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Trouble code P0446 means:Evaporative emission control system vent control circuit malfunction
P1443 Evaporative Emission Control System - Vacuum System - Purge Control Solenoid or Purge Control Valve fault Loose or defective gas cap will cause this code.
Trouble code P0440 means:Evaporative emission control system malfunction
In many cases the fuel cap is at fault, or a cracked vapor/vacuum hose.
If it is the valve on top of the fuel tank, it weel need to be replaced.
P0442 Evaporative Emission Control System Leak Detected (small leak)
P0443 - Evaporative Emission ( EVAP ) system fault - Chilton repair manual P0443 - EVAP Vapor Management Valve ( VMV ) circuit fault - Haynes repair manual P0443 - EVAP Control System Cannister Purge Valve Circuit Malfunction - DTC codes
The fault code P0404 means " Exhaust Gas Recirculation Control Circuit Range/Performance". __________________ Allobd2.com
Many, many things. Have the ECU scanned with an OBD2 scan tool which will retrieve the fault code or codes. With these codes a qualified technician can find the problem.
For Cadillac Eldorado, Seville, Buick Riviera and Oldsmonile Toronado models From Haynes General Motors book for Cadillac Eldorado & Seville 1986-1991 Buick Riviera 1986 - 1993 Olds Toronado 1986 - 1992 CODES B then number 110 -outside temp sensor or circuit fault 111 -AC temp sensor or circuit fault 'high side' 112 -AC temp sensor or circuit fault 'low side' 113 -in car temp sensor or circuit fault 115 -sunload temp sensor or circuit fault 118 -door jamb or door ajar switch or circuit fault 119 -twilight photocell or circuit fault 120 -twilight dleay pot or circuit fault 121 -twilight enable switch or circuit fault 122 -instrument panel dimmer switch or circuit fault 123 -courtesy light switch or circuit fault 124 -vehicle speed sensor 'VSS' or circuit fault 127 -park neutral position 'PNP' switch fault 128 -door jamb or door ajar switch or circuit fault 131 -engine oil pressure switch or circuit fault 132 -engine oil pressure sensor or circuit fault 140 -cellular phone system fault 331 -tape deck to CRT fault 'loss of communication' 332 -compass module to body control module 'BCM' fault 'loss of communication' 333 -SIR 'airbag' to body contol module 'BCM' system fault 'loss of communication' 334 -electronic control module 'ECM' to body control module 'BCM' fault 'loss of communication' 335 -climate control panel or CRT to BCM fault 'loss of communication' 336 -instrument panel cluster 'IPC' to BCM fault 'loss of communication' 337 -heating and ventilation and AC 'hvac' programmer to BCM fault 'communication loss' 339 -radio to CRT fault 'communication loss' 409 -charging system or circuit fault 'alternator' 410 -charging system or circuit fault 'regulator' 411 -battery voltage fault 'low' 412 -battery voltage fault 'high' 418 -climate control panel or CRT to BCM fault 'loss of crank signal' 420 -headlight or courtesy lamp relay or circuit fault 440 -heating or ventilation and AC 'hvac' system fault 'air mix door' 441 -cooling fans or circuit fault 445 -AC clutch or circuit fault 446 -AC system fault 'low refrigerant' 447 -AC system fault 'very low refrigerant' 448 -AC system fault 'low refrigerant pressure' 449 -AC system fault 'high side temp too high' 450 -AC system fault 'engine coolant temp too high' 482 -anti lock brake 'ABS' system pressure fault 552 -BCM memory reset 553 -CRT memory reset 556 -EE prom fault 660 -cruise control system fault 'cruise engaged with vehicle in park or neutral or reverse' 663 -cruise control system fault 'vehicle speed increased or decreased more than 20 mph over the set speed' 664 -cruise control system fault 'vehicle speed increased more than 4 mph in a .25 second' 665 -cruise control system fault 'engine coolant temp too high' 666 -cruise control system fault 'engine exceeds 5000 prm while cruise is engaged' 667 -cruise control system fault 'set and coast or resume and accel switch shorted' 671 -cruise control system fault 'servo position sensor or circuit' 672 -cruise control system fault 'vent control solenoid or circuit' 673 -cruise control system fault 'vacuum control solenoid or circuit' 710 -CRT switches or circuit fault
P0441 EVAP Emission Control System Purge Flow Fault You can try cleaning the gas cap of any debris and reinstalling till you hear it click. Or it could be a bad purge solenoid. Or cracked or split lines in between in the evap system.
it checks on an error and it will solve the fault by it's self