P1103 Buick Code - Water In Fuel Signal Message Counter Incorrect

P1103 indicates "Water In Fuel Signal Message Counter Incorrect," which typically points to an issue with the fuel quality sensor or its communication with the vehicle's computer.

Symptoms may include the check engine light turning on, poor engine performance, reduced fuel efficiency, or difficulty starting the engine.

The code may be triggered by contaminated fuel, a faulty fuel quality sensor, damaged wiring, or a problem with the vehicle's engine control module (ECM).

Yes, driving with this code can potentially harm the engine if water contamination in the fuel is left unresolved, as it can lead to misfires or damage to the fuel system.

Start by checking for water or contaminants in the fuel, inspecting the fuel quality sensor for damage, and examining the wiring and connectors for corrosion or loose connections.

Repairs may include draining the fuel tank, replacing the fuel quality sensor, cleaning or repairing wiring, or reprogramming the ECM if necessary.

Refueling with clean, high-quality fuel may resolve the issue if the code was triggered by a temporary contamination, but further inspection is advised to rule out other causes.

You’ll need an OBDII scanner to read and clear the code, a multimeter to check electrical connections, and possibly tools to inspect or replace the fuel sensor.

The repair cost depends on the exact issue, but fuel sensor replacement typically ranges from $100 to $300, excluding labor.

Yes, poor-quality or contaminated fuel with water content can trigger this code, but it’s important to verify the sensor and wiring are functioning properly.