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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 353 (BODY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1440: POWER MODE MASTER INPUT CIRCUITS MISMATCHCONDITIONS FOR SETTING THE DTC
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Conditions for Setting the DTC
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
One of the 3 monitored ignition switch circuits has malfunctioned. The DTC will set, if one of the following situations is present:
Incorrect Ignition Switch Inputs
| BCM Input and Scan Tool Display | Engine Running | ||
|---|---|---|---|
| Ignition Accessory | Ignition 1 | Ignition 0 | |
| Inactive | On | Off | No |
| Active | Off | Off | No |
| Active | On | Off | No |
| Inactive | On | Off | Yes |
| Inactive1 | On | On | Yes |
| Active | Off | Off | Yes |
| Active | Off | On | Yes |
| Active | On | Off | Yes |
| 1 The module sets the DTC 1 minute after it detects the condition. | |||
RENDER: 1.0x
NO RELATED
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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.