OBD Guide
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P18C6

Gear Position Sensor Circuit 2 Low Voltage

P18C6 is an OBD-II diagnostic trouble code meaning: Gear Position Sensor Circuit 2 Low Voltage. Common causes: open or short circuit in the sensor circuit, gear position sensor 2 malfunction. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect gear shifting
  • The gearbox goes into emergency mode
  • Check Engine light comes on
  • Reduced engine power
  • Acceleration problems

Causes

  • Open or short circuit in the sensor circuit
  • Gear Position Sensor 2 Malfunction
  • Poor connection or corroded contacts
  • Transmission control module (TCM) malfunction
  • Problems with power or grounding of the circuit

How to Fix

  1. Check the integrity of wiring and connections
  2. Check the voltage and resistance of the sensor
  3. Replace gear position sensor 2 if necessary
  4. Check and clean contacts
  5. Scan the control unit for additional errors

Related codes

P18C5P18C7P0700

FAQ

What does the P18C6 code mean?

P18C6 is an OBD-II diagnostic trouble code that indicates: Gear Position Sensor Circuit 2 Low Voltage

What causes a P18C6 error code?

The most common causes of P18C6 include: Open or short circuit in the sensor circuit; Gear Position Sensor 2 Malfunction; Poor connection or corroded contacts; Transmission control module (TCM) malfunction.

How do I fix a P18C6 diagnostic trouble code?

To fix P18C6: Check the integrity of wiring and connections. Check the voltage and resistance of the sensor. Replace gear position sensor 2 if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P18C6?

Limited driving only, diagnose soon

How much does it cost to fix P18C6?

The estimated repair cost for P18C6 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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