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P1600: PCM TCM Serial Communication Circuit Fault

SUZUKI VOLKSWAGEN OTHER FORD JAGUAR LINCOLN MAZDA MERCURY
Severity
Medium
System
Manufacturer-Specific Powertrain

What Does P1600 Mean?

P1600 is a manufacturer-specific diagnostic trouble code: PCM TCM Serial Communication Circuit Fault. This code applies to SUZUKI, VOLKSWAGEN, OTHER, FORD, JAGUAR vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1600

Common Causes

Frequently Asked Questions

What does P1600 mean?
P1600 indicates: PCM TCM Serial Communication Circuit Fault. The vehicle's computer has detected that the PCM TCM Serial Communication is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P1600?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1600 for extended periods may cause additional problems.
How much does it cost to fix P1600?
Repair costs for P1600 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and repair PCM TCM Serial Communication wiring and connectors
  • 🔧 Replace faulty PCM TCM Serial Communication
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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P1601 Powertrain Control Module Communication Line To TCM Error P1602 Powertrain Control Module Communication Line To TCM Error, Immobilizer System Communication Error With Powertrain Control Module P1603 Control Module Self Test Torque Monitoring P1604 Control Module Self Test Speed Monitoring P1605 Powertrain Control Module Keep Alive Memory Test Error P1606 Rough Road Spec Engine Torque ABS ECU Electrical Malfunction P1607 Vehicle Speed Signal Error Message From Instrument Cluster P1608 Steering Angle Signal Error Message From Steering Angle Sensor P1609 Internal Control Module CPU To CPU Communication Failure P1610 Voltage Supply Missing Or Relay Module K40