P1634
Ignition 1 Power Circuit Low Voltage
2002-2009 GMC Envoy 4.2L I6
High SeverityPowertrain
Description
The PCM detected low voltage on the Ignition 1 power supply circuit.
Symptoms
- Check Engine Light
- Engine stalling
- Erratic gauges
- Multiple system malfunctions
Common Causes
- Faulty ignition switch
- Blown Ignition 1 fuse
- Corroded connections
- Damaged wiring in ignition circuit
Diagnostic Steps
- Test Ignition 1 circuit voltage at PCM
- Check Ignition 1 fuse
- Test ignition switch
- Inspect wiring and connectors
Repair Notes
Check fuse and ignition switch. Repair wiring as needed.
Related Codes
P1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600Loss of KAM Power Circuit OpenP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600ECM Battery Backup CircuitP1633ECM Malfunction ETCS CircuitP1633Keep 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 CircuitP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Charging System Voltage LowP1682Charging System Voltage LowP1682Charging System Voltage LowP1682Ignition 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)
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
P1634 on Other Vehicles
Common Questions
What does code P1634 mean on a 2002-2009 GMC Envoy?
P1634 stands for "Ignition 1 Power Circuit Low Voltage". The PCM detected low voltage on the Ignition 1 power supply circuit.
What are the symptoms of P1634 on a GMC Envoy?
Common symptoms of P1634 include: Check Engine Light, Engine stalling, Erratic gauges, Multiple system malfunctions.
What causes P1634 on a 2002-2009 GMC Envoy?
Common causes of P1634 include: Faulty ignition switch, Blown Ignition 1 fuse, Corroded connections, Damaged wiring in ignition circuit.