ODB2 question - P2405

[ricksin]

I have a xc70, 2005 with 130,000 miles. My check engine light was on and gave me P0443 error. I have clanged the gas cap and J hose, but it does not fix the problem. The check engine light is on again with different code after a week.

I got a new code "P2405 -- ECM-436D -- Leak diagnostic unit -- Signal too low". Does anyone have any idea for my next step?

Thanks

[jda2000]

you need a new leak detection pump(LDP), but before you replace it make sure the ECM had the LDP software update.

50% of the time, just the software upgrade does the trick. Ask your dealer.