codes Archives - Page 2 of 2 - UnderhoodService
Danger, Will Robinson! Intermittent Loss Of Power

This month’s Diagnostic Dilemma turns the page back to September 10, 2015 when I got a phone call from a local undercar shop inquiring if I had the tools to check the ECM connector pin fit on a 2012 Chevrolet Impala with the flex-fuel, 3.6L gasoline direct fuel injection engine. In response to an intermittent loss of power complaint, the shop had found a technical service bulletin (TSB) indicating that loose PCM connections can cause a loss of fuel pressure on the GDI engine’s high-pressure fuel rail and set codes P00C6 and P228C.

Three lobe cam for fuel pump
Acura: Intake Leak Code P2279 Set After Throttle Body Cleaning or Replacement

If you have just cleaned the throttle body and now you’ve a fluctuating idle and code P2279 (intake air system leak), the problem could be that the system needs to relearn the new throttle plate position because the system could be operating using the old data.

Oil-Related Engine Codes for VVT Engines

Variable valve timing is becoming a standard system on most late-model engines because it offers higher performance from a smaller displacement engine at higher rpms. Oil plays a larger role in VVT systems. They need engine oil not only for lubrication, but also to actuate the camshafts to change the profile of the lobes. Oil

VVT camshaft adjustment