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Home/DTC Codes/Chevrolet/S-10/1994-2004 2.2L I4/P1121
P1121

TP Sensor Circuit Intermittent High Voltage

1994-2004 Chevrolet S-10 2.2L I4

Moderate SeverityPowertrain

Description

The PCM detected intermittent high voltage spikes from the Throttle Position Sensor circuit.

Symptoms

  • Check Engine Light (intermittent)
  • Momentary surge or hesitation
  • Erratic idle
  • Intermittent Reduced Engine Power

Common Causes

  • Loose TP sensor connector
  • Intermittent wiring fault
  • Worn TP sensor
  • Carbon buildup on throttle blade

Diagnostic Steps

  1. Wiggle test TP sensor connector while monitoring
  2. Inspect wiring for chafing
  3. Test TP sensor through full range
  4. Check for carbon buildup in throttle body

Repair Notes

Clean throttle body. Repair connector or replace TP sensor/throttle body.

Related Codes

P0121Throttle/Pedal Position Sensor/Switch A Circuit Range/PerformanceP0123Throttle/Pedal Position Sensor/Switch A Circuit High InputP1120Throttle Position Sensor Out of Range LowP1120Throttle Position Sensor Out of Range LowP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Accelerator Pedal Position Sensor CircuitP1120Accelerator Pedal Position Sensor CircuitP1120Throttle Position Sensor Out of Range LowP1120Accelerator Pedal Position Sensor CircuitP1120Secondary Throttle Position Sensor CircuitP1120Throttle Position Sensor Out of Range LowP1120Secondary Throttle Position Sensor CircuitP1122Throttle Position Higher Than ExpectedP1122Throttle Position Higher Than Expected

Other Powertrain Codes

P1121 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 P1121 mean on a 1994-2004 Chevrolet S-10?

P1121 stands for "TP Sensor Circuit Intermittent High Voltage". The PCM detected intermittent high voltage spikes from the Throttle Position Sensor circuit.

What are the symptoms of P1121 on a Chevrolet S-10?

Common symptoms of P1121 include: Check Engine Light (intermittent), Momentary surge or hesitation, Erratic idle, Intermittent Reduced Engine Power.

What causes P1121 on a 1994-2004 Chevrolet S-10?

Common causes of P1121 include: Loose TP sensor connector, Intermittent wiring fault, Worn TP sensor, Carbon buildup on throttle blade.

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