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Home/DTC Codes/Cadillac/XTS/2013-2019 3.6L V6/P1633
P1633

Ignition Supply Power Circuit Low Voltage

2013-2019 Cadillac XTS 3.6L V6

High SeverityPowertrain

Description

The PCM detected low voltage on its ignition supply power circuit. The ignition power circuit provides run/start voltage to the PCM.

Symptoms

  • Check Engine Light
  • Engine stalling
  • Poor performance
  • Intermittent no-start
  • Multiple erratic codes

Common Causes

  • Faulty ignition switch
  • Loose ignition power connection
  • Blown fuse
  • Damaged wiring
  • Corroded ignition switch connector

Diagnostic Steps

  1. Test voltage at PCM ignition power circuit
  2. Check ignition switch output
  3. Inspect ignition power fuse
  4. Test wiring for resistance
  5. Check connector at ignition switch

Repair Notes

Check ignition switch, fuse, and wiring. Replace ignition switch if voltage output is low.

Related Codes

P1600ECM Battery Backup CircuitP1600Loss of KAM Power — Open CircuitP1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600ECM Battery Backup CircuitP1600Loss of KAM Power Circuit OpenP1600ECM Battery Backup CircuitP1600Loss of KAM Power — Open CircuitP1634Ignition 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 VoltageP1634Ignition 1 Power Circuit Low VoltageP1634Accelerator Pedal Kickdown SwitchP1634Ignition 1 Power Circuit Low VoltageP1634Ignition 1 Power Circuit Low VoltageP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging 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)

Other Powertrain Codes

P1633 on Other Vehicles

Cadillac ATS

2013-2019 2.0L Turbo I4

Cadillac ATS

2013-2019 2.5L I4

Cadillac ATS-V

2016-2019 3.6L Twin-Turbo V6

Cadillac CT4

2020-2024 2.0L Turbo I4

Cadillac CT4

2020-2024 2.7L Turbo I4

Cadillac CT4-V

2020-2024 2.7L Turbo I4

Cadillac CT4-V Blackwing

2022-2024 3.6L Twin-Turbo V6

Cadillac CT5

2020-2024 2.0L Turbo I4

Common Questions

What does code P1633 mean on a 2013-2019 Cadillac XTS?

P1633 stands for "Ignition Supply Power Circuit Low Voltage". The PCM detected low voltage on its ignition supply power circuit. The ignition power circuit provides run/start voltage to the PCM.

What are the symptoms of P1633 on a Cadillac XTS?

Common symptoms of P1633 include: Check Engine Light, Engine stalling, Poor performance, Intermittent no-start, Multiple erratic codes.

What causes P1633 on a 2013-2019 Cadillac XTS?

Common causes of P1633 include: Faulty ignition switch, Loose ignition power connection, Blown fuse, Damaged wiring, Corroded ignition switch connector.

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