OBD Guide
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P187A

Gear Block 5th

P187A is an OBD-II diagnostic trouble code meaning: Gear Block 5th. Common causes: shift solenoid malfunction, transmission hydraulic problems. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Problems with shifting to 5th gear
  • The car goes into emergency mode
  • Increased fuel consumption
  • Unstable engine operation
  • Check Engine light comes on

Causes

  • Shift solenoid malfunction
  • Transmission hydraulic problems
  • Worn synchronizers or gears
  • Malfunction of gear position sensors
  • Problems with wiring or connectors

How to Fix

  1. Check the level and condition of the transmission fluid
  2. Diagnose the operation of switching solenoids
  3. Check the condition of the gear position sensors
  4. Inspect the wiring harness and connectors
  5. Replace damaged components if necessary

Related codes

P187BP1870P1871

FAQ

What does the P187A code mean?

P187A is an OBD-II diagnostic trouble code that indicates: Gear Block 5th

What causes a P187A error code?

The most common causes of P187A include: Shift solenoid malfunction; Transmission hydraulic problems; Worn synchronizers or gears; Malfunction of gear position sensors.

How do I fix a P187A diagnostic trouble code?

To fix P187A: Check the level and condition of the transmission fluid. Diagnose the operation of switching solenoids. Check the condition of the gear position sensors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P187A?

Yes, but get it checked soon

How much does it cost to fix P187A?

The estimated repair cost for P187A is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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