Problem with overdrive

Artur Technician Massachusetts Posted   Latest   Edited  
Updated
Drivetrain
2007 Infiniti M35 3.5L (VQ35DE) 5-spd (RE5R05A) — JNKAY01F17M456428
Vehicle Drives
Has Some Sluggishness
Will Not Shift To Overdrive On Highway. No Faults

Car shifts ok with no flares or bumps. Driving down highway it will not go into overdrive…rpms stay at 3k @70mph. No faults stored. Trans oil level ok. has new transmission oil pan installed previously…dont know why. Any input would be appreciated!

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Jared Diagnostician
Maryland
Jared
 

Is it commanding a shift of you watch on scanner? Are temperature sensors (ect and tft) reading accurately?

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Timothy Owner/Technician
Wisconsin
Timothy
 

You usually can watch the commands as JJ stated.. And, if the temperature is too low in the trans module, it will not allow the shift. If it's commanding the shift, but the shift isn't happening, it'll usually flag a code for ratio errors. Since yours does not, there is something going on with the command side I believe.

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Allan Owner
Virginia
Allan
   

Vin?

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Artur Technician
Massachusetts
Artur
 

JNKAY01F17M456428

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Michael Owner/Technician
Florida
Michael
 

ECT and TPS are also contributing sensors.

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Artur Technician
Massachusetts
Artur Update
   

Test drove vehicle found vehicle speed sensor data under transmission control module reading 30 mph while vehicle is actually at 60 MPH. The VSS data from the PCM and abs module and OBD2 are all okay, however the right front wheel speed sensor is inoperative. After much driving finally Set code c1203 in abs module…strange…could this all be caused by faulty wss? Will look further into it later…

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Jared Diagnostician
Maryland
Jared
 

Absolutely. You're on the right track.

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Artur Technician
Massachusetts
Artur
 

updating this, almost ordering a new TCm/valve body. No codes…tcm data shows mph negatively correlating with actual mph…when doing 60mph, tcm says 30mph…revolution sensor inside tcm is my suspect. Anyone else care to chime in?

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Jared Diagnostician
Maryland
Jared
   

Do you have a separate PID for VSS Meter? Also, out of curiosity, was the wheel speed sensor issue ever addressed?

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Artur Technician
Massachusetts
Artur
   

The wheel bearing was replaced, that solved the wheel speed issue but no change in transmission behavior. pcm data shows correct mph, instrument cluster data shows correct mph, abs data shows correct mph….only tcm data showing corrupt mph…service data says when revolution sensor in transmission is faulty, trans will default to shift only up to fourth gear. strange thing is, its not setting a…

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