DTC P1616: RAM Performance Check the ''On Board Diagnostic (OBD) System Check''. Was the ''OBD System Check'' performed? YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM. NO – Go to OBD System Check.

DTC P1617: ECM Internal Ground Connection Error Check the ''On Board Diagnostic (OBD) System Check''. Was the ''OBD System Check'' performed? YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM. NO – Go to OBD System Check. aaa