What Does P2668 Mean?
The PCM has detected a fault in the control circuit for the Fuel Mode Indicator Lamp, which informs the driver of current fuel system operating mode. The circuit may be open, shorted, or the indicator lamp itself has failed.
Common Causes
40%
Burnt out fuel mode indicator bulb or failed LED display
25%
Open circuit in wiring between PCM and instrument cluster
20%
Failed instrument cluster circuit board or display module
10%
Corroded connector at instrument cluster
5%
PCM output driver failure for indicator lamp control
Diagnostic Steps
1
Step 1: Check if fuel mode indicator lamp illuminates during bulb check at key-on
2
Step 2: Access instrument cluster and verify bulb/LED condition and connections
3
Step 3: Check for voltage at indicator lamp circuit when PCM commands lamp on
4
Step 4: Verify continuity between PCM connector and instrument cluster lamp circuit
5
Step 5: Test PCM output signal with scan tool commanding lamp on/off
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
The PCM has detected a fault in the control circuit for the Fuel Mode Indicator Lamp, which informs the driver of current fuel system operating mode. The circuit may be open, shorted, or the indicator lamp itself has failed.
The most common cause of P2668 (Fuel Mode Indicator Lamp Control Circuit) is: Burnt out fuel mode indicator bulb or failed LED display
Typical repair costs for P2668 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety impact. Vehicle operates normally but driver lacks visual indication of fuel system mode. Safe to drive but repair when convenient.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2668 to identify the root cause.
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Quick Info
Category
Powertrain
System
Instrument Display / Information System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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