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
6Original wording in English
BUICK, CHEVROLET, GMC, OLDSMOBILE
REDUCED POWER LIGHT ON AND DIAGNOSTIC TROUBLE CODE P1680 P1221 AND/OR P1271 STORED IN THE POWER CONTROL MODULE. *SC
CHEVROLET, GMC, OLDSMOBILE
DIAGNOSTIC TROUBLE CODES P1271, P1275 LOW POWER.*MR
HONDA
SUBJECT REGARDING MULTIPLE APS DIAGNOSTIC TROUBLE CODES P1271, P1272, P1273, P0121. *TT
ISUZU
SOME ENGINES MAY OCASSIONALLY EXPERIENCE IDLE FLUCTUATION AND / OR THE MALFUNCTION INDICATOR LAMP WILL ILLUMINATE BECAUSE AN ACCELERATOR POSITION SENSOR (APS) DIAGNOSTIC TROUBLE CODE P1271, P1273, P1275, P1280, OR P1285 IS SET. *TT
Check vehicle applicability
21A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Buick | RAINIER ↗ | 2005 |
| Buick | RAINIER ↗ | 2004 |
| Chevrolet | TRAILBLAZER ↗ | 2004 |
| Chevrolet | TRAILBLAZER ↗ | 2003 |
| Chevrolet | TRAILBLAZER ↗ | 2002 |
| GMC | ENVOY ↗ | 2005 |
| GMC | ENVOY ↗ | 2004 |
| GMC | ENVOY ↗ | 2003 |
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Cylinder #1 High To Low Side Open
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.