P1490 Cadillac Code - EVAP Purge Pump Voltage Sensor Performance
Quick Answer
Purge capacity is being reduced by technologies that improve fuel economy. Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection. 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
- P1490 Cadillac indicates EVAP Purge Pump Voltage Sensor Performance.
- Common causes
- Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection.
- 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 P1490 Cadillac Description
What are the Possible Causes of the DTC P1490 Cadillac?
- Faulty Evaporative Emission Purge Pump
- Evaporative Emission Purge Pump harness is open or shorted
- Evaporative Emission Purge Pump circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1490 Cadillac?
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 P1490 Cadillac 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 P1490 Cadillac Code
1. What does the OBDII code P1490 mean on a Cadillac?
P1490 indicates an issue with the EVAP (Evaporative Emission Control) purge pump voltage sensor, suggesting it isn't performing within the expected range.
2. What are the common symptoms of code P1490 in a Cadillac?
Symptoms may include an illuminated check engine light, poor fuel efficiency, difficulty starting the engine, or a slight fuel odor near the vehicle.
3. What causes the P1490 code to appear on a Cadillac?
Common causes include a faulty EVAP purge pump, damaged wiring or connectors, a malfunctioning purge pump voltage sensor, or a problem with the vehicle's PCM (Powertrain Control Module).
4. Can I drive my Cadillac with a P1490 code?
While the vehicle might still drive, it’s not recommended to ignore the code, as it indicates an emissions issue that can affect performance and may lead to more severe problems.
5. How is the P1490 code diagnosed in a Cadillac?
A technician will use an OBDII scanner to confirm the code, inspect the EVAP purge pump and related wiring, and test the voltage sensor for proper operation.
6. How can I fix the P1490 code on my Cadillac?
Repairs may involve replacing the EVAP purge pump, repairing or replacing damaged wiring, cleaning or replacing the sensor, or reprogramming the PCM if necessary.
7. What tools are needed to troubleshoot the P1490 code?
Basic tools include an OBDII scanner, a multimeter to test electrical connections, and potentially a smoke machine to check for EVAP system leaks.
8. How much does it cost to repair a P1490 code on a Cadillac?
Repair costs vary but typically range from $150 to $400, depending on whether the issue is with the sensor, wiring, or the purge pump itself.
9. Can a loose gas cap cause the P1490 code on a Cadillac?
No, a loose gas cap typically triggers a different EVAP system code, not P1490. This code is specific to the purge pump voltage sensor.
10. Will clearing the P1490 code solve the problem?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
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