OBD2 Error Codes

Learn all about the P0644 code, what causes Driver Display Serial Communication Circuit issues, and how to diagnose and fix common problems to maintain optimal vehicle performance.

Learn all about the P0645 code, what causes issues in the A/C clutch relay control circuit, and how to diagnose and fix common problems to maintain optimal vehicle performance.

Learn all about the P0646 code, what causes A/C clutch relay control circuit low, and how to diagnose and fix common issues to maintain optimal engine performance.

Learn all about the P0647 code, what causes A/C clutch relay control circuit high, and how to diagnose and fix common issues to maintain optimal engine performance.

Learn all about the P0648 code, what causes immobilizer lamp control circuit issues, and how to diagnose and fix common problems to maintain optimal vehicle performance.

Learn all about the P0649 code, what causes speed control lamp control circuit issues, and how to diagnose and fix common issues to maintain optimal engine performance.

Learn all about the P064A code, what causes fuel pump control module issues, and how to diagnose and fix common issues to maintain optimal engine performance.

Learn all about the P064B code, what causes PTO control module failure, and how to diagnose and fix common issues to maintain optimal engine performance.

Learn all about the P064C code, what causes issues with the glow plug control module, and how to diagnose and fix common problems to maintain optimal engine performance.

Learn all about the P064D code, what causes internal control module O2 sensor processor performance issues, and how to diagnose and fix common problems to maintain optimal engine performance.