Diagnostic Trouble Code Definitions
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC (1) | Description | ||
|---|---|---|---|
| B1327 | Battery/Source Voltage | ||
| B1328 | Device Power Circuit High | ||
| P0562 | Low System Voltage | ||
| P0563 | High System Voltage | ||
| P0615 | Improper Voltage Level On The Output Circuit That Controls The Starter Relay | ||
| P0621 | High Generator Turn On Signal | ||
| P0622 (Gasoline Engine) | Improper Pulse Width Modulated Signal | ||
| P0622 (Diesel Engine) | Improper Pulse Width Modulated Signal | ||
| P1637 | Generator Turn-On Signal Circuit Voltage Out Of Range | ||
| P1638 | Pulse Width Modulation Signal Out Of Range | ||
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