Stumped - Codes P0706 / U0402

**watersupply189** · 08-09-2023

Have you tried contacting Randy’s to see what they have to say?

2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

**Hdawg** · 08-09-2023

Yes, they said it’s grounding out somewhere, but everything checked well when the shop checked the ohms.

They also gave me afewf spots on the harness to check for rubs or breaks, and itstill looks brand newl.

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**Hdawg** · 10-07-2023

I still can’t figure it out.

Could the PCM be faulty?

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**AK Bob** · 10-07-2023

Originally Posted by Hdawg

I still can’t figure it out.

Could the PCM be faulty?

If you have eliminated all the other possible causes listed for this code, it could be the PCM.

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**Jwaller** · 10-08-2023

Have you verified your battery connections are clean and tight?

Also, getting straightforward access to your PCM and removing the TCM connection (it should be the rear) might not hurt; inspect and clean it.

Verify the PCM is secured to the block.

Is it rattling?

Then, remove, inspect, clean, and use dielectric grease before reinstallation to rule it out on the harness-vb solenoid connection.

Maybe someone else here could correct me, but would a bad low/reverse sprag cause his problems?

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**Hdawg** · 10-08-2023

Originally Posted by Jwaller

Have you verified your battery connections are clean and tight?

Also, getting straightforward access to your PCM and removing the TCM connection (it should be the rear) might not hurt; inspect and clean it.

Verify the PCM is secured to the block.

Is it rattling?

Then, remove, inspect, clean, and use dielectric grease before reinstallation to rule it out on the harness-vb solenoid connection.

Maybe someone else here could correct me, but would a bad low/reverse sprag cause his problems?

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The PCM is part of the ECM/TCM mounted to the engine's driver's side of the engine, right?

I have a 2017.

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**AK Bob** · 10-08-2023

Originally Posted by Hdawg

The PCM is part of the ECM/TCM mounted to the engine's driver's side of the engine, right?

I have a 2017.

Yes, the PCM is the ECM/TCM mounted on the driver side of the engine block for your 2017 with the 68RFE.

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**Jwaller** · 10-08-2023

Originally Posted by Hdawg

The PCM is part of the ECM/TCM mounted to the engine's driver's side of the engine, right?

I have a 2017.

Yep.

There's a couple of ways to get to it.

You can go down from above and remove the intake horn or driver's wheel and liner.

I went through the wheel well to get to it.

It’s a tight space.

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