2006 300c SRT8 won't go past 35 MPH - Chrysler 300C Forum: 300C & SRT8 Forums
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post #1 of 5 (permalink) Old 09-15-2012, 10:40 PM Thread Starter
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2006 300c SRT8 won't go past 35 MPH

Just bought a 2006 300c SRT8 with 60k on it with a few known problems and this not being one of them lol. The car will not go past 35 MPH, when you first take off after just starting it, it will go past 35 MPH then soon after it will cut my speed down to 35 MPH. I just did a filter kit on kit hoping it would help but it is the same.
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post #2 of 5 (permalink) Old 09-17-2012, 12:46 PM
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any check engine lights?

Michael
2006 300C SRT8
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post #3 of 5 (permalink) Old 09-17-2012, 07:43 PM Thread Starter
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There is no engine codes but it has a trans code p1731 and abs code c1073 after doing all the test on the code c1073, told me to replace the abs module which I will do tomorrow.

Last edited by wet300SRT8; 09-17-2012 at 07:44 PM.
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post #4 of 5 (permalink) Old 09-18-2012, 11:09 AM
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There is a speed sensor in the valve body in the transmission (2 actually)... Multiple codes including ABS codes can sometimes be related to this. It would seem your car is entering limp mode and keeping you where it wants you. I would start with fluid level in the transmission and clearing codes... if you have 2 ABS sensor CEL's then its going to limp out anyway... if the level is ok then I would think more valvebody and speed sensors (NOT wheel speed sensors... the ones on the VB).... I will do some searching on your codes... but my 2 cents is check fluid and erase stored ABS codes... if it still pops then speed sensors on the VB or possibly the whole VB assembly and last resort TCM... I will search a little!

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post #5 of 5 (permalink) Old 09-18-2012, 11:14 AM
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I'll look again later but a quick search pulled this info on the code...

P1731-INCORRECT GEAR ENGAGED

For a complete wiring diagram Refer to Section 8W
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 different gear than the TCM intends.
NOTE: The transmission control module is programmed to immediately place the transmission into neutral if P0730 or P1731 codes are set. These codes indicate that the transmission experienced an unknown or incorrect gear ratio. Placing the transmission in neutral prevents potential catastrophic failure. When this occurs, the transmission will remain in neutral until the vehicle slows to 29 Km/h (18 mph).


When Monitored: Engine rpm greater than 450 rpm, no N2 - N3 input speed sensor errors present, no gear selector lever errors present, no ABS system errors, and vehicle speed above 10 Km/h (6 mph).
Set Condition: No shifting operation and actual gear differs from the target gear. No shifting operation - actual (calculated) gear differs from target (expected) gear, actual (calculated) turbine speed is greater than 300 rpm or calculated transmission ratio is above threshold. During an Upshift - actual (calculated) gear is less than target (expected) gear. During Downshift - actual (calculated) gear is greater than target (expected) gear. Exception: Actual (calculated) gear is 1st and target (desired) gear is 2nd.
Possible Causes
LOW FLUID LEVEL
ABS DTCS PRESENT
TRANSMISSION SOLENOID, SPEED SENSOR AND/OR OTHER ELECTRICAL RELATED DTCS PRESENT
INTERMITTENT STICKING VALVE IN THE VALVE BODY
INTERNAL TRANSMISSION PROBLEM
TRANSMISSION CONTROL MODULE
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