P26E3

Code

Generic P — Powertrain

Fuel Mode Indicator Lamp Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 42 EN: 36 RU: 29

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Fuel Mode Indicator lamp behaves incorrectly (stays on, fades, or does not respond)
Lamp may be constantly illuminated or not respond to control commands
Illumination level inconsistent or flickering
Relevant diagnostic trouble code stored and possible MIL illumination if related
Other related network or body module oddities if the circuit is shared

Retrieve freeze frame and live data with a scan tool; note lamp status and related currents/voltages if available
Visually inspect lamp, socket, wiring harness, and connectors for corrosion, damage, or aftermarket splices
Check for service bulletins or known issues for the vehicle (if available)
Check for other codes that might indicate shared-circuit problems
Confirm correct lamp/bulb type and installation

Expected: With lamp off, control circuit at near battery voltage (approx. 11–14 V depending on battery/ignition state)
Expected: When module actively grounds/sinks to illuminate lamp, control circuit near 0–1 V
Fault indication (High): control circuit remains at or above battery voltage when module expects it lower, or measures higher-than-battery in some fault conditions
Typical lamp resistance: depends on bulb/LED assembly; compare to known-good specification if available

Read and record freeze frame and any related DTCs. Clear codes and see if DTC returns.
Perform a detailed visual inspection of the lamp, socket, harness, and connectors for corrosion, bent pins, or damage.
With ignition ON (engine off), measure voltage at the lamp connector: note voltage at pin with lamp connected and with connector disconnected.
Use a scan tool to command the fuel mode indicator ON and OFF while measuring the circuit voltage to confirm module control and circuit response.
Check continuity of the control wire to the module and to ground as needed; check for short to battery by backprobing wiring and checking voltage with harness connectors disconnected.
If the lamp is LED module, disconnect the lamp assembly. If code clears with lamp disconnected, suspect lamp/assembly or short in assembly wiring.
If wiring and lamp check OK, swap or test the indicator lamp with a known-good unit or bench test the lamp to verify condition.
Repair any damaged wiring, connectors, or lamp assembly. After repairs, clear codes and verify proper lamp operation and that DTC does not return.
If wiring and lamp are good and issue persists, consider replacement or repair of the controlling module output (consult service manual and follow safety/anti-theft module procedures).