possible causes
- Vacuum leaks, damaged hoses or improper routing
- EVAP system - Check fuel cap, canister, valves or components
- Faulty purge or vent solenoids
- Check connector and wiring
- Fuel saturated vapor canister
- Failed EVAP vent solenoid

danog
05-13-13, 06:38 PM
DTC P0449

Evaporative Emission (EVAP) Vent Solenoid Control Circuit

Circuit/System Description

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.

Cadillac Cust Svc
05-15-13, 07:35 PM
Caddy-Lee,
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,
Sarah
Cadillac Customer Care