Engine Error
P0604
Internal Control Module Random Access Memory (RAM) Error
Severity
High
Symptoms
Erratic shifting, stalling, engine surge, no start
Common Causes
- Internal PCM hardware failure (RAM)
- Water intrusion into engine computer
- Severe voltage spike
- Corroded ground to PCM
How to Fix
- 1 Inspect PCM for water damage
- 2 Check charging system voltage
- 3 Clean PCM ground wires
- 4 Replace the PCM
Estimated Repair Cost
USD
$100
–
$1200
Diagnostics: $100 - $200; PCM replacement: $500 - $1,200