Q: Check Engine Diagnosis - Transmission controller Communication error codes

asked by on

Check engine light came on. Transmisson would not shift from low gear. Speedometer was not registering. Stopped and restarted car. Car operated normally. Check engine light went off. Car has been operating normally. Took car to Autozone. Following was reported: P0700(indicates transmission control system). Error Codes Read P0700 (Read Fault memory of control unit ETC; U0101 (Lost communication with TCM); P1603 (PCM Internal dual port RAM communication failure; P0882 (TCM Power input signal low); P0461 (Fuel level sensor A Circuit range/performance). Car has been operating normally for about a 7 weeks but am concerned that problem may return. Advised that transmission controller may need replacement. Your opinion is appreciated.

My car has 78079 miles.
My car has an automatic transmission.

Hello there, many different faults can cause this combination of codes on your 2006 Chrysler PT Cruiser.

When we see loss of communication codes with Transmission Control Module (TCM) internal faults, this usually means one of the following:

  • the TCM is failing
  • the TCM is not being supplied with enough power
  • the wiring to the TCM is faulty

Given that you have fuel codes as well, the first place a qualified technician should check is the battery, and to inspect the wiring of the vehicle. Then a Check Engine Light inspection should be done to asses the codes.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Check Engine Diagnosis - Transmission controller Communication error codes

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Major oil leak

Hi. Large oil leaks can be difficult to pinpoint because they get all over the undercarriage. The best way to find a leak is to clean off the engine and then add dye to the system. Running the engine with...

Q: Q: Transmission slips.

If you are reusing your old fluid you are defeating the purpose of changing the filter. I would only say this is ok if the ATF (automatic transmission fluid) was already spotlessly clean. If not, I recommend having a ATF...

Q: gas gauge works but always reads as if it where full even if no gas is in the car

The fuel sender inside the tank is most likely open circuit or short circuit and needs to be replaced inside the tank on the pump.

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...