P1644 Engine Error Code

When you check engine light came on code P1644 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 P1644 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on your car models.

P1644 Code Symptoms

P1644 the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.

Vehicle Speed Sensor (VSS) Out of Self Test Range Indicates the VSS input signal is out of Self Test range. If the PCM detects a VSS input signal any time during Self Test, a DTC P1501 will be set and the test will abort. Noisy VSS input signal from Radio Frequency Interference/ Electro-Magnetic Interference (RFI/EMI) external sources such as ignition wires, charging circuit or after market equipment. Check for VSS input to be 0 mph when vehicle transmission is in Park.

P1644 OBD-II Diagnostic Powertrain (P) Trouble Code Description P1644 Fuel Pump Speed Control Circuit Malfunction so you have to check ODB-II Engine Error Code list. P1644 Code Review : The reason of P1644 OBD-II Engine Error Code is P1644 Fuel Pump Speed Control Circuit Malfunction.

P1644 Code Dictionary Meaning:

p - Powertrain Code - Problem is related engine, transmission and emissions systems. 1 - MFG - Manufacturer Specific 6 - Vehicle Speed Control And Idle Control System 4 - Control Module Throttle Actuator Position Performance 4 - Cruise Vehicle Speed/Set Speed Difference Too High

How long can you drive with a P1644 code ?

If your vehicle is displaying a P1644 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