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Home/DTC Codes/Chevrolet/Express/2003-2024 4.3L V6/P1115
P1115

ECT Sensor Circuit Intermittent High Voltage

2003-2024 Chevrolet Express 4.3L V6

Moderate SeverityPowertrain

Description

The PCM detected intermittent high voltage on the Engine Coolant Temperature sensor circuit, indicating the sensor is sporadically reporting very low temperatures.

Symptoms

  • Check Engine Light
  • Rich running condition
  • Poor fuel economy
  • Cooling fans not activating when needed

Common Causes

  • Intermittent open in ECT circuit
  • Loose ECT connector
  • Faulty ECT sensor
  • Corroded terminals

Diagnostic Steps

  1. Monitor ECT readings for erratic spikes
  2. Wiggle test ECT connector
  3. Test sensor resistance across temperature range
  4. Check connector terminals

Repair Notes

Clean and secure ECT connector. Replace sensor if faulty.

Related Codes

P0115Engine Coolant Temperature (ECT) Sensor 1 CircuitP0117ECT Sensor 1 Circuit Low InputP0118ECT Sensor 1 Circuit High InputP1114ECT Sensor Circuit Intermittent Low VoltageP1114ECT Sensor Circuit Intermittent Low VoltageP1114ECT Sensor Circuit Intermittent Low VoltageP1114ECT Sensor Circuit Intermittent Low VoltageP1114ECT Sensor Circuit Intermittent Low VoltageP1114ECT Sensor Circuit Intermittent Low VoltageP1114ECT Sensor Circuit Intermittent Low VoltageP1114ECT Sensor Circuit Intermittent Low VoltageP1114Engine Coolant Temperature Sensor MalfunctionP1114Engine Coolant Temperature Sensor MalfunctionP1114Engine Coolant Temperature Sensor Malfunction

Other Powertrain Codes

P1115 on Other Vehicles

Chevrolet Astro

1995-2005 4.3L V6 Vortec

Chevrolet Avalanche

2002-2006 5.3L V8 Vortec

Chevrolet Avalanche

2002-2006 8.1L V8 Vortec

Chevrolet Avalanche

2007-2013 5.3L V8 Vortec

Chevrolet Avalanche

2007-2013 6.0L V8 Vortec

Chevrolet Aveo

2012-2018 1.6L I4

Chevrolet Beat

2018-2021 1.2L I4

Chevrolet Beretta

1990-1996 2.2L I4

Common Questions

What does code P1115 mean on a 2003-2024 Chevrolet Express?

P1115 stands for "ECT Sensor Circuit Intermittent High Voltage". The PCM detected intermittent high voltage on the Engine Coolant Temperature sensor circuit, indicating the sensor is sporadically reporting very low temperatures.

What are the symptoms of P1115 on a Chevrolet Express?

Common symptoms of P1115 include: Check Engine Light, Rich running condition, Poor fuel economy, Cooling fans not activating when needed.

What causes P1115 on a 2003-2024 Chevrolet Express?

Common causes of P1115 include: Intermittent open in ECT circuit, Loose ECT connector, Faulty ECT sensor, Corroded terminals.

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