Transmission not shifting right?

Ooooh.

It's the light with the letter P over it.
On your power/comfort switch.

You must of thought that I was crazy,
because as you said, the CHECK ENGINE light will come on anytime the key is ON and the engine is not running.

Sorry about the confusion.

PS, I wanted to tell you what you are looking for.
It wont be like what you are used to.

Say a GM code 12 would be flash, flash, flash.

These will be like morse code. Long, short, short, short, short, short.

Hi oehley,

Thank you for the donation.

What is the model of your transmision, RE4F02A or RE4F04V?

When the Power indicator lights flashwes, it indicates an error has been detected and you need to retrieve the trouble code to find out what is wrong.

SELF-DIAGNOSTIC PROCEDURE
NOTE:
Perform self-diagnosis with engine at normal operating temperature.

1. Ensure engine is at normal operating temperature. Turn ignition switch to OFF position. Set transmission mode switch to AUTO position, overdrive switch to ON position, and selector lever to "P" position. Turn ignition switch to ON position, but DO NOT start engine. POWER indicator light should come on for 2 seconds.

2. Turn ignition switch to OFF position and move selector lever to "D" position. Set overdrive switch to OFF position. Turn ignition switch to ON position, but
DO NOT start engine. Move selector lever to "2" position. Set overdrive switch to ON position, move selector lever to "1" position, and set overdrive switch to OFF position.

3. Depress accelerator pedal to floor and release pedal. Record POWER indicator light flashes.

NOTE:
The term "Judgement Flicker" refers to light flashes of the POWER indicator light.

I'll see what I can find, but often the vent hose is attached to a U shaped plastic or metal pipe.

But normally the pipe is on a bracket keeping it pointing down, so water can not get into it.

Are all the 10 flashes same or is any in between that is slightly longer than the rest?

Did you perform the trouble code retrieval immediately after turning off the engine as soon as the POWER light starts flashing?

If no trouble codes are present, it could mean a fault with the TCM or its wiring circuit that intermittently fails, especially when warmed up. This could mean a loose or contaminated wire connection somewhere.

Sorry, no pictures.

Keep me informed of the outcome.

The first long blink is the starting indicator and if the next one is prolonged, it means a revolution sensor fault code.

REVOLUTION SENSOR CIRCUIT TEST
Revolution sensor is a voltage generating sensor and should be tested using a voltmeter set on AC scale. Check voltage between ATCU terminal No. 25 and ground while driving vehicle. Voltage should rise gradually relative to vehicle speed. At zero MPH, voltage should not be present.

Hi there, check for any set codes that relate to specific transmission problem, and get a service done by a trans specialist, they will have a better idea as to any problem that the trans may have.

Mark (mhpautos)

Have you reconfirmed the trouble code?

Have you tested the wires for continuity between sensor and TCM?

From what transpired, I believe it was the wireharness that caused the problem and it could be near the VSS or underdash.

Recheck the connectors, especially those between the engine and TCM. Some could be contaminated or loose and if it is contaminated, problem might recurr when contact deteriorates again.

The TCM would provide a backup for any failed sensor and the blip was when it was changing to backup mode.

Hope problem is has been fixed permanently.

Have a nice day.