P1627

Symptoms

• Unstable engine operation at idle
• Deterioration in acceleration dynamics
• Increased fuel consumption
• Check Engine Light Illuminates
• Possible misfires

Causes

• Malfunction of the analog-to-digital converter in the ECU
• Problems with ECU power supply
• Short circuit in the sensor circuit
• Corrosion of ECU contacts
• Mechanical damage to the ECU

How to Fix

1. Check power supply and grounding of the ECU
2. Scan all associated sensors for errors
3. Check the integrity of the wiring harnesses to the ECU
4. Test the ECU on a bench (specialized equipment required)
5. If necessary, replace the ECU

Related codes

Error P1627 by Vehicle Brand