P05D7

Symptoms

• Check Engine Light Is On
• Unstable or random switching of driving modes
• Brief crashes when selecting a mode
• Intermittent errors on the dashboard
• Inconsistent transmission response to mode selection

Causes

• Mechanical wear of mode switch contacts B
• Contaminated or oxidized switch sliding contacts
• Unstable reference voltage in the circuit
• Poor contact in switch connector
• Damage to wiring with intermittent loss of contact

How to Fix

1. Read fault codes and record the conditions under which they appeared (at what mode/temperature)
2. Inspect and clean switch B connector contacts
3. Check the stability of the reference voltage at different switch positions using an oscilloscope
4. Measure the resistance of the switch in each position and compare with the norm
5. If the readings are unstable or worn, replace the driving mode switch B
6. Check the power stability of the mode control unit

Related codes

Error P05D7 by Vehicle Brand