Powertrain
generic / SAE
P25A4
Fuel Mode Select Switch Circuit
General electrical fault on the fuel mode select switch — used on bi-fuel vehicles (CNG/LPG/H2/gasoline) so the driver can pick the active fuel. With the input invalid, the ECM falls back to the default fuel and disables operator-selectable switching.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / A4
Possible causes
- Open or shorted switch wire high
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–350 €
- Estimated time: 0.3–1.5 h
- Component: fuel mode switch
- MIL / check engine light
Sources
References
sae:J2012