P1724

Symptoms

• The car goes into emergency gearbox mode
• Check Engine light comes on
• Gear shifting problems
• The gearbox only works in one gear
• Unstable engine operation when switching

Causes

• Faulty automatic transmission control relay
• Open or short circuit in the relay circuit
• Oxidation of contacts in connectors
• Problems with the transmission control unit
• Wiring harness damage

How to Fix

1. Check the condition of the automatic transmission control relay
2. Check the integrity of the wiring and contacts in the relay circuit
3. Clean connector contacts from oxides
4. Replace faulty relay
5. Check transmission control unit

Related codes

Error P1724 by Vehicle Brand