OBD Guide
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P1723

Automatic Transmission Control Relay Stuck On

P1723 is an OBD-II diagnostic trouble code meaning: Automatic Transmission Control Relay Stuck On. Common causes: faulty automatic transmission control relay, short circuit to ground in the relay control circuit. Estimated repair cost: $6–28.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$6–28 (est.)

Symptoms

  • The gearbox does not work correctly or goes into emergency mode
  • Possible problems with gear shifting
  • Battery drains when parked for long periods of time
  • Check engine light or transmission fault
  • Increased noise or vibration from the transmission

Causes

  • Faulty automatic transmission control relay
  • Short circuit to ground in the relay control circuit
  • Open or short circuit in the wiring to the relay
  • Transmission control module (TCM) malfunction
  • Corrosion or poor contact in relay connectors

How to Fix

  1. Check the condition and operation of the automatic transmission control relay
  2. Check the integrity of the wiring and contacts in the relay circuit
  3. Check for short circuits to ground in the control circuit
  4. Check the serviceability of the TCM control unit
  5. Replace the faulty relay if necessary

Related codes

P1721P1722P1724

Error P1723 by Vehicle Brand

FordLincolnMazdaMercuryVolkswagen

FAQ

What does the P1723 code mean?

P1723 is an OBD-II diagnostic trouble code that indicates: Automatic Transmission Control Relay Stuck On

What causes a P1723 error code?

The most common causes of P1723 include: Faulty automatic transmission control relay; Short circuit to ground in the relay control circuit; Open or short circuit in the wiring to the relay; Transmission control module (TCM) malfunction.

How do I fix a P1723 diagnostic trouble code?

To fix P1723: Check the condition and operation of the automatic transmission control relay. Check the integrity of the wiring and contacts in the relay circuit. Check for short circuits to ground in the control circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1723?

Do not drive — repair immediately

How much does it cost to fix P1723?

The estimated repair cost for P1723 is $6–28. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat