What Does P1667 Mean?
The PCM has detected a malfunction in the starter disable circuit, which is part of the vehicle's security or immobilizer system. This circuit prevents the starter from engaging under certain conditions.
Safety Warning
May prevent vehicle from starting, leaving driver stranded. If intermittent, vehicle may stall and fail to restart in traffic.
Common Causes
30%
Faulty immobilizer control module or security system module
25%
Damaged wiring or poor connections in starter relay control circuit
20%
Defective starter relay or starter relay circuit failure
15%
PCM internal fault in starter control output driver
10%
Faulty ignition switch or neutral safety switch affecting starter circuit
Diagnostic Steps
1
Step 1: Verify vehicle starts normally and check if code is current or history-only
2
Step 2: Inspect starter relay operation by listening for relay click and testing relay coil and contacts with multimeter
3
Step 3: Check wiring between PCM and starter relay for continuity, shorts to ground, or shorts to power
4
Step 4: Use scan tool to command starter relay on/off and monitor PCM output status
5
Step 5: Test immobilizer system communication with scan tool and verify proper key recognition
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected a malfunction in the starter disable circuit, which is part of the vehicle's security or immobilizer system. This circuit prevents the starter from engaging under certain conditions.
The most common cause of P1667 (Starter Disable Circuit Malfunction) is: Faulty immobilizer control module or security system module
Typical repair costs for P1667 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May prevent vehicle from starting, leaving driver stranded. If intermittent, vehicle may stall and fail to restart in traffic.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1667 to identify the root cause.
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Quick Info
Category
Powertrain
System
Starting and Security System
Difficulty
Type
Manufacturer
Recommended Tools
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