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My sister's Neon is giving a code 700 and going in and out of limp mode. Mechanic is saying it's the TCM, but I'm leaning towards something else because it doesn't stay in li p mode, and I'm not reseting the computer. It started after getting new speed sensors.

1st question, on the 2003 Neons, are the ECU and TCM one whole unit Or separate modules?

And any ideas what else it can be?
 

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Woober Goobers!
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Know the codes Wendell ! Got to get the real codes and not the P0700.
 

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Woober Goobers!
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You don't have a half-assed cheapo code reader? Even some of the cheapo code readers from HF will read them.
 

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Woober Goobers!
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Might be as simple/quick as an Input/output sensor. The codes will tell you.
 

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Woober Goobers!
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this is from the 2004 powertrain diagnostic manual:

P0501-VEHICLE SPEED SENSOR #1 PERFORMANCE

When Monitored and Set Condition:

P0501-VEHICLE SPEED SENSOR #1 PERFORMANCE
When Monitored: Engine running. Transmission not in park or neutral. Brakes not
applied. Engine run time greater than 10 seconds. Engine RPM above idle.
Set Condition: The PCM does not see vehicle speed signal from the transmission control
side of the PCM. Two Trip Fault.

Possible Causes:

GOOD TRIP EQUAL TO ZERO
TRANSMISSION DTC(S)
PCM

Looking at that and if the Neon is similar..then the PCM is bad. That's assuming there's no other transmission codes as it suggests checking for above. Don't know if it's a SBEC PCM in the Neon. You'll need to check elsewhere.
 
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