2007 Dodge Charger v6 3.5L NAG1 RWD trans HELP!! LIMP MODE CAUSE - Dodge Charger Forums
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post #1 of 2 Old 03-19-2017, 09:06 AM Thread Starter
Jon Kelley
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2007 Dodge Charger v6 3.5L NAG1 RWD trans HELP!! LIMP MODE CAUSE

I have a 2007 dodge charger v6 3.5L engine NAG1 RWD Transmission...I'm confused in what is causing limp mode in my car..when the codes are cleared initially I can drive a day or two then the first and only code I'm getting is p0420 bank 1 cat efficiency below threshold..It doesnt go in limp mode still and I can drive another day or two..Eventually it goes in limp mode and then I receive the codes p2767 and p2784..input speed sensor codes..The transmission shop recommends changing the conductor plate, which houses the speed sensors..I've already replaced the catalytic converter on my driver side and bank 1 o2 sensors but I'm still getting the po420 code for bank 1..I'm trying to find out if the po420 code could be causing limp mode or if it's just the p2767/p2784 codes..The trans shop is saying the p0420 code has nothing to do with the limp mode, the limp mode problem can only be diagnosed after it goes in limp mode and that's y I'm only getting the sensor codes after and not before...I don't want to pay for a new conductor plate and then the car still goes in limp mode because of the p0420 code..it just seems like whatever is causing limp mode should show up on the diagnostic before it goes in limp mode, that's y I'm thinking it could be the p0420 code, but I could be wrong..HELP!!!
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post #2 of 2 Old 03-19-2017, 10:56 PM
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P0420 - CATALYST 1/1 EFFICIENCY
The "1/1" refers to Bank 1 Sensor 1. Bank 1 is where the Number 1 cylinder is located. Sensor 1 is the O2 sensor that is located before or upstream of the catalytic converter. For the Dodge Charger 3.5L engine Bank 1 (cyl 1) is on the passenger side.





So when you say you "already replaced the catalytic converter on my driver side and bank 1 o2 sensors" you still have the Bank 1 catalytic converter that could be causing the P0420 code.


The transmission limp mode problem is a separate issue from the catalytic converter.


P2767 - INPUT SPEED SENSOR 2 CIRCUIT NO SIGNAL
Set Condition:
If the Input Speed Sensor 2 signal is equal to 0 RPM.


P2784 - INPUT SPEED SENSOR 1/2 CORRELATION
Set Condition:
If the speed difference between the Input Speed Sensors 1 and 2 is greater than 150 RPM.


P2784 is probably getting set because of P2767. The speed difference between Input Speed Sensors 1 and 2 is going to be greater than 150 RPM if Input Speed Sensor 2 signal is equal to 0 RPM.


It's not unusual for the car to go into limp mode and then post the DTC (diagnostic trouble code). First priority for the car's computer software is to protect the engine/transmission (go into limp mode) and then post the reason for the limp mode operation (post the DTC).
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