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DTC P0601: Engine Control Module (ECM) Check Sum Error Or DTC P0604: Engine Control Module (ECM) Ram Error: Procedure

  1. Check continuity of BTN fuse (30-amp) in engine compartment fuse/relay box. Check continuity of ECM B+ fuse (10-amp) in passenger compartment fuse box. If either fuse is blown, locate and repair short to ground in appropriate wire, then replace fuse. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If both fuses are okay, go to next step.
  2. Backprobe and measure voltage between ECM connector terminal No. 26 (Pink wire) and ground. See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Pink wire between ECM and passenger compartment fuse box.
  3. Using scan tool, clear DTCs. Drive vehicle and monitor voltage at ECM connector terminal No. 26 (Pink wire). If voltage stays constant and pending code returns, replace ECM. If voltage fluctuates, check connectors for loose, damaged or corroded terminals. If problem exists, repair appropriate connector. If problem does not exist, check wiring harness for damaged or broken wires and repair as necessary.
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