Skip the auto shop - Our mechanics make house calls

Q: Saturn Ion wont change to 4th gear, its an automatic. The P0700 code comes up saying transaxal module. What does this means?

asked by on

4th gear in automatic transmission wont catch/ change. P0700 code comes up saying transaxal module. What does this means on my 2006 Saturn Ion.

My car has 172143 miles.
My car has an automatic transmission.

A: Hello. The code means there is either an el...

Hello. The code means there is either an electrical or mechanical (hydraulic) fault in the transmission, or the transmission "controls" and in your case that fault is causing your transmission not to shift. The fault itself can range from the incredibly mundane (a mouse chewed through a wire in the electronic control segment; a harness plug connector is corroded) to a real pain the neck which would be a faulty valve or solenoid in the transmission itself (in the "valve body"), although often even that issue can be repaired without removing the transmission.

The mechanic would diagnose for an open or short in the wiring harness, a faulty transmission control module, or a transmission valve body fault including a failure of an electronically controlled shift solenoid. Although the issue you are describing is troubling, it is fairly common. For example, it is not unusual at all for shift solenoids to fail. If they do, there will be no, or possibly erratic shifting. Some car models have been more prone to this issue than others. An expert from YourMechanic could diagnose this shifting issue for you and get you on your way to a professional repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: I replaced pcm and now I'm getting code u0100 and p0700. Battery is new and not holding enough bolts. Something is draining it. Wh

To determine if the cause of those two codes is low voltage, I would simply fix the parasitic power draw first, reset the PCM (erase the codes) and see if the problem recurs. The cost to resolve such an electrical...

Q: The speedometer, odometer, & mileage gauges are not working.

This is likely related to what is called a speed input/output shaft sensor which is a sensor mounted down on the transmission that monitors the speed of the output shaft of the transmission. This is relayed to your ECU which...

Q: automatic transmission,will only go if i manually shift

You may have a bad shift governor in the back of the transmission. The governor will shift the transmission as you speed up. Some transmissions have a manual type and others use an electronic type. Either way, it is in...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...