Hey Everybody. I'm new to the GX family (05 w 130K) and new to the forum. First, thanks to this forum as I was prowling a TON before I purchased mine recently and all the info I read really helped me pick what I hope is a solid rig. It spent its entire life in Memphis, one-owner, all service done at Lexus of Memphis except TB at 109K which was done at a local Toyota dealer. However, ever since I drove it home to Denver, CO, its been throwing CEL codes like crazy. The truck runs great, all regular maintenance done, been given a thorough once-over by my trusted local shop, new battery, just passed CO emissions with flying colors, so I'm stumped.
Here's a timeline of the Dates and Codes I'm dealing with. Is my GX struggling adapting to the altitude? Anyone else at altitude have these problems? Do I need to replace the ECM? I've read that is a very uncommon problem. Thank you in advance for any tips or pointing me to a previously solved problem. Note these are different codes each time, but a lot of them include the ECM as a potential problem.
Error Codes and Dates:
2-16-20 CEL
C1201 - Engine Control System Malfunction
Possible Causes:
-Sequential Multiport Fuel Injection (SFI) System Problems -Check for other codes
P0420 - Catalyst System Efficiency Below Threshold Bank 1
Possible Causes
-Faulty Three-way Catalyst Converter Bank 1
-Exhaust Tube
-Intake Air Leaks
-Faulty Oxygen (O2) Sensor
-Faulty Fuel injector(s)
-Leaking Fuel Injector (s)
-Faulty Spark plugs
-Improper Ignition Timing
-Faulty Engine Control Module (ECM)
-Dirty Air Filter
P0606 - Engine Control Module/Powertrain Control Module Processor.
Possible Causes
-Faulty Engine Control Module (ECM)
-Engine Control Module (ECM) Harness power supply circuit is open or shorted
-Engine Control Module (ECM) Programming
2-24-20 - Cleared Codes for visit to Emission Testing Center. (We have to pass in CO to register our cars)
2-26-20 - Passed Emissions w flying colors
2-28-20 - CEL
P2445
Possible Causes
-Air pump fuse Vacuum hose
-Air pump assembly
-Faulty Pressure Sensor
-Air pump harness is open or shorted
-Air pump circuit poor electrical connection
-Pressure Sensor harness is open or shorted
-Pressure Sensor circuit poor electrical connection
2-29-20 - Random - Put bottle of Techroline in gas tank because I don’t know how clean the injectors are and figured it couldn't hurt w 130K.
3-2-20 - Codes Cleared by themselves!
3-6-20 - CEL
P1442
Possible Causes
-Faulty Vacuum Switching Valve (VSV)
-VSV for air injection control circuit Bank 1
-Air Switching Valve Bank 1
-VSV for air injection system Bank 1
-Engine Control Module (ECM)
3/10 - Cleared codes w OBDII Scanner
4/6 CEL
P1445
Possible Causes
-Faulty Vacuum Switching Valve (VSV)
-VSV for air injection control circuit Bank 2
-Air switching valve No.2 Bank 2
-VSV for air injection system Bank 2
-Engine Control Module (ECM)
END!
Here's a timeline of the Dates and Codes I'm dealing with. Is my GX struggling adapting to the altitude? Anyone else at altitude have these problems? Do I need to replace the ECM? I've read that is a very uncommon problem. Thank you in advance for any tips or pointing me to a previously solved problem. Note these are different codes each time, but a lot of them include the ECM as a potential problem.
Error Codes and Dates:
2-16-20 CEL
C1201 - Engine Control System Malfunction
Possible Causes:
-Sequential Multiport Fuel Injection (SFI) System Problems -Check for other codes
P0420 - Catalyst System Efficiency Below Threshold Bank 1
Possible Causes
-Faulty Three-way Catalyst Converter Bank 1
-Exhaust Tube
-Intake Air Leaks
-Faulty Oxygen (O2) Sensor
-Faulty Fuel injector(s)
-Leaking Fuel Injector (s)
-Faulty Spark plugs
-Improper Ignition Timing
-Faulty Engine Control Module (ECM)
-Dirty Air Filter
P0606 - Engine Control Module/Powertrain Control Module Processor.
Possible Causes
-Faulty Engine Control Module (ECM)
-Engine Control Module (ECM) Harness power supply circuit is open or shorted
-Engine Control Module (ECM) Programming
2-24-20 - Cleared Codes for visit to Emission Testing Center. (We have to pass in CO to register our cars)
2-26-20 - Passed Emissions w flying colors
2-28-20 - CEL
P2445
Possible Causes
-Air pump fuse Vacuum hose
-Air pump assembly
-Faulty Pressure Sensor
-Air pump harness is open or shorted
-Air pump circuit poor electrical connection
-Pressure Sensor harness is open or shorted
-Pressure Sensor circuit poor electrical connection
2-29-20 - Random - Put bottle of Techroline in gas tank because I don’t know how clean the injectors are and figured it couldn't hurt w 130K.
3-2-20 - Codes Cleared by themselves!
3-6-20 - CEL
P1442
Possible Causes
-Faulty Vacuum Switching Valve (VSV)
-VSV for air injection control circuit Bank 1
-Air Switching Valve Bank 1
-VSV for air injection system Bank 1
-Engine Control Module (ECM)
3/10 - Cleared codes w OBDII Scanner
4/6 CEL
P1445
Possible Causes
-Faulty Vacuum Switching Valve (VSV)
-VSV for air injection control circuit Bank 2
-Air switching valve No.2 Bank 2
-VSV for air injection system Bank 2
-Engine Control Module (ECM)
END!