DTC P1602: Immobilizer To Pcm Communication Error: Condition

DTC is set when command from PCM to immobilizer unit exceeds limit or there is no response from immobilizer unit. Possible causes are:

• Open or short in immobilizer system.
• Immobilizer unit malfunction.
• Immobilizer key transponder malfunction
• Immobilizer coil malfunction.
• PCM malfunction.