CAR OBD CODES
OBD/DTC Search, e.g.P0443
CAR OBD CODES P0443
P0443 OBD Code Definition:
P0443 EVAP Canister Purge Valve Circuit Malfunction
P0443 OBD Code Description:
OBD2 Code P0443 Definition:
The Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter the engine to be burned, rather than vented into the atmosphere as an emission. The purge valve solenoid is supplied switched battery voltage. The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn’t activated, the ECM should see a high voltage on the ground circuit. When the solenoid is activated, the ECM should see the ground voltage pulled low, close to zero. If the ECM doesn’t see these expected voltages, or senses an open in the circuit, this code is set.
Symptoms
Possible sumptoms of P0443
P0443 trouble code symptoms could be just an malfunction indicator lamp (MIL) illumination. There may be no drivability problems at all. But, it’s also possible to have a lean condition or a rough running engine if the purge valve is stuck open. Usually though, these symptoms are accompanied by other EVAP codes. Another symptom may be excessive pressure in the gas tank in the form of a “whooshing” sound when the cap is removed, indicating a purge valve that isn’t working at all or stuck closed.
Possible Causes
Possible causes of P0443
To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following: CIRCUIT Bad purge solenoid (internal short or open) Wiring harness chafing or rubbing another component causing short or open on control circuit Connector worn, broken or shorted due to water intrusion Driver circuit inside powertrain control module (PCM) is bad
Possible Solutions
1. Using a scan tool, command the purge solenoid to activate. Listen or feel for a clicking coming from the purge solenoid. It should click once, or on some models it may click repeatedly. 2. If it doesn’t click with scan tool activation, unplug the connector and examing the solenoid and connector for damage, water, etc. Then check for battery voltage on the feed wire with the key on. If you have battery voltage, then ground the control side manually using a jumper wire and see if the valve clicks. If it does, then you know the solenoid is working properly but there is a problem with the control circuit. If it doesn’t click when you manually ground it, replace the purge solenoid. 3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you’re unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. You’ll need a new ECM. However if it doesn’t click, then there must be an open in the wiring between the ECM and and the solenoid. You must find it and repair it. OBD-II Codes
P0440 P0441 P0442 P0446 P0453 P0455 P0456
Note: The information on the P0443 error code is purely informative, if you need more useful information, please consult your technician.
B1836 B1005 B259F B1154 B1208 B2887 B1006 B11C8 B1983 B2952 B1942 B1439 B2192 B1680 B1535 OBDII Chassis Codes
C1837 C0020 C1A63 C0089 C1448 C2784 C2006 C0266 C1286 C276C C101D C0710 C1A20 C1011 C1794 OBDII Network Codes
U1019 U1163 U1117 U1090 U2021 U0101 U2195 U0119 U2520 U0429 U0221 U2010 U0461 U1184 U1114 OBDII Powertrain Codes
P0C0D P1679 P1245 P0A9F P0247 P132A P1510 P268B P0A1C P20EE P141B P2452 P1782 P22A9 P0400