OBD Guide
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P18CA

Gear Position Sensor Not Learned

P18CA is an OBD-II diagnostic trouble code meaning: Gear Position Sensor Not Learned. Common causes: gear position sensor malfunction, problems with the sensor wiring harness. 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
  • Switching delays
  • Switching to emergency mode of the gearbox
  • Check Engine Light Flashing
  • Power Loss

Causes

  • Gear position sensor malfunction
  • Problems with the sensor wiring harness
  • Incorrect sensor calibration
  • Transmission control module (TCM) malfunction
  • Mechanical problems in the gearbox

How to Fix

  1. Check connections and sensor wiring harness
  2. Perform transmission position sensor learning procedure
  3. Check and replace the gear position sensor if necessary
  4. Check the operation of the transmission control module (TCM)
  5. Update TCM software if necessary

Related codes

P18CBP18CCP18CD

FAQ

What does the P18CA code mean?

P18CA is an OBD-II diagnostic trouble code that indicates: Gear Position Sensor Not Learned

What causes a P18CA error code?

The most common causes of P18CA include: Gear position sensor malfunction; Problems with the sensor wiring harness; Incorrect sensor calibration; Transmission control module (TCM) malfunction.

How do I fix a P18CA diagnostic trouble code?

To fix P18CA: Check connections and sensor wiring harness. Perform transmission position sensor learning procedure. Check and replace the gear position sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P18CA?

Limited driving only, diagnose soon

How much does it cost to fix P18CA?

The estimated repair cost for P18CA is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat