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.
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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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P1490EGR - Valve Stuck in open position fault
Manufacturer communications
3Original wording in English
PACCAR
Fix-As-Fail - On the MX-13 EPA13 engine, water may buildup and freeze on the EGR Pressure Difference Sensor (F751), causing a P1490 (EGR - Valve Stuck in open position fault) and resulting in a stop engine lamp.
ISUZU
ISUZU: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. SPECIAL POLICY ADJUSTMENT REGARDING THE VARIOUS DIAGNOSTIC TROUBLE CODES (DTC) P2201, P2206, P2207, P1490 OR P2000, HAVE BEEN SET DUE TO AN INTERNAL FAILURE OF SELECTIVE CATALYST REDUCTION (SCR) SYSTEM AND ILLUMINATING CHECK ENGINE MALFUNCTION INDICATOR LAMP (MIL), EXHAUST SYST…
NISSAN
MALFUNCTION INDICATOR LAMP (MIL) ON WITH DIAGNOSTIC TROUBLE CODES (DTCS) STORED P0444, P0447, P0605, P1122, P1444, P1490. *TT
Check vehicle applicability
9A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Code meaning and manufacturer information
Original wording in English · Historical directory labels; manufacturer applicability has not been established for every entry.
Secondary Air Relief Solenoid 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.