P1624 OBDII Fault Code for 2002 Saturn SL1: Causes and Diagnosis Guide
I'm currently troubleshooting a P1624 OBDII fault code on my 2002 Saturn SL1, and I have a few questions. Does an OBDII diagnostic code like P1624 mean the same thing across all vehicle makes, or is it specific to certain brands or models? For instance, does P1620 have different implications in a Saturn versus a Ford? I recently received a P1624 code and cleared it to see if it reappears. The symptom I'm observing occurs on cold mornings: my transmission fails to lock up properly when it should—according to Saturn's specifications, the transmission is supposed to engage lock-up between 2nd and 3rd gear to improve fuel efficiency. I noticed this behavior after purchasing the vehicle and have since learned that earlier lock-up was a known issue. I'm looking for reliable guidance on how to diagnose the root cause of this problem. Is there a step-by-step repair or troubleshooting procedure available specifically for the 2002 Saturn SL1 with P1624? Any advice or resources would be greatly appreciated.
Start here: https://www.obd-codes.com/faq/obd2-codes-explained.php P1624 in Saturn vehicles indicates Customer Snap-Shot Data Availability. This code is used to capture intermittent issues, and the customer can record a snapshot by cycling the cruise control on/off three times within 3 seconds. In Ford models, P1624 relates to immobilizer communication counter reset. For your 2002 Saturn SL1, this code may point to an intermittent transmission or electronic control module issue—verify with a scan tool and check for related codes during cold starts.