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P1122 Cadillac Code - Throttle Position Sensor Circuit Intermittent Low Voltage

Quick Answer

The P1122 Cadillac code refers to an issue with the Throttle Position Sensor (TPS) circuit having intermittent low voltage. Common causes include Faulty TPS sensor: The TPS sensor itself may be malfunctioning, causing intermittent low voltage readings, Wiring issues: Damaged or corroded wiring connecting the TPS sensor to the ECU can lead to intermittent low voltage signals, Poor electrical connection: Loose or poor electrical connections between the TPS sensor and ECU can disrupt voltage signals. 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 Cadillac indicates Throttle Position Sensor Circuit Intermittent Low Voltage.
Common causes
Common causes include Faulty TPS sensor: The TPS sensor itself may be malfunctioning, causing intermittent low voltage readings, Wiring issues: Damaged or corroded wiring connecting the TPS sensor to the ECU can lead to intermittent low voltage signals, Poor electrical connection: Loose or poor electrical connections between the TPS sensor and ECU can disrupt voltage signals.
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 10, 2024
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Code P1122 Cadillac Description

The P1122 Cadillac code refers to an issue with the Throttle Position Sensor (TPS) circuit having intermittent low voltage. The TPS is a crucial component of the vehicle's fuel injection system, as it monitors the position of the throttle valve and sends this information to the engine control unit (ECU). This allows the ECU to adjust the air-fuel mixture for optimal engine performance and fuel efficiency. When the TPS circuit is experiencing low voltage intermittently, it can lead to various performance issues and potentially cause long-term damage to the engine if not addressed promptly.

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

Common Causes of P1122 Cadillac

  1. Faulty TPS sensor: The TPS sensor itself may be malfunctioning, causing intermittent low voltage readings.
  2. Wiring issues: Damaged or corroded wiring connecting the TPS sensor to the ECU can lead to intermittent low voltage signals.
  3. Poor electrical connection: Loose or poor electrical connections between the TPS sensor and ECU can disrupt voltage signals.
  4. ECU malfunction: A malfunctioning ECU can also cause intermittent low voltage readings from the TPS sensor.

Symptoms of P1122 Cadillac

  1. Rough idling or stalling: The engine may idle roughly or stall frequently due to incorrect air-fuel mixture adjustments.
  2. Reduced fuel efficiency: The vehicle may experience decreased fuel efficiency as a result of the TPS circuit issue.
  3. Lack of throttle response: The vehicle may exhibit delayed or unresponsive throttle response when accelerating.
  4. Check Engine Light: The Check Engine Light may illuminate on the dashboard as a result of the TPS circuit problem.

How to Fix P1122 Cadillac

  1. Diagnostic scan: Use a diagnostic scan tool to read the code and identify the specific issue with the TPS circuit.
  2. Inspect TPS sensor: Check the TPS sensor for any visible damage or signs of wear. Replace the sensor if necessary.
  3. Check wiring: Inspect the wiring connecting the TPS sensor to the ECU for any damage or corrosion. Repair or replace any damaged wiring.
  4. Test electrical connections: Ensure that the electrical connections between the TPS sensor and ECU are secure and free of corrosion.
  5. Clear codes: Clear the diagnostic trouble codes from the ECU after completing the repair to reset the system and ensure the issue has been resolved.

Cost to Fix P1122 Cadillac

The typical repair costs for addressing a P1122 Cadillac code related to the Throttle Position Sensor circuit intermittent low voltage can range from $150 to $400. This cost includes the price of a new TPS sensor, any necessary wiring repairs, and labor charges. However, it's important to note that the actual cost can vary based on factors such as the vehicle make and model, the location of the repair shop, and any additional issues that may be present. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on your specific circumstances.

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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