P1667 — Starter Disable Circuit Malfunction

For Ford vehicles

cylinder ID circuit

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P1667 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the starter disable for damage, corrosion, chafing or poor contact.
Subsystem check Run the module's actuator test for the starter disable if your scanner supports it — a component that does not respond to a direct command is confirmed faulty.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P1667 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P1667 (parts and labor, USD, independent shop rates): Replace the faulty sensor or actuator: $150–$500; Repair wiring or connectors: $80–$250; Control module repair: $300–$1,000. Overall, fixing P1667 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Will P1667 clear itself?

Sometimes P1667 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What are the symptoms of P1667?

Drivers most often notice: Check Engine Light on, possible limp mode depending on the affected component, increased fuel consumption in some cases, the affected system operates intermittently or not at all.

How much does it cost to fix P1667?

Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250; Control module repair — $300–$1,000. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does OBD2 code P1667 mean?

Starter Disable Circuit Malfunction (P1667): a powertrain (engine/transmission) fault affecting the sensor and actuator circuits. The car is usually drivable while you plan the repair. Most often caused by poor ground connection, faulty sensor or actuator of the affected circuit, open or shorted wiring in the circuit.

Is it safe to drive with P1667?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

When your engine control unit detects a problem with the starter disable circuit, it logs trouble code P1667. This code falls under the powertrain category, meaning it relates to engine and transmission management systems. The official definition describes a malfunction within the circuit responsible for enabling or disabling the starter — essentially, the system that tells your car it's safe to crank the engine.

The starter disable circuit plays a protective role in your vehicle's starting sequence. When everything works correctly, the control module verifies that conditions are appropriate before allowing the starter to engage — things like gear position, brake pedal status, and ignition state. The module constantly monitors this circuit through self-diagnostics. If the electrical behavior doesn't match what the software expects during its continuous checks, P1667 gets stored. This isn't necessarily a problem with a single wire or sensor; the fault could be in the component itself, the wiring, or even the module's internal programming.

When the ECU identifies that sensor and actuator readings fall outside acceptable parameters for too many drive cycles, it sets P1667 and illuminates the check engine light. The stored freeze frame data captures exactly what was happening at that moment — engine RPM, load percentage, coolant temperature, and vehicle speed. This snapshot gives you a precise starting point for troubleshooting rather than guessing blind.

Symptoms of P1667

Check Engine Light remains illuminated after startup
Vehicle may enter limp mode with reduced power output depending on which component is affected
Some drivers notice higher fuel consumption during the fault period
The starter disable system operates inconsistently or fails to function
Intermittent starting issues where the engine occasionally refuses to crank
Additional warning lights may accompany the check engine indicator in severe cases

Common Causes

The most frequent culprits behind P1667 are wiring problems and connector failures in the starter disable circuit. Chafed insulation, corrosion buildup at electrical contacts, or connectors that have worked loose over time create the exact kind of unpredictable behavior that triggers this code.

Internal component failure ranks high on the list — the starter disable relay, sensor, or related actuator can fail outright and cause the self-test to report incorrect values. Control module issues represent another common cause, whether it's a failed output driver within the ECU itself or software that needs updating through a reflash. Poor ground connections throughout the circuit can also produce symptoms identical to open or shorted wiring, making thorough testing essential before assuming the worst.

How to Diagnose P1667

Start by connecting an OBD2 scanner and confirming that P1667 is the active or pending code. Record the freeze frame data immediately — this information tells you exactly what conditions existed when the fault occurred, guiding your entire investigation.

Next, pull all stored codes from every module on the vehicle. Related diagnostic trouble codes often point toward the root cause rather than the symptom. Check for any manufacturer technical service bulletins (TSB) specific to your make, model, and model year — many P1667 issues have known factory fixes or require software updates that your dealer can apply.

Perform a detailed visual inspection of the wiring harness and connectors tied to the starter disable circuit. Look for damaged insulation, green or white corrosion deposits, bent pins, and any signs of moisture intrusion. If your scan tool supports bidirectional controls, run the actuator test for the starter disable — a component that won't respond to direct commands is definitively faulty.

Use a multimeter to verify proper reference voltage, ground integrity, and signal continuity at the component connectors. Finally, perform a wiggle test on the harness while monitoring live data; any signal dropouts indicate broken wires hidden inside the insulation.

Repair Options

Depending on what's actually wrong, repair costs vary significantly. If testing reveals a faulty sensor or actuator in the starter disable circuit, expect to pay between $150 and $500 for the part plus labor. Wiring repairs or connector replacements typically run $80 to $250. In cases where the control module itself has failed, repair or replacement ranges from $300 to $1,000.

Total Repair Cost

For most vehicles experiencing P1667, the total bill typically falls between $80 and $1,000 depending on the root cause. The most affordable fix — correcting a loose connector or repairing damaged wiring — might cost under $100. Component replacement sits in the middle range. Control module repair or replacement represents the most expensive scenario but is rarely the first thing to check. An accurate diagnosis before purchasing parts is the best way to keep total costs reasonable.

Can You Drive with P1667?

In most situations, your vehicle remains driveable if P1667 is the only code present. You might experience slightly reduced performance or find that certain auxiliary systems operate abnormally. However, if the malfunction causes stalling, prevents the engine from starting, or triggers brake and steering warnings, treat it as urgent and have it diagnosed immediately.