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.
2003 Buick Century CustomFACTORY OEM SERVICE PROCEDURE
Automatic Transmission DTCS
TRANSMISSION, AUTOMATIC DIAGNOSTIC TROUBLE CODE (DTCS) LIST
| DTC | Description |
|---|---|
| DTC P0218 | TRANSAXLE FLUID OVERTEMPERATURE |
| DTC P0502 | VEHICLE SPEED SENSOR CIRCUIT (LOW INPUT) |
| DTC P0503 | VEHICLE SPEED SENSOR CIRCUIT PERFORMANCE |
| DTC P0711 | TRANSMISSION FLUID TEMPERATURE SENSOR CIRCUIT PERFORMANCE |
| DTC P0712 | TRANSMISSION FLUID TEMPERATURE SENSOR CIRCUIT (LOW INPUT) |
| DTC P0713 | TRANSMISSION FLUID TEMPERATURE SENSOR CIRCUIT (HIGH INPUT) |
| DTC P0716 | INPUT SPEED SENSOR CIRCUIT PERFORMANCE |
| DTC P0717 | INPUT SPEED SENSOR CIRCUIT NO SIGNAL |
| DTC P0719 | TCC BRAKE SWITCH CIRCUIT LOW INPUT (SWITCH STUCK ON) |
| DTC P0724 | TCC BRAKE SWITCH CIRCUIT HIGH INPUT (SWITCH STUCK OFF) |
| DTC P0730 | INCORRECT GEAR RATIO |
| DTC P0741 | TCC SYSTEM STUCK OFF |
| DTC P0742 | TCC SYSTEM STUCK ON |
| DTC P0748 | PRESSURE CONTROL SOLENOID ELECTRICAL PROBLEM |
| DTC P0751 | 1-2 SHIFT SOLENOID PERFORMANCE |
| DTC P0752 | 1-2 SHIFT SOLENOID PERFORMANCE |
| DTC P0753 | 1-2 SHIFT SOLENOID ELECTRICAL PROBLEM |
| DTC P0756 | 2-3 SHIFT SOLENOID PERFORMANCE |
| DTC P0757 | 2-3 SHIFT SOLENOID VALVE PERFORMANCE |
| DTC P0758 | 2-3 SHIFT SOLENOID ELECTRICAL PROBLEM |
| DTC P1811 | MAXIMUM ADAPT & LONG SHIFT |
| DTC P1814 | TORQUE CONVERTER OVERSTRESS |
| DTC P1819 | INTERNAL MODE SWITCH - NO START\WRONG RANGE |
| DTC P1820 | INTERNAL MODE SWITCH CIRCUIT A - LOW |
| DTC P1822 | INTERNAL MODE SWITCH CIRCUIT B - HIGH |
| DTC P1823 | INTERNAL MODE SWITCH CIRCUIT P - LOW |
| DTC P1825 | INTERNAL MODE SWITCH - ILLEGAL RANGE |
| DTC P1826 | INTERNAL MODE SWITCH CIRCUIT C - HIGH |
| DTC P1860 | TCC PULSE WIDTH MODULATED SOLENOID ELECTRICAL PROBLEM |
| DTC P1887 | TORQUE CONVERTER CLUTCH RELEASE SWITCH CIRCUIT MALFUNCTION |
Factory Service Tools
Use the Manual With the Right Hardware
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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.