CODE C1201 ENGINE CONTROL SYSTEM MALFUNCTION - 2005 Toyota Highlander

Who is "they" - who hooked up the diagnostic thingy. If "they" is an auto parts house, all they can give you is the codes. You have to have the codes interpreted and see if they are related. Don't just start throwing parts into the vehicle. The transmission shop was probably right - it's an electrical issue. You need to take your vehicle to a dealership or a qualified, experienced independent shop and invest in some diagnostics.

I suggest you get the car to a good mechanic who knows Lexus cars.

• C1201 = Engine Control System Malfunction (VCS lamp ON-RX3) or ECM/TCM malfunction / 51
• C1441 = ?(Code not listed so please recheck it).
• P0300 = Random/multiple cylinder(s) - misfire detected.
• P0302 = Cylinder 2 - misfire detected.
• P0303 = Cylinder 3 - misfire detected.

The first one is a possible problem with the engine management system, (the car's brain). This could be a cheap or an expensive fix.
The last three are the cylinders not firing properly. It could be a problem with fuel or spark into those cylinders.

c1223 Malfunction in ABS control system
c1201 Brake Boost Sensor Circuit Range/Performance
c1224 Open or short circuit in NE signal circuit
u0123 Lost Communication With Yaw Rate Sensor Module
u0124 Lost Communication With Lateral Acceleration Sensor Module
u0126 Lost Communication With Steering Angle Sensor Module
p0430 Catalyst System Efficiency Below Threshold Bank 2
p0420 Catalyst System Efficiency Below Threshold Bank 1

you have major problems is it worth fixing???,its gonna be quite a bit

Error Code: C1201.
Description: Engine Control System Malfunction.
Trouble area:
- Inspect engine control system.
- Wiring.
- ECM.
Error Code C1422.
Description: Master Cylinder Pressure Sensor Zero Point High Malfunction.
Trouble area:
- Stop light switch Stop light switch circuit
- Master cylinder pressure sensor circuit
- Brake actuator assembly (Master cylinder pressure
sensor).

Error Code: C1201
Description: Engine control system malfunction.
Possible causes:
- Harness wiring.
- ECM

C1201 error code means that you have some problem in engine control system.

Possible causes for P0421 error

• Warm Up Three Way Catalytic converter deterioration or malfunction
• Exhaust system leaks
• Loose front or rear HO2Ss
• Faulty front heater O2 sensor
• O2 sensors harness is open or shorted
• O2 sensors poor electrical connection

The P0421 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem.

Hi my car toyota camry xle v6 2006 ..The is problem bya abs vcs and fuel level metar ..code. .c1201

code C-1201 engine control module C CODES IS PROBLEM IN THE ABS BRAKE SYSTEM AND THE ECM.

Hi there:This is a CHASSIS fault code... DTC C1201/51 - Engine Control System Malfunction.
Check diagnostic ponout in THIS LINK.
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This code is for your electronic throttle control system it probably needs to be cleaned the butter fly sticks due to build up in side the throttle body clean with tooth brush and emission save throttle body cleaner clear codes and then dissconnect the battery for 3 hours hook back up then go for a short drive stop and go to reset idle control that should take care of this.