My check engine light comes on every time I start the car.
Car runs perfect but getting codes as follows:
P 0449 and B 2527.
One code refers to a defective horn circuit or relay. The horn works fine.
The other code refers to some sort of evaporative cannister malfunction.
I've cleared the codes repeatedly but they keep coming back the next time I start the car.
Any guesses??

 

...just a thought, but have you checked your gas cap? If loose, a code will be thrown. The first one IS puzzling.

 

Checked the gas cap first and have filled the tank since getting the code. So I know the cap is tight.
This is a puzzler.

 

This sounds weird but give it a try. Disconnect the battery for a few minutes and then hook it back up. I just fixed my column lock motor problem (It wouldnt lock the wheel) by disconnecting the battery! \

The BCM was not allowing the motor to lock the wheel.

Please let me know if it worked for you!
BC

 

The P0449 indicates there is a problem with the Evap solenoid:
CIRCUIT DESCRIPTION
A voltage is supplied directly to the EVAP Vent valve solenoid. The PCM controls the solenoid by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the controlled component. Each driver has a fault line which the PCM monitors. The voltage of the control circuit should be low (near 0 volts ) when the PCM commands a component ON. The voltage potential of the circuit should be high (near the battery voltage) when the PCM commands the control circuit to a component OFF. If the fault detection circuit senses a voltage other than what the PCM expects, the fault line status changes causing the DTC to set.

CONDITIONS FOR RUNNING THE DTC


The engine speed is greater than 400 RPM .
The ignition voltage is between 6.0 volts and 18.0 volts .
CONDITIONS FOR SETTING THE DTC


The PCM detects that the commanded state of the driver and the actual state of the control circuit do not match.
The conditions are present for a minimum of 5.0 seconds .
ACTION TAKEN WHEN THE DTC SETS


The PCM illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC


The PCM turns the malfunction indicator lamp (MIL) OFF after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A last test failed (current DTC) clears when the diagnostic runs and does not fail.
A History DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
Use a scan tool in order to clear the MIL/DTC.
DIAGNOSTIC AIDS

IMPORTANT:


Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM/TAC modules.
For any test that requires For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents damage to the harness/component terminals. Refer to Using Connector Test Adapters in Diagrams. For an intermittent, refer to Symptoms. See: Diagnostic Information and Procedures\Symptoms
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.


Listen for an audible click when the solenoid operates. Be sure that both the ON and the OFF states are commanded. Repeat the commands as necessary.
This step tests for voltage at the coil side of the EVAP vent solenoid. The ENG IGN fuse supplies power to the coil side of the EVAP vent solenoid.
This step verifies that the PCM is providing ground to the EVAP vent solenoid.
This step tests if a ground is constantly being applied to the EVAP vent solenoid.


And the second one indicates that the anti theft alarm is not seeing the ability to activate the horn: B2527:

CIRCUIT DESCRIPTION
The horn circuit is part of a standard horn system except for the addition of a relay and the BCM providing a control circuit. The BCM can ground the horn relay control circuit in order to energize the relay and turn ON the horns, allowing the horns to be used for Universal Theft Deterrent (UTD) and Remote Function Actuation (RFA) functions. The BCM monitors the voltage level on the horn control circuit. When the BCM commands the relay ON, the voltage level on the control circuit should be low. When the relay is OFF, the voltage level should be high. If the BCM detects a voltage level other than expected, a malfunction is present and a DTC will set.

CONDITIONS FOR SETTING THE DTC


The BCM detects a low voltage level (an open or a short to ground) in the horn relay control circuit.
The BCM can only test for this condition with the horn relay de-energized.
The condition must be present for 2 seconds .
ACTION TAKEN WHEN THE DTC SETS


Stores a DTC B2527 in the BCM memory.
No driver warning message will be displayed for this DTC.
CONDITIONS FOR CLEARING THE DTC


This DTC requires an ignition cycle in order to change from current to history.
The BCM no longer detects a high voltage level in the horn relay control circuit only with the horn relay de-energized.
A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
Use the IPC clearing DTCs feature.
Use a scan tool.
DIAGNOSTIC AIDS


The following conditions may cause an intermittent malfunction:
There is an intermittent open or short to ground in the horn relay control circuit.
There is high resistance in the relay coil.
There is a short to ground in the horn pad.
There are poor connections at the BCM, the underhood electrical center, or the horn relay terminals.
The horn relay is open or shorted to ground internally.
If the horn relay control circuit is shorted to ground, the horn will remain ON at all times. If the horn relay control circuit is open, the BCM may not be able to provide horn control functions, but the horn may still operate correctly depending on where the open circuit is located.
The horn relay may be installed in the I/P electrical center in two directions and still function properly. Refer to Electrical Center Identification in Diagrams for electrical center circuit identification.
If the DTC is a history DTC, the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Intermittents and Poor Connections.
TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.


Listen for an audible click when the Horn relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
Tests for voltage at the coil side of the Horn relay.
Verifies that the BCM is providing ground to the Horn relay.
Tests if ground is constantly being applied to the Horn relay.
Tests for an open in the Horn control circuit.
When the BCM is replaced, use a scan tool to perform the BCM RPO Reprogram procedure. Refer to BCM Programming/RPO Configuration