Cadillac P1688: Unmanaged Engine Torque Delivered to Transmission Control Module (TCM) Signal

Is your scanner showing Cadillac P1688?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

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OVERVIEW

Severity

High

DIY Difficulty Level

Intermediate

Repair Cost

$80-$150

Can I Still Drive?

Yes (Short-term only)

What Are The Potential Causes Of The Cadillac P1688 Code?

Inspect the wiring for poor electrical connections at the TCM. Inspect for the following conditions:

A bent terminal
A backed-out terminal
A damaged terminal
Poor terminal tension
A chafed wire
A broken wire inside the insulation
When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

You may have to drive the vehicle in order to experience a condition.

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

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