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Engine-Codes – Saturn – P1122 Saturn

P1122 Saturn Code - Throttle Position Sensor Circuit Intermittent Low Voltage

Quick Answer

The P1122 code for a Saturn vehicle indicates an issue with the Throttle Position Sensor (TPS) circuit experiencing intermittent low voltage. Common causes include Faulty Throttle Position Sensor (TPS), Corrosion or loose connections in the TPS circuit wiring, Issues with the ECM or related control modules. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1122 Saturn indicates Throttle Position Sensor Circuit Intermittent Low Voltage.
Common causes
Common causes include Faulty Throttle Position Sensor (TPS), Corrosion or loose connections in the TPS circuit wiring, Issues with the ECM or related control modules.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 05, 2024
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Code P1122 Saturn Description

The P1122 code for a Saturn vehicle indicates an issue with the Throttle Position Sensor (TPS) circuit experiencing intermittent low voltage. The TPS is a crucial component that monitors the position of the throttle valve, which regulates the amount of air entering the engine. When the TPS circuit detects low voltage intermittently, it can disrupt the engine's performance by providing incorrect data to the engine control module (ECM). This can lead to poor acceleration, rough idling, stalling, and decreased fuel efficiency. If not addressed promptly, this issue can potentially cause further damage to the engine and other related systems.

OBDII Code P1122 Saturn - Throttle Position Sensor Circuit Intermittent Low Voltage
P1122 Saturn Code - Throttle Position Sensor Circuit Intermittent Low Voltage

Common Causes of P1122 Saturn

  1. Faulty Throttle Position Sensor (TPS).
  2. Corrosion or loose connections in the TPS circuit wiring.
  3. Issues with the ECM or related control modules.
  4. Vacuum leaks in the intake system affecting TPS readings.
  5. Electrical issues such as a blown fuse or short circuit in the TPS circuit.

Symptoms of P1122 Saturn

  1. Poor acceleration or hesitation when pressing the gas pedal.
  2. Rough idling or fluctuating idle speed.
  3. Engine stalling or shutting off unexpectedly.
  4. Decreased fuel efficiency.
  5. Illumination of the Check Engine Light on the dashboard.

How to Fix P1122 Saturn

  1. Begin by conducting a thorough inspection of the TPS circuit wiring and connectors for any signs of damage, corrosion, or loose connections.
  2. Test the Throttle Position Sensor using a multimeter to check for proper voltage readings and signal output.
  3. If the TPS is faulty, replace it with a new OEM or high-quality aftermarket sensor.
  4. Clear the diagnostic trouble codes from the ECM using a scan tool and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to pinpoint any underlying issues with the ECM or other related components.

Cost to Fix P1122 Saturn

The typical repair cost for addressing a P1122 code related to the Throttle Position Sensor circuit in a Saturn vehicle can range from $150 to $300, including parts and labor. However, actual costs may vary depending on the specific diagnosis time, labor rates, and parts pricing at different auto repair shops. It's recommended to obtain quotes from local shops to get a more accurate estimate for the repair.

When is the Code Detected?

When the Powertrain Control Module (PCM) senses a signal voltage lower than the normal operating range of the sensor, the P1121 will set.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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