The code P0700 is described Transmission Control System Malfunction. Basically what that means is that a malfunction has been detected in the transmission and associated components.
The presence of this code means the TCM detected a problem
TCM related Sensor has solenoid is damaged or has failed
This code is for information only - check for other TCM codes
TCM or PCM has failed
What you need to do is to clear the code. If DTC returns, replace the TCM and retest system. Ensure DTC does not return.
Check exhaust leaks at the manifold, pipes, catalytic converter, repair as required
Use a scope to diagnose the oxygen sensor operation( the oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be steadier)
Inspect the downstream heated oxygen sensor, replace if necessary.
Replace the catalytic converter
Air leaks in at the exhaust manifold or exhaust pipes
Base engine problems (high coolant or engine oil consumption)
Catalytic converter damaged or has failed
Front O2 older (aged) than the rear O2 (O2 is lazy)
A/C pressure Sensor circuit is open or shorted to VREF (5v)
A/C pressure Sensor ground circuit is open
A/C pressure Sensor is damaged or has failed
PCM has failed
Wednesday, December 23rd, 2009 AT 10:03 AM