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Home/DTC Codes/Buick/Rainier/2004-2007 4.2L I6/P1600
P1600

PCM Battery Direct Power Circuit

2004-2007 Buick Rainier 4.2L I6

Moderate SeverityPowertrain

Description

The PCM detected an issue with its direct battery power supply circuit. This circuit maintains PCM memory and learned values when the ignition is off.

Symptoms

  • Check Engine Light
  • Lost adaptive memory
  • Poor idle after battery service
  • Transmission relearn needed
  • Multiple codes may set simultaneously

Common Causes

  • Low battery voltage
  • Corroded battery cables
  • Loose PCM power connection
  • Blown PCM power fuse
  • Damaged PCM power wiring

Diagnostic Steps

  1. Test battery voltage
  2. Inspect battery cable connections
  3. Check PCM power fuse
  4. Test voltage at PCM battery circuit
  5. Inspect PCM connector for corrosion

Repair Notes

Check battery and cable connections. Verify PCM power fuse. Clean and secure all connections.

Related Codes

P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1625PCM System ResetP1625PCM System ResetP1625PCM System ResetP1625PCM System ResetP1625PCM System ResetP1625PCM System ResetP1625PCM System ResetP1625PCM System ResetP1633Keep Alive Power Voltage Too LowP1633Keep Alive Power Voltage Too LowP1633Keep Alive Power Voltage Too LowP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633ECM Malfunction ETCS CircuitP1633KAM Voltage Too LowP1633ECM Malfunction ETCS CircuitP1633ECM Malfunction ETCS CircuitP1634Ignition 1 Power Circuit Low VoltageP1634Ignition 1 Power Circuit Low VoltageP1634Accelerator Pedal Kickdown SwitchP1634Ignition 1 Power Circuit Low VoltageP1634Ignition 1 Power Circuit Low VoltageP1634Ignition 1 Power Circuit Low VoltageP1634Ignition 1 Power Circuit Low VoltageP1634Ignition 1 Power Circuit Low VoltageP1634Accelerator Pedal Kickdown SwitchP1634Ignition 1 Power Circuit Low Voltage

Other Powertrain Codes

P1600 on Other Vehicles

Buick Century

1990-1996 2.5L I4

Buick Century

1990-1996 3.3L V6

Buick Century

1997-2005 3.1L V6

Buick Enclave

2008-2017 3.6L V6

Buick Enclave

2018-2024 3.6L V6

Buick Encore

2013-2024 1.4L Turbo I4

Buick Encore GX

2020-2024 1.2L Turbo I3

Buick Encore GX

2020-2024 1.3L Turbo I3

Common Questions

What does code P1600 mean on a 2004-2007 Buick Rainier?

P1600 stands for "PCM Battery Direct Power Circuit". The PCM detected an issue with its direct battery power supply circuit. This circuit maintains PCM memory and learned values when the ignition is off.

What are the symptoms of P1600 on a Buick Rainier?

Common symptoms of P1600 include: Check Engine Light, Lost adaptive memory, Poor idle after battery service, Transmission relearn needed, Multiple codes may set simultaneously.

What causes P1600 on a 2004-2007 Buick Rainier?

Common causes of P1600 include: Low battery voltage, Corroded battery cables, Loose PCM power connection, Blown PCM power fuse, Damaged PCM power wiring.

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