P1643 Engine Error Code

When you check engine light came on code P1643 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However your vehicle's manufacturer may have a different definition for the P1643 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on your car models.

P1643 Code Symptoms

P1643 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.

P1643 OBD-II Diagnostic Powertrain (P) Trouble Code Description P1643 Fuel Pump Monitor Circuit Low Input so you have to check ODB-II Engine Error Code list. P1643 Code Review : The reason of P1643 OBD-II Engine Error Code is P1643 Fuel Pump Monitor Circuit Low Input.

P1643 Code Dictionary Meaning:

- 1 - MFG - Manufacturer Specific 6 - Vehicle Speed Control And Idle Control System 4 - Control Module Throttle Actuator Position Performance 3 - TFP Valve Position Switch-Drive Without Drive Ratio

How long can you drive with a P1643 code ?

If your vehicle is displaying a P1643 OBD2 error code but is still running and driving normally, it means that the issue might not be immediately critical or causing immediate harm to the vehicle. However, it's important to address the issue as soon as possible for several reasons:

• Potential for Worsening
• Decreased Fuel Efficiency
• Emissions Testing Compliance
• Risk of Further Damage
• Safety Concerns
• Legal Considerations