Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2014EXPRESS 2500 BASE, VAN CARGO, 6.6L ENG VIN LREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEIGNITION SWITCH/STEERING LOCKWIRING SYSTEMS AND POWER MANAGEMENT - DIAGNOSTIC INFORMATION AND PROCEDURES
2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN L
Wiring Systems And Power Management - Diagnostic Information And Procedures
2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN LSECTION Wiring Systems And Power Management - Diagnostic Information And Procedures
- Diagnostic Information and Procedures
- DTC B0005
- DTC B1370-B1379, B1380-B1389 or B1440-B1443
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B1428
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B1433
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B1475
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P2534 or P2535 (4L60-E, 4L65-E, 4L70-E)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P2534 or P2535 (6L45, 6L50, 6L80, 6L90)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P2537 (6L45, 6L50, 6L80, 6L90)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P2537 (4L60-E, 4L65-E, 4L70-E)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Symptoms - Wiring Systems
- Power Mode Mismatch
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- Retained Accessory Power Malfunction
- General Electrical Diagnosis
- Checking Aftermarket Accessories
- Circuit Testing
- Using Connector Test Adapters
- Probing Electrical Connectors
- Troubleshooting with a Digital Multimeter
- Troubleshooting with a Test Lamp
- Using Fused Jumper Wires
- Measuring Voltage
- Measuring Voltage Drop
- Measuring Frequency
- Testing Ground and Low Reference Circuits
- Testing for Continuity
- Testing for Short to Ground
- Testing for a Short to Voltage
- Testing for Intermittent Conditions and Poor Connections
- Inducing Intermittent Fault Conditions
- Testing for Electrical Intermittents
- Scan Tool Snapshot Procedure
- Circuit Protection - Fuses
- Circuit Protection - Circuit Breakers
- Circuit Protection - Fusible Links
- Wiring Repairs
- Repairing Damaged Wire Insulation
- Coaxial Cable Repairs
- Flat Wire Repairs
- Folded-Over Wire Repair
- High Temperature Wiring Repairs
- Heated Oxygen Sensor Wiring Repairs
- Splicing Copper Wire Using Splice Sleeves
- Splicing Twisted or Shielded Cable
- Splicing Inline Harness Diodes
- SIR/SRS Wiring Repairs
- Connector Repairs
- Connector Position Assurance Locks
- Terminal Position Assurance Locks
- AFL/EPC Connectors
- Bosch Connectors (BSK)
- Bosch Connectors (0.64)
- Bosch Connectors (2.8 JPT)
- Bosch Connectors (ECM)
- Delphi Connectors (Weather Pack)
- Delphi Connectors (Push To Seat)
- Delphi Connectors (Pull To Seat)
- Delphi Connectors (Micro-Pack 100W)
- Delphi Connectors (Micro .64)
- Delphi Connectors (12-Way)
- Delphi Connectors (Steering Gear)
- FCI Connectors (Lever Lock)
- FCI Connectors (SIR)
- FEP Connectors (Steering Gear)
- JST Connectors
- Kostal Connectors (Glow Plug Control Module)
- Kostal Connectors (Transmission)
- Molex Connectors
- Sumitomo Connectors
- Tyco/AMP Connectors (CM 42-Way)
- Tyco/AMP Connectors (Sensor)
- Tyco/AMP Connectors (0.25 Cap)
- Tyco/AMP Connectors (43-Way)
- Tyco/AMP Connectors (Door Module)
- Tyco/AMP Connectors (102-Way Inline)
- Tyco/AMP Connectors (Seat)
- Tyco/AMP Connectors (SIR)
- Yazaki Connectors (2-Way)
- Yazaki Connectors (16-Way)
- Repairing Connector Terminals (Terminated Lead Repair)
- Repairing Connector Terminals (Terminal Repair)
- Terminal Removal
- Ignition Key Cannot Be Inserted, Rotated or Removed from the Ignition Lock Cylinder
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.