P1621 Engine Error Code

When you check engine light came on code P1621 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 P1621 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on your car models.

P1621 Code Symptoms

P1621 OBD2 specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.

Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.

P1621 OBD-II Diagnostic Powertrain (P) Trouble Code Description P1621 Control Module Long Term Memory Performance/ Immobilizer Code Words Do Not Match so you have to check ODB-II Engine Error Code list. P1621 Code Review : The reason of P1621 OBD-II Engine Error Code is P1621 Control Module Long Term Memory Performance/ Immobilizer Code Words Do Not Match.

P1621 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 2 - Cruise Control Servo Indicates Low 1 - PCM Stack Overrun

How long can you drive with a P1621 code ?

If your vehicle is displaying a P1621 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