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2000 Pontiac Grand Prix P0418 and P0410 Codes: Causes of Power Loss and Bogging at 2500-3000 RPM

Model: 2000 Pontiac Grand Prix Fault Code: P0410 Posted: 2016-10-21 23:45

I own a 2000 Pontiac Grand Prix SE with a 3.8L engine, and over the past two to three weeks, I've experienced significant power loss and noticeable bogging between 2,500 and 3,000 RPM. The vehicle stalls or hesitates when under load, especially in gear, and fails to shift properly during these conditions. In park, the engine runs smoothly at idle or can be held steady between 2,500 and 3,000 RPM without hesitation—however, driving in gear triggers the issue. I've already replaced a coil pack and addressed a faulty plastic gasket. Given this behavior, I'm wondering whether a malfunction in the secondary air injection system (specifically P0418 and P0410 codes) could be contributing to these drivability problems.

Related fault codes
P0410P0418
Comments (4)
Anonymous 2016-10-22 11:40

The only fault codes present are P0418 and P0410—no EGR-related errors. For the described bogging behavior, use your OBD2 scanner to check the MAF (Mass Airflow) sensor and fuel trim values. If no scanner is available, inspect fuel pressure and clean the MAF sensor. Note: Avoid using oiled air filters (e.g., CAI systems), as they can interfere with airflow readings.

Anonymous 2016-10-22 13:14

Thanks for the input. Today I removed the secondary air pump to inspect it—there was a small amount of water inside, but when I hot-wired the pump while it was out, it still functioned properly. Is there a fuse or relay involved that could be causing this issue?

Anonymous 2016-10-22 14:19

Consider checking for Technical Service Bulletins (TSBs) related to water ingress in the air pump. I recall TSB #04-06-04-037 addressing this—searching online should locate it. Additionally, P0418 may indicate a faulty relay in the underhood fuse box. Verify that all components in the air injection system are properly connected and dry. Also review fuel trim values and MAF sensor performance for drivability issues.

Anonymous 2016-10-22 19:08

I located the control circuit relay behind the driver's side front bumper—there was water inside, and it had failed. I replaced it with a new one from Advance Auto Parts for $23.00. I’ll test the vehicle again in the morning. Hopefully, this resolves both the P0418 and P0410 issues and the bogging symptoms.