What does P1114 mean on a Chevy?

P1114. Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage. Applies to Silverado, Sierra, Tahoe, Impala, Malibu.

What causes P1114 on a Chevy?

Failing ECT sensor with intermittent internal short ECT signal wire chafed to ground near the thermostat housing Coolant intrusion into the ECT connector Low coolant level exposing the ECT sensor tip Corroded ground splice shared with the ECT circuit

How do I fix P1114 on a Chevy?

Graph ECT on a Tech2 or GDS2 and look for sudden hot spikes Inspect the ECT connector for coolant wicking and green corrosion Wiggle-test the ECT harness while watching live temperature Verify coolant level and bleed air from the cooling system Replace the ECT sensor only if resistance is out of spec, then clear and verify warm-up curve

Code

P1114

Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Silverado, Sierra, Tahoe, Impala, Malibu
Related: P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) on OBD Codes List

What it means

P1114. Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Impala, Malibu.

Findings, check these first

Failing ECT sensor with intermittent internal short
ECT signal wire chafed to ground near the thermostat housing
Coolant intrusion into the ECT connector
Low coolant level exposing the ECT sensor tip
Corroded ground splice shared with the ECT circuit

Standard procedure

Graph ECT on a Tech2 or GDS2 and look for sudden hot spikes
Inspect the ECT connector for coolant wicking and green corrosion
Wiggle-test the ECT harness while watching live temperature
Verify coolant level and bleed air from the cooling system
Replace the ECT sensor only if resistance is out of spec, then clear and verify warm-up curve

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Sources and review

Review: no source links are recorded for this entry.

Last updated 2026-09-13.

Report a correction for P1114. Include your vehicle, the issue and a source if you have one.