Rwayne
Member
My engine light has been coming on and off for the past 2 weeks and one of my buddies ran the code and it looks like some sort of evap code?!? Anyone had the same issues and had them fixed? Any help, always appreciated!
Trouble Code 443
- Thread starter Rwayne
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
BlizzardX23
Full Access Member
whats the full code? its more then just 443...if you get the full code, we can google it
OP
OP
Rwayne
Member
P0443 sorry
BlizzardX23
Full Access Member
"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."
- http://www.obd-codes.com/p0443
try listening for that when you remove your cap?
- http://www.obd-codes.com/p0443
try listening for that when you remove your cap?
Last edited:
OP
OP
Rwayne
Member
i'll pull it off after my drive to work tom, Thanks blizzard
joes 00 Hoe
Full Access Member
^^^OBD-Codes.com ???^^^ I had this same problem, it was just my gas cap! Bought a new one @ Auto-Zone for like $13, and haven't had it come back on....this was 2 years ago!!
DTC P0443
Circuit Description
The evaporative emission (EVAP) purge valve is pulse width modulated (PWM). The powertrain control module (PCM) controls the EVAP purge valve duty cycle by controlling the amount of purge valve ON time. The scan tool displays the amount of ON time as a percentage.
An ignition voltage is supplied directly to the EVAP purge valve. The PCM controls the EVAP purge valve 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. The PCM monitors the status of the driver. If the PCM detects an incorrect voltage for the commanded state of the driver, diagnostic trouble code (DTC) P0443 sets
Circuit Description
The evaporative emission (EVAP) purge valve is pulse width modulated (PWM). The powertrain control module (PCM) controls the EVAP purge valve duty cycle by controlling the amount of purge valve ON time. The scan tool displays the amount of ON time as a percentage.
An ignition voltage is supplied directly to the EVAP purge valve. The PCM controls the EVAP purge valve 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. The PCM monitors the status of the driver. If the PCM detects an incorrect voltage for the commanded state of the driver, diagnostic trouble code (DTC) P0443 sets
OP
OP
Rwayne
Member
Man I went to get a cap from auto zone today, I didn't like the fact that it wouldn't be attached to the yuk so i'm gonna try and grab one tomorrow or something from the dealership. The one at Autozone was only 8 bucks though, i weigh my options.
OP
OP
Rwayne
Member
Well I went to my neighbors shop a while back to have him test my cap b4 I went to the dealership for the 21dollar cap. It turned out that it was bad so I bought one and had the codes cleared. Well its back on so I guess ill be replacing a purge valve soon. Anyone have any experience with this?
OP
OP
Rwayne
Member
Ok so after months of putting up with the engine light code I'm finally getting the wooshing sound you were talking about blizzard. It doesn't sound good at all so I'm trying to detemine how to do this. My friend says the dealership sells the part but recommends a relocAtion kit. I think the kit is an extra 70 bucks or so.. Anyone dealt with this issue?!?
OP
OP
Rwayne
Member
Anyone?
AnonEMouse
TYF Newbie
- Joined
- Sep 12, 2010
- Posts
- 1
- Reaction score
- 0
I've been having this same problem and it's driving me nuts! P0443 & P0449 were setting and I got the TIGHTEN GAS CAP warning and MIL was illuminated. Replaced the gas cap....That wasn't it. Checked and replaced the EVAP cannister vent solenoid (it was bad) next. P0443 stopped happening but P0443 wouldn't go away. Next replaced the EVAP purge solenoid valve (TWICE!!!)....Still, P0443 won't stop setting and MIL is on. The computer is indeed actuating the vent solenoid and the solenoid is working. Even still, the computer/ECM must not be sensing that it is working and/or there is a faulty MIL.
So, what could it be of there is nothing actually wrong (all the valves/solenoids working, no vacuum leaks, cannister is fine), yet it keeps setting P0443 and the MIL???? What constitutes a faulty MIL???
So, what could it be of there is nothing actually wrong (all the valves/solenoids working, no vacuum leaks, cannister is fine), yet it keeps setting P0443 and the MIL???? What constitutes a faulty MIL???
DESSKI
Member
Been getting this same P0443 code and its been frustrating. I've been told its the wiring that routes to the EVAP solenoid on top of intake manifold but it seems okay. I've yet to try the gas cap but will after a fill up.
SLCHOE
ASE Master Certified + (L1)
With the key on engine off, check for 12 volts at the purge solenoid connector pink wire (disconnected).
If good, check resistance across the two pins of the solenoid. Should be 20 to 30 ohms if I recall correctly.
Number one in the pic is the solenoid connector. You need to remove the plastic engine cover to get to it.
For those that care I'll expand a bit:
Whenever you see a code that idicates "circuit" like this one does (P0443 - Evaporative Emission Control System Purge Control Valve Circuit) this means the ECM has detected a bad reading on the circuit meaning it can be an internal sensor fault or wiring issue (and very rarely a driver issue within the ECM itself). So a circuit issue is never going to be a loose or even bad gas cap. Gas cap codes are usually EVAP leak codes using the positions of the purge and solenoid valves against the fuel tank pressure which is also monitored in EVAP systems.
This code indicates the PCM was expecting to see a certain voltage on a wire and it didn't see that voltage. In fact it was out of it's normal operating range of voltages that were within the normally functioning range of voltages (which doesn't happen unless there is an electrical issue). Most 3 wire sensors operate within a .5V to 4.5 volt range normally. An open/broken wire would cause the voltage to reach the PCM at 5.0 volts. A shorted wire would show 0 volts (this can flip flop depending on if the control side is power or ground side switched). This is how the PCM knows there is a circuit issue.
If good, check resistance across the two pins of the solenoid. Should be 20 to 30 ohms if I recall correctly.
Number one in the pic is the solenoid connector. You need to remove the plastic engine cover to get to it.
For those that care I'll expand a bit:
Whenever you see a code that idicates "circuit" like this one does (P0443 - Evaporative Emission Control System Purge Control Valve Circuit) this means the ECM has detected a bad reading on the circuit meaning it can be an internal sensor fault or wiring issue (and very rarely a driver issue within the ECM itself). So a circuit issue is never going to be a loose or even bad gas cap. Gas cap codes are usually EVAP leak codes using the positions of the purge and solenoid valves against the fuel tank pressure which is also monitored in EVAP systems.
This code indicates the PCM was expecting to see a certain voltage on a wire and it didn't see that voltage. In fact it was out of it's normal operating range of voltages that were within the normally functioning range of voltages (which doesn't happen unless there is an electrical issue). Most 3 wire sensors operate within a .5V to 4.5 volt range normally. An open/broken wire would cause the voltage to reach the PCM at 5.0 volts. A shorted wire would show 0 volts (this can flip flop depending on if the control side is power or ground side switched). This is how the PCM knows there is a circuit issue.
Last edited:
Timdenn180
TYF Newbie
- Joined
- Mar 8, 2023
- Posts
- 20
- Reaction score
- 2
Hey I know it’s been awhile since this post but were you able to figure it out? The p0443 code??? I am having the same issue and have replaced canister,vent valve, and purge valve. Still have the code and help would be greatly appreciated
MassHoe04
Full Access Member
P0443 is specific to the purge valve and indicates a problem with the circuit.
Inspect wires and the connector to make sure they are not broken or damaged.
Since you replaced the purge valve, maybe there is a chance the connector was just not plugged in solid. Pull out the harness connector, spray down with electrical contact cleaner spray and try snapping it back in.
If that doesn't work, maybe damaged/broken/dirty connector pins or damaged/broken connector or damaged/broken wires. See what you can see. Maybe something visible.
Hopefully, it is just a connector that didn't fully seat when you replace the purge valve.
Let us know what you find. Maybe, maybe not... But photos of what you look at might help if you are still stuck. Sometimes the keen eyes of our electrical experts can spot something that got missed.
Inspect wires and the connector to make sure they are not broken or damaged.
Since you replaced the purge valve, maybe there is a chance the connector was just not plugged in solid. Pull out the harness connector, spray down with electrical contact cleaner spray and try snapping it back in.
If that doesn't work, maybe damaged/broken/dirty connector pins or damaged/broken connector or damaged/broken wires. See what you can see. Maybe something visible.
Hopefully, it is just a connector that didn't fully seat when you replace the purge valve.
Let us know what you find. Maybe, maybe not... But photos of what you look at might help if you are still stuck. Sometimes the keen eyes of our electrical experts can spot something that got missed.
