P0688 ECM/PCM Power Relay Sense Circuit

[dickdale]

I've got a P0688 code on the tuner with my Mopar Crate Harness Kit 6.4 Hemi. Car ran great before.

I've checked the relays and fuses, the battery and ground cables are good.

Can anybody help me out?

 

[vance.dykes]

i'm reading it is a trans temp dtc

 

[vance.dykes]

Home ChryslerP0668

Chrysler DTC P0668​

Make:ChryslerCode0668DefinitionCM-ECM-TCM Internal Temperature Sensor 1 Circuit LowDescription:The transmission monitoring system uses three temperature sensors. If any one of the sensors fail, the other two sensors are used for the control and temperature monitoring calculations and the Malfunction Indicator Lamp (MIL) will not be illuminated. The MIL will only illuminate when more than one temperature sensor has a failure.Cause:

• NO REPAIRS REQUIRED IF ONLY ONE TEMPERATURE SENSOR HAS FAILED
• TRANSMISSION CONTROL MODULE (TCM)

 

[dickdale]

Home ChryslerP0668

Chrysler DTC P0668​

Make:ChryslerCode0668DefinitionCM-ECM-TCM Internal Temperature Sensor 1 Circuit LowDescription:The transmission monitoring system uses three temperature sensors. If any one of the sensors fail, the other two sensors are used for the control and temperature monitoring calculations and the Malfunction Indicator Lamp (MIL) will not be illuminated. The MIL will only illuminate when more than one temperature sensor has a failure.Cause:

• NO REPAIRS REQUIRED IF ONLY ONE TEMPERATURE SENSOR HAS FAILED
• TRANSMISSION CONTROL MODULE (TCM)

That's a different code. Mine is P0688

 

[vance.dykes]

That's a different code. Mine is P0688

sorry lets try this the asd relay has always been a pain.

P0688 - ECM/PCM Power Relay Sense -Open

Does anyone have any experience with a P0688 code? It appears to be that there is an issue with a ground or power being supplied to the PCM module, but I can't seem to track down where. Based on other Internet searches, I've checked the following: - all of the fuses related to ECM/PCM or Trans...

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