OBD Guide
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P1921

Transmission Range Signal

P1921 is an OBD-II diagnostic trouble code meaning: Transmission Range Signal. Common causes: gear selector position sensor malfunction, open or short circuit in signal circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Incorrect gear shifting
  • Check Engine light comes on
  • Problems starting the engine in certain modes
  • The gearbox goes into emergency mode

Causes

  • Gear selector position sensor malfunction
  • Open or short circuit in signal circuit
  • Wiring Harness Problems
  • Transmission control module (TCM) malfunction

How to Fix

  1. Check the gear selector position sensor
  2. Check signal circuit integrity
  3. Inspect the wiring harness for damage
  4. Check the operation of the transmission control module (TCM)

Related codes

P0705P0706P0707

FAQ

What does the P1921 code mean?

P1921 is an OBD-II diagnostic trouble code that indicates: Transmission Range Signal

What causes a P1921 error code?

The most common causes of P1921 include: Gear selector position sensor malfunction; Open or short circuit in signal circuit; Wiring Harness Problems; Transmission control module (TCM) malfunction.

How do I fix a P1921 diagnostic trouble code?

To fix P1921: Check the gear selector position sensor. Check signal circuit integrity. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1921?

Yes, but get it checked soon

How much does it cost to fix P1921?

The estimated repair cost for P1921 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat