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Trying to help out my neighbor here.

2007 Charger with a 2.7L. 100k+ Miles on the body/transmission.

"If I drive very carefully I can get it up to highway speed. If I romp on it, or push it too hard to pass etc, seems to go into limp mode. Sometimes the speedo will follow the tach. Like it's hanging in gears."

How should we start troubleshooting?

Thanks.

EDIT:

Does anyone know if the "Key Dance" will display transmission codes? It appears to show Power-train codes, which I assume would cover the transmission codes, but are there Chrysler specific codes that do not present themselves in the DTC P-Codes, requiring different tools/protocols to read?

I am not sure I can read transmission codes with my BAFX and TorquePro?

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  • Welcome to Motor Vehicle Maintenance & Repair! – Pᴀᴜʟsᴛᴇʀ2 Mar 22 '18 at 12:18
  • Have they had the codes read? I'm assuming the check engine light has come on since it's going into limp mode. Getting those would be a great first step in troubleshooting. – Pᴀᴜʟsᴛᴇʀ2 Mar 22 '18 at 12:30
  • Does the key-dance display transmission codes? – NitrusInc Mar 22 '18 at 12:46
  • I'm not sure what is meant by "key-dance display", but if you're talking about the scroll on the dash while the vehicle is started/running, then no, not usually. An OBDII reader should pick up the diagnostic codes which are present. – Pᴀᴜʟsᴛᴇʀ2 Mar 22 '18 at 13:12
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    If the MIL is on with a p0500/1 or similar look for codes and communication with the EBCM. If the TCM doesn’t see wheel speed from the EBCM it can cause a no shift or tach/speedo inop condition. Also i doubt you’d be able to read anything other than a p0700/50x or a u-code for implausible data on the PCM side. – Ben Mar 22 '18 at 14:30

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