What Does P1724 Mean?
The starter interlock circuit, which prevents starting in gear, has detected a short to ground condition. This safety circuit ensures the vehicle can only start in Park or Neutral.
Common Causes
35%
Shorted wiring in starter interlock circuit to chassis ground
30%
Faulty transmission range sensor with internal short
20%
Damaged or pinched wiring at transmission external harness
15%
Failed powertrain control module with internal short circuit
Diagnostic Steps
1
Step 1: Disconnect transmission range sensor connector and check if short to ground clears
2
Step 2: Measure resistance between starter interlock circuit wire and ground with sensor disconnected
3
Step 3: Inspect wiring harness along transmission bellhousing area for damage or rubbing
4
Step 4: Test transmission range sensor internal circuits for shorts using ohmmeter
5
Step 5: If external circuits test normal, suspect PCM internal fault and test input circuit at PCM connector
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
The starter interlock circuit, which prevents starting in gear, has detected a short to ground condition. This safety circuit ensures the vehicle can only start in Park or Neutral.
The most common cause of P1724 (Starter Interlock Circ. Short to Ground) is: Shorted wiring in starter interlock circuit to chassis ground
Typical repair costs for P1724 range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Critical safety system that prevents starting while in gear. Malfunction could potentially allow starting in gear, causing unexpected vehicle movement. Vehicle may fail to start at all.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1724 to identify the root cause.
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Quick Info
Category
Powertrain
System
Starting System / Transmission Interlock
Difficulty
Type
Manufacturer
Recommended Tools
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