Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- The system is designed for use of regular unleaded fuel to any ethanol concentration up to 85 percent (E85).
- When the ambient temperature drops below -10° C (+14° F), a winter blend of 70 percent (E70), or less is recommended for cold weather starting.
- The use of methanol fuels may set this DTC.
- Use of methanol fuel or high concentration of ethanol may cause DTCs P0169 and P0179 to set.
- Other contamination such as water and salts may cause this DTC to set.
The table below shows the maximum thresholds of a given ethanol content (percentage) versus the ambient temperature at which a DTC P0169 will set.
DTC P0169
| Temperature | Ethanol Content | Frequency Hz |
|---|---|---|
| -40° C (-40° F) and colder | 55% | 105 Hz |
| From -30 to -10° C (-22 to + 14° F) | 76% | 126 Hz |
| -5° C (+23° F) | 81% | 131 Hz |
| 0° C (32° F) and warmer | 88% | 138 Hz |