R/T Engine Code Already - P0730, Gear Ratio Incorrect - Dodge Challenger Forum: Challenger & SRT8 Forums
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Old 11-03-2008, 10:14 AM
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R/T Engine Code Already - P0730, Gear Ratio Incorrect

So I was driving under normal conditions accelerating normally and the engine coughs...strange. Then it does it again, a very sudden cough like it is struggling for air, the vehicle almost shudders too. Engine code pops up. Head to auto zone and have it checked - P0730 gear ratio incorrect. To dealership tomorrow. Car is stock.

Does anybody know what this might mean, and has anybody experienced this before. Perhaps in a Charger or Magnum?

Thanks.
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Last edited by vtodd; 01-31-2009 at 08:10 PM.
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Old 11-03-2008, 10:33 AM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

Found this on the 300C Forum, don't know if it will help you! Also did a google search and it comes up with different reasons. Good Luck! It read:

I love reading the Service Manual. Just wish I knew how to make use of it!
Here is what it says about P0730

P0730-INCORRECT GEAR RATIO
Theory of Operation
The Transmission Control Module (TCM) constantly calculates the transmission ratio based on the input speed sensor 1 and 2 (N2-N3) signals and the calculated output shaft speed. The intent of this diagnostic is to detect if the transmission is trying to mechanically shift into a lower gear then the TCM intends.

When Monitored:
Engine RPM greater than 450 RPM, output speed greater than 180 RPM, no N2 - N3 input speed sensor errors present, no gear selector lever errors present, no ABS system errors, and all wheel speeds above 450 RPM.

Set Condition:
No shifting operation and detected gear is not the actual gear. No shifting operation - detected (calculated) gear is less than actual (expected) gear, no plausible gear is calculated, actual turbine speed - calculated turbine
speed is greater than 300 RPM or calculated transmission ratio is above threshold. During an Upshift - detected (calculated) gear is less than actual (expected) gear. During Downshift - detected (calculated) gear is less than actual (expected) gear.

Possible Causes
INTERNAL TRANSMISSION PROBLEM
TRANSMISSION CONTROL MODULE

Diagnostic Test
1. CHECK FOR INTERNAL TRANSMISSION PROBLEM
Determine if there are any Transmission mechanical problems present.
Remove the Transmission Oil Pan and inspect for excessive debris or a plugged Transmission Oil Filter. Refer to
21- AUTOMATIC TRANSMISSION-AUTOMATIC TRANSMISSION NAG1/SERVICE INFORMATION for the appropriate service procedure

Is there any Transmission mechanical problems present?
Yes >> Repair as necessary. Refer to 21- AUTOMATIC TRANSMISSION-AUTOMATIC TRANSMISSION NAG1/ SERVICE INFORMATION for the appropriate service procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No >> Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM per the Service Information. Refer to 8 - ELECTRICAL/ ELECTRONIC CONTROL MODULES/TRANSMISSION CONTROL MODULE for the appropriate
service procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
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Old 11-03-2008, 01:09 PM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

Im gonna say probably a speed sensor or bad connection for a speed sensor.
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Old 11-03-2008, 04:28 PM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

I had that code a few times on Chargers and 300c's! It was usually a problem with the transmission torque convertor!
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Old 11-03-2008, 04:37 PM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

speed sensor or bad connection for a speed sensor.
I agree or a bad ground or loose connector for the switch. Should be an easy fix at the dealer!
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Old 11-03-2008, 05:41 PM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

do you think the the faulty sensor will result in the engine sputtering/coughing when lightly accelerating?
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Old 11-03-2008, 06:29 PM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

Originally Posted by vtodd View Post
do you think the the faulty sensor will result in the engine sputtering/coughing when lightly accelerating?
The trans module is programmed to put the trans in neutral as soon as code P0730 is set at speeds above 18 mph.It gets your attention when your cruising down the highway and the trans goes into neutral!!!!!! Mercedes trans programming!! I guess if your are just over 18mph it will chug and go in and out of gear!!!

Last edited by Chryslertech; 11-03-2008 at 06:32 PM.
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Old 11-03-2008, 06:36 PM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

Anytime the light goes o nthe ECM goes into limp mode if it is a hard code, so yes it can thill it is cleared. It is to protect the power train and to make sure it can limp back in for repairs and not get you stranded.

at least that is the theory i nthe design.
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Old 01-31-2009, 05:52 PM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

well, had this code again! 2nd time now. the first time the dealership said it had to do something with the transmission software being out of date? they said they updated it, but clearly that didnt solve anything. back to the dealership next week hopefully.

has anybody else had this problem?
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Old 02-01-2009, 03:14 AM
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Re: R/T Engine Code Already - P0730, Gear Ratio Incorrect

Please let us know how this works out !

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