What Does B1752 Mean?
This code indicates that the Body Control Module (BCM) or Powertrain Control Module (PCM) has detected an abnormal short to ground condition in the park/neutral position switch circuit. The park/neutral switch (also called transmission range sensor or inhibitor switch) is responsible for informing the vehicle's control modules what gear position the transmission is in. When a short to ground is detected, the control module receives a voltage signal lower than the expected range, preventing proper identification of gear position.
Common Causes
40%
Damaged, chafed, or pinched wiring harness between the park/neutral switch and control module causing direct ground contact
30%
Faulty park/neutral position switch with internal short to ground
20%
Corroded or moisture-damaged connector at the park/neutral switch causing intermittent ground short
10%
Body Control Module or Powertrain Control Module internal fault causing false short-to-ground detection
Diagnostic Steps
1
Step 1: Perform a visual inspection of the park/neutral switch connector and wiring harness from the switch to the control module, looking for chafed insulation, pinched wires, corrosion, or moisture intrusion. Pay special attention to areas where the harness routes near sharp edges or moving parts.
2
Step 2: Disconnect the park/neutral switch connector and measure resistance between each switch signal circuit pin and chassis ground using a digital multimeter. Reading should be infinite resistance (open circuit); any measurable resistance indicates a short to ground in the wiring harness.
3
Step 3: With the switch still disconnected, measure resistance across the switch terminals according to manufacturer specifications while cycling through gear positions. Compare readings to specification; out-of-range or erratic readings indicate a faulty switch.
4
Step 4: If wiring and switch test good, inspect the control module connector for corrosion, pushed-back pins, or moisture. Check for proper ground connections at the control module. Verify control module power and ground circuits are within specification.
5
Step 5: Clear the code and perform a road test or operational test, monitoring live data for park/neutral switch voltage values. The voltage should change predictably with gear selection; constant low voltage or erratic readings confirm the fault location.
6
Step 6: After repair (wiring repair, connector cleaning, or component replacement), verify proper switch operation through all gear positions and confirm no codes return after multiple drive cycles.
Estimated Repair Cost
$125 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or Powertrain Control Module (PCM) has detected an abnormal short to ground condition in the park/neutral position switch circuit. The park/neutral switch (also called transmission range sensor or inhibitor switch) is responsible for informing t...
The most common cause of B1752 (Park/Neutral Switch Circuit Short To Ground) is: Damaged, chafed, or pinched wiring harness between the park/neutral switch and control module causing direct ground contact
Typical repair costs for B1752 range from $125 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may not start in park, may start in gear creating a safety hazard, reverse lights may not function, and cruise control may be disabled. The vehicle is generally drivable but should be repaired promptly due to potential starting issues and safety concerns with inadvertent movement.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1752 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Transmission Control System / Body Control System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
