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Home/DTC Codes/Chevrolet/Impala/2000-2005 3.4L V6/P1625
P1625

PCM System Reset

2000-2005 Chevrolet Impala 3.4L V6

High SeverityPowertrain

Description

The PCM has experienced an unexpected reset during operation. This can indicate a power supply issue or internal PCM fault.

Symptoms

  • Check Engine Light
  • Engine momentary stumble
  • Loss of adaptive data
  • Multiple codes may be stored

Common Causes

  • Intermittent power supply to PCM
  • Loose PCM connector
  • Internal PCM failure
  • Low battery voltage
  • Ignition switch issue

Diagnostic Steps

  1. Check all PCM power and ground circuits
  2. Inspect PCM connectors
  3. Test battery and charging system
  4. Monitor PCM power with oscilloscope for dropouts
  5. Check ignition switch

Repair Notes

Check PCM power and ground connections. Verify battery and charging system. Replace PCM if internal fault confirmed.

Related Codes

P1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600Loss of KAM Power Circuit OpenP1600PCM Battery Direct Power CircuitP1600ECM Battery Backup CircuitP1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1621PCM 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)P1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Keep Alive Power Voltage Too LowP1633Ignition Supply Power Circuit Low VoltageP1633ECM Malfunction ETCS CircuitP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633ECM Malfunction ETCS CircuitP1633Keep Alive Power Voltage Too LowP1633KAM Voltage Too LowP1633Ignition Supply Power Circuit Low VoltageP1633Keep Alive Power Voltage Too LowP1633ECM Malfunction ETCS CircuitP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Charging System Voltage LowP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Charging System Voltage Low

Other Powertrain Codes

P1625 on Other Vehicles

Chevrolet Astro

1995-2005 4.3L V6 Vortec

Chevrolet Avalanche

2002-2006 5.3L V8 Vortec

Chevrolet Avalanche

2002-2006 8.1L V8 Vortec

Chevrolet Avalanche

2007-2013 5.3L V8 Vortec

Chevrolet Avalanche

2007-2013 6.0L V8 Vortec

Chevrolet Aveo

2012-2018 1.6L I4

Chevrolet Beat

2018-2021 1.2L I4

Chevrolet Beretta

1990-1996 2.2L I4

Common Questions

What does code P1625 mean on a 2000-2005 Chevrolet Impala?

P1625 stands for "PCM System Reset". The PCM has experienced an unexpected reset during operation. This can indicate a power supply issue or internal PCM fault.

What are the symptoms of P1625 on a Chevrolet Impala?

Common symptoms of P1625 include: Check Engine Light, Engine momentary stumble, Loss of adaptive data, Multiple codes may be stored.

What causes P1625 on a 2000-2005 Chevrolet Impala?

Common causes of P1625 include: Intermittent power supply to PCM, Loose PCM connector, Internal PCM failure, Low battery voltage, Ignition switch issue.

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