P1048 2017 Chevrolet Silverado Code - Reductant Injector High Control Circuit Low Voltage

P1048 indicates an issue with the reductant injector high control circuit, specifically low voltage, which can affect the diesel exhaust fluid (DEF) injection system.

Common symptoms include the check engine light turning on, reduced engine power, poor DEF system performance, and possible increased emissions.

Potential causes include a faulty reductant injector, damaged wiring or connectors in the reductant injector circuit, a failing reductant control module, or a weak battery affecting system voltage.

Driving with this code for extended periods is not recommended, as it can lead to increased emissions and possible damage to the DEF system or catalytic converter.

Start by inspecting the reductant injector wiring and connectors for damage or corrosion. Then, test the voltage and continuity of the circuit and check the reductant pump and control module for faults.

Repairs may include replacing the reductant injector, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the reductant control module.

Repair costs vary but can range from $100 to $500, depending on whether the issue is a simple wiring repair or requires component replacement.

Yes, a weak battery can cause low voltage in the reductant control circuit, potentially triggering the P1048 code.

Clearing the code may turn off the check engine light temporarily, but the issue will likely return unless the root cause is properly addressed.

Depending on the vehicle’s mileage and warranty terms, the repair may be covered under the emissions or powertrain warranty. Check with your dealership for details.