Reference meaning
What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Narrow by vehicle
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Scan worksheet →Manufacturer communications
1Original wording in English
CHEVROLET, GMC
This Preliminary Information communication provides information to the technician about vehicles that have Misfire, rough running, surge, chuggle, and possible Service Engine Soon Malfunction Indicator Lamp on. Technician may find Diagnostic Trouble Codes P1223, P1226, P1229, P1232, P1235, P1238, P1241 or P1244. Technician shoul…
Check vehicle applicability
14A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Chevrolet | F SERIES ↗ | 2005 |
| Chevrolet | F SERIES ↗ | 2004 |
| Chevrolet | SILVERADO 1500 HD ↗ | 2005 |
| Chevrolet | SILVERADO 1500 HD ↗ | 2004 |
| Chevrolet | SILVERADO 2500 ↗ | 2005 |
| Chevrolet | SILVERADO 2500 ↗ | 2004 |
| GMC | G VAN BUS ↗ | 2005 |
| GMC | G VAN BUS ↗ | 2004 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Fuel Pump Speed Primary Circuit Malfunction
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.