P1098 on 2021-2022 Chevrolet Silverado 1500 (LT, RST, LTZ, High Country) — Engine Coolant Control Valve Position Sensor Minimum Stop Performance
1 vehicles · 1 makes
Most Reported On
P1098 is an OBD-II diagnostic trouble code meaning “Engine Coolant Control Valve Position Sensor Minimum Stop Performance.” A manufacturer-specific code used by GM (Chevrolet, GMC, Cadillac, Buick) on vehicles with an electronic engine coolant flow control valve, and most prevalent on the 3.0L Duramax diesel (LM2/LZ0). The engine control module sets it when the valve's internal position sensor cannot confirm the expected minimum-stop position or reports a value inconsistent with what was commanded. Reported symptoms include a check engine light and cooling fans running at high speed as a failsafe. GM PI PIP5675G addresses P1098 and/or P26BB and identifies a software anomaly as the cause on affected vehicles, so a calibration update should be checked before replacing the valve. This code is most commonly reported on 2021-2022 Chevrolet Silverado 1500 (LT, RST, LTZ, High Country).
Common Causes
Diagnostic Tools
P1098 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does P1098 mean?
P1098 stands for "Engine Coolant Control Valve Position Sensor Minimum Stop Performance." A manufacturer-specific code used by GM (Chevrolet, GMC, Cadillac, Buick) on vehicles with an electronic engine coolant flow control valve, and most prevalent on the 3.0L Duramax diesel (LM2/LZ0). The engine control module sets it when the valve's internal position sensor cannot confirm the expected minimum-stop position or reports a value inconsistent with what was commanded. Reported symptoms include a check engine light and cooling fans running at high speed as a failsafe. GM PI PIP5675G addresses P1098 and/or P26BB and identifies a software anomaly as the cause on affected vehicles, so a calibration update should be checked before replacing the valve.
What are the most common causes of P1098?
The most common causes of P1098 are: Outdated ECM software calibration (check for the GM update per PIP5675G first), Failed engine coolant flow control valve assembly, Damaged or corroded valve connector and wiring, Low coolant level or air in the cooling system, Faulty engine control module (rare). The specific cause varies by vehicle.
How much does it cost to fix P1098?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P1098?
Au7o has documented P1098 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.