OBD Guide
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U12AA

Lost Communication With Shifter

U12AA is an OBD-II diagnostic trouble code meaning: Lost Communication With Shifter. Common causes: open or short circuit in the wiring to the gear selector, gear selector malfunction. Estimated repair cost: $22–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–167 (est.)

Symptoms

  • Inability to change gears
  • Check Engine Light Illuminates
  • The gearbox goes into emergency mode
  • No display of the current gear on the instrument panel

Causes

  • Open or short circuit in the wiring to the gear selector
  • Gear selector malfunction
  • Connector problems or contact corrosion
  • ECU software failure

How to Fix

  1. Check the integrity of the wiring to the gear selector
  2. Inspect connectors and contacts for corrosion
  3. Test the gear selector for malfunctions
  4. Update ECU software
  5. Replace the gear selector if necessary

Related codes

U0100U0121U0140

FAQ

What does the U12AA code mean?

U12AA is an OBD-II diagnostic trouble code that indicates: Lost Communication With Shifter

What causes a U12AA error code?

The most common causes of U12AA include: Open or short circuit in the wiring to the gear selector; Gear selector malfunction; Connector problems or contact corrosion; ECU software failure.

How do I fix a U12AA diagnostic trouble code?

To fix U12AA: Check the integrity of the wiring to the gear selector. Inspect connectors and contacts for corrosion. Test the gear selector for malfunctions. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U12AA?

Do not drive — repair immediately

How much does it cost to fix U12AA?

The estimated repair cost for U12AA is $22–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat