They are from a 97 LS. I looked up the codes, but could use some better explanation on what to do about them. Thanks

P0300 engine misfire detected
P0446 evap vent solenoid valve control system
P1380 misfire detected rough road data not available
P1654 cruise control inhibit output control
C1234 LR Wheel speed circut open or shorted


Anti lock light went on, off now has been on for a bit

Service engine light soon came back on again today. Was on last week and shut off when they ran for the codes.

 

Here's a LINK:OBDII Code P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders | Engine-Codes.com

 

Thanks

 

Not all of them have an explanation as detailed as the 0300. Any other place to get more detail?

 

PO300
PO403
PO405
PO446 ✴︎ ⬅︎ ⬅︎ ⬅︎

All these Codes were triggered by a faulty FUEL TANK PRESSURE SENSOR!

Wait for the Low Fuel Warning before attempting to DIY.
Start engine.
Pull FUEL PUMP Relay ... Let Engine stall to relieve pressure in system.
Remove GROUND Wire from Battery.
With car Raised and SAFETY STANDS securely in place.

Support Tank with Jack.

(I made a "Jig" to attach to the Jack. Sawed the square bottom off from Milk Crate. Drilled holes through Hockey Puck. Mounted Puck to center of Milk Crate with Heavy Duty Zip Ties. Affixed carpet to other side of Milk Crate bottom for padding.)

Lower tank enough to access Sensor atop Fuel Pump.
Unfasten Pigtail from Sensor.
Unclip and Remove Sensor ••• Straight-up.
DO NOT BREAK THE END OF SENSOR OFF INSIDE PUMP!!!

If you need a Charcoal Canister do it when you replace Sensor.

Removing Relay to releive Pressure throws a Code which may require a MIL Light reset.