B1752
Park/Neutral Switch Circuit Short To Ground
Body Transmission Control Park/Neutral Detection 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The park/neutral switch is shorted to ground, like a light switch that's stuck in the "on" position and won't turn off. The ECU can't properly detect when your transmission is in park or neutral because the electrical signal is being pulled to ground.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Engine may not start or starts inconsistently
Transmission shift issues or limp mode activation
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the park/neutral switch voltage signal, which should toggle between high and low depending on transmission position. When shorted to ground, the signal stays at 0V continuously. The ECU detects this abnormal low-voltage condition and cannot confirm safe starting conditions.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Park/Neutral Switch Voltage High (4.5-5V) in Park/Neutral; Low (0.5V) in Drive Continuously below 0.5V with short to ground detected
Signal Integrity Clean transitions between states No state transition; stuck at ground potential
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness and connectors
Inspect the park/neutral switch connector for corrosion, moisture, or damaged pins and clean/reseat thoroughly.
2
Park/Neutral Switch
Replace the faulty switch if connector cleaning doesn't resolve the short-to-ground condition.
3
Wiring harness repair
Repair or replace damaged wiring between the switch and ECU if insulation damage causing the short is found.