P159F
Fuel Economy Mode Switch Circuit Low Voltage
P159F is an OBD-II diagnostic trouble code meaning: Fuel Economy Mode Switch Circuit Low Voltage. Common causes: open or short circuit in switch circuit, fuel economy mode switch malfunction. Estimated repair cost: $6–33.
Symptoms
- Inability to activate fuel economy mode
- Check Engine Light on Dashboard
- No response when pressing the fuel economy switch
- Reduced overall fuel efficiency
Causes
- Open or short circuit in switch circuit
- Fuel economy mode switch malfunction
- Problems with the wiring harness or connectors
- Engine control unit (ECU) malfunction
- Corrosion of contacts in the circuit
How to Fix
- Check the continuity of the switch circuit
- Check the condition of connectors and contacts
- Test the fuel economy switch
- Check the voltage in the circuit using a multimeter
- If necessary, replace the switch or repair the wiring
Related codes
FAQ
What does the P159F code mean?
P159F is an OBD-II diagnostic trouble code that indicates: Fuel Economy Mode Switch Circuit Low Voltage
What causes a P159F error code?
The most common causes of P159F include: Open or short circuit in switch circuit; Fuel economy mode switch malfunction; Problems with the wiring harness or connectors; Engine control unit (ECU) malfunction.
How do I fix a P159F diagnostic trouble code?
To fix P159F: Check the continuity of the switch circuit. Check the condition of connectors and contacts. Test the fuel economy switch. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P159F?
Yes, but get it checked soon
How much does it cost to fix P159F?
The estimated repair cost for P159F is $6–33. Actual cost depends on your vehicle, location, and labor rates.
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