OBD-II Code P0617 — What It Means & How to Fix It

What Does This Error Mean?

P0617 means the starter relay control circuit is reading a voltage that is too high. The ECM expects to see a specific voltage on the starter relay control wire. When it reads higher than expected — especially when it should be reading low — P0617 is set. This often indicates the control wire is contacting a power source it should not be, or the circuit has an open somewhere. The car may not crank, or the starter may engage unexpectedly.

Affected Models

All vehicles 1996+
Common in Ford and Lincoln vehicles
Common in GM cars and trucks
Common in Chrysler, Dodge, and Jeep vehicles
Common in vehicles with electronically controlled starting circuits

Common Causes

Short to voltage on the starter relay control wire — wire touching a 12V source
Open circuit in the relay control ground path causing voltage to float high
Faulty starter relay with internal damage causing voltage bleed-through
Damaged wiring harness near the fuse box with melted or crossed wires
Faulty ECM output not pulling the control wire low when expected

How to Fix It

Remove the starter relay from the fuse box. With the key off and the relay removed, check for voltage on the relay control pin socket. No voltage is normal. Voltage present means the wire has a short to power.

Trace the control wire back toward the ECM looking for any contact with 12V wiring.
Inspect the fuse box area for signs of heat damage, melted plastic, or wires that have melted together. High current faults can cause nearby wires to fuse together.

A wire that has melted against a power wire will cause a permanent short to voltage.
Test the relay itself for internal shorts. With the relay out of the circuit, measure resistance between the coil terminals and the switch terminals. They should show no continuity when the relay is unenergized.

Internal relay failure that allows voltage to bleed from the switch terminals to the coil terminals can cause P0617.
Inspect the wiring harness from the relay socket back to the ECM. Look for any areas where the insulation has worn through and the wire is contacting another powered circuit.

Pay attention to areas near the fuse box, firewall, and engine harness routing clips.
After repairing the fault, clear the code and confirm the car starts normally without engaging the starter unintentionally.

A short to voltage in the starter relay circuit can cause the starter to engage briefly when the key is just turned to the on position — a dangerous condition. Verify this is resolved.

When to Call a Professional

Wiring shorts and relay replacement are DIY-friendly repairs. Starter relays cost $10 to $25. Wiring repair at a shop typically costs $75 to $200. If the ECM output has failed, ECM replacement costs $200 to $600 or more. Always rule out wiring issues before replacing the ECM.

Frequently Asked Questions

Can P0617 cause the starter to run when I do not want it to?

Yes — this is possible and dangerous. A short to voltage on the starter relay control circuit can energize the relay when it should be off. This could cause the starter to engage while the engine is already running, which can damage the starter and flywheel. Address this code promptly.

Is P0617 hard to diagnose?

It can be tricky because the short to voltage may be intermittent. The fault may not always be present when you are looking for it. If the code comes and goes, use a wiring diagram to trace the circuit step by step.

Can the battery cause P0617?

A battery overcharging could theoretically raise system voltage above normal. But P0617 is more specifically about the starter relay control circuit reading high voltage. Check the control wire first before blaming the battery or charging system.