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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1841 (DTC INDEX)CHARGING DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Charging DTCS
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Charging DTCS
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 GMC C3500 HD, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CHARGING DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC P0562 | LOW SYSTEM VOLTAGE |
| DTC P0563 | HIGH SYSTEM VOLTAGE |
| DTC P0615 | IMPROPER VOLTAGE LEVEL ON THE OUTPUT CIRCUIT THAT CONTROLS THE STARTER RELAY |
| DTC P0621 | HIGH GENERATOR TURN ON SIGNAL |
| DTC P0622 | IMPROPER PULSE WIDTH MODULATED SIGNAL (GASOLINE ENGINE) |
| DTC P0622 | IMPROPER PULSE WIDTH MODULATED SIGNAL (DIESEL ENGINE) |
| DTC P1637 | GENERATOR TURN-ON SIGNAL CIRCUIT VOLTAGE OUT OF RANGE |
| DTC P1638 | PULSE WIDTH MODULATION SIGNAL OUT OF RANGE |
RENDER: 1.0x
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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.