P0117 Pontiac Code - Engine Coolant Temperature Circuit Low Input
Quick Answer
The Engine Coolant Temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor. 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
- P0117 Pontiac indicates Engine Coolant Temperature Circuit Low Input.
- Common causes
- Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor.
- 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.
Code P0117 Pontiac Description
The ECM uses this high side coolant rationality diagnostic to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the ignition is OFF. If the calibrated ignition OFF time is met at start-up, the ECM will compare the temperature difference between the ECT and the intake air temperature (IAT) to determine if the temperatures are within an acceptable operating range of each other. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a the ECT is warmer than 139°C (282°F) for greater than 5 s.
What are the Possible Causes of the DTC P0117 Pontiac?
- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature sensor harness is open or shorted
- Engine Coolant Temperature sensor electrical circuit poor connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0117 Pontiac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0117 Pontiac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0117 Pontiac Code
1. What does the OBDII code P0117 mean for a Pontiac?
P0117 indicates that the Engine Coolant Temperature (ECT) sensor is reporting an abnormally low voltage, which suggests an issue with the sensor or its circuit.
2. What are the common symptoms of P0117 in a Pontiac?
Symptoms may include poor fuel economy, rough idling, difficulty starting, engine overheating, or the temperature gauge showing incorrect readings.
3. What causes the P0117 code to appear on a Pontiac?
Common causes include a faulty ECT sensor, damaged wiring or connectors in the sensor circuit, a short to ground, or low engine coolant levels.
4. Can driving with a P0117 code damage my Pontiac?
Yes, driving with this code can lead to engine performance issues and potential overheating, which may cause long-term damage if not addressed promptly.
5. How do I diagnose the P0117 code on a Pontiac?
Diagnosis involves checking the ECT sensor's voltage signal, inspecting the wiring and connectors for damage, and ensuring that the coolant level and thermostat are functioning correctly.
6. How do I fix the P0117 code on my Pontiac?
Repairs may include replacing the ECT sensor, repairing damaged wiring or connectors, refilling or flushing the coolant, or replacing a faulty thermostat.
7. Can low coolant levels trigger the P0117 code in a Pontiac?
Yes, low coolant levels can cause the sensor to send incorrect readings, triggering the P0117 code.
8. How much does it cost to fix the P0117 code on a Pontiac?
Repair costs depend on the issue but typically range from $150 to $300, including parts and labor for replacing the ECT sensor or addressing wiring problems.
9. Can a faulty thermostat cause the P0117 code in a Pontiac?
Yes, a thermostat stuck open or closed can cause incorrect temperature readings, potentially triggering the P0117 code.
10. Will clearing the P0117 code fix the problem in my Pontiac?
Clearing the code will temporarily turn off the check engine light, but it won’t resolve the underlying issue causing the code to appear.
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