If you disconnect the battery and reconnect cranks 3x then definitely SKREEM. Also only 30 retries before the ECM goes Kaput( I believe). Be wary of them trying to pad the bill , my replacement was $600. It took them over a week because original OBD3 flawed and they had to get a replacement 2nd time it took them 2 weeks because they would not believe the skreem could go out in a few months. ThaT one was done free.