OBD-II Code P1693 — What It Means & How to Fix It

What Does This Error Mean?

P1693 is a Chrysler, Dodge, and Jeep-specific companion code. It means a fault code is stored in a different controller — typically the TCM (Transmission Control Module) or another module. P1693 itself is not the actual fault — it is the PCM's way of telling you to check other modules. Always retrieve codes from ALL modules, not just the engine. The real problem will be in the transmission or another system.

Affected Models

Common in Dodge Ram diesel trucks (Cummins 5.9L and 6.7L)
Common in Dodge Durango and Jeep Grand Cherokee
Common in Chrysler 300 and Dodge Charger with automatic transmission
Seen in Dodge Dakota and Jeep Liberty

Common Causes

Fault code stored in the TCM (Transmission Control Module) — the most common cause
Fault code stored in the ABS module triggering a cross-module notification
Communication loss between the PCM and another module on the CAN bus
Faulty wiring or connector on the inter-module communication network
Software glitch in the PCM or a companion module

How to Fix It

Use a scan tool that can read ALL modules — not just the engine PCM — to retrieve all stored codes.

Many basic code readers only scan the engine PCM. You need a bi-directional scanner or take it to a shop.
Identify the companion fault code stored in the TCM, ABS module, or other controller.

P1693 is always a companion to another real fault code. The real code is what needs to be diagnosed.
Address the root fault code in the companion module — follow the specific diagnostic steps for that code.

Once the companion code is resolved and cleared, P1693 will also clear.
Check all wiring connectors on the CAN bus harness — especially near the firewall and transmission tunnel.

If no companion code is found but P1693 persists, a loose CAN bus connector may be the cause.
Clear all codes and perform a full drive cycle. Check all modules again to confirm all faults are resolved.

P1693 should not return once the companion fault is properly fixed.

When to Call a Professional

The cost of repair depends entirely on what the companion fault code says. A transmission solenoid replacement may cost $150 to $400. ABS module repair can range from $200 to $600. Always retrieve all module codes before estimating repair cost.

Frequently Asked Questions

Is P1693 a serious code by itself?

Not on its own — P1693 is just a notification that another module has a fault. The seriousness depends on what the companion code is. A minor sensor fault in the ABS module is less urgent than a transmission failure code.

My scanner only shows P1693 and nothing else — is that normal?

This usually means your scanner only reads the engine PCM. You need a scanner that can access all modules (TCM, ABS, BCM, etc.). Auto parts stores that offer free scanning may be limited to engine codes only — a shop with a full-system scanner is needed.

Can I clear P1693 without fixing anything?

You can clear it, but it will come back as long as the companion fault exists in another module. Clearing codes without fixing the root cause only delays the inevitable. Always address the underlying fault first.