P1639 Saturn Code - PCM 5 Volt Reference Voltage Circuit Condition
Quick Answer
The P1639 diagnostic trouble code (DTC) for Saturn vehicles indicates a problem with the Powertrain Control Module (PCM) 5 volt reference voltage circuit. Common causes include Faulty wiring harness or connectors, Failed sensor or component drawing excessive current, Corrosion or damage to electrical connections. 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
- P1639 Saturn indicates PCM 5 Volt Reference Voltage Circuit Condition.
- Common causes
- Common causes include Faulty wiring harness or connectors, Failed sensor or component drawing excessive current, Corrosion or damage to electrical connections.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P1639 Saturn Description
The P1639 diagnostic trouble code (DTC) for Saturn vehicles indicates a problem with the Powertrain Control Module (PCM) 5 volt reference voltage circuit. The PCM is a crucial component of the vehicle's engine management system, responsible for controlling various functions such as fuel injection, ignition timing, and emissions. The 5 volt reference voltage circuit provides a stable voltage supply to various sensors and components within the engine system. When this circuit malfunctions, it can lead to a variety of issues that affect the vehicle's performance and drivability.
Common Causes of P1639 Saturn
- Faulty wiring harness or connectors
- Failed sensor or component drawing excessive current
- Corrosion or damage to electrical connections
- PCM malfunction or software issues
- Electrical interference or noise affecting the reference voltage signal
Symptoms of P1639 Saturn
- Check engine light illuminated on the dashboard
- Rough idling or stalling
- Loss of power or acceleration
- Poor fuel economy
- Engine misfires or hesitation
How to Fix P1639 Saturn
- Use a diagnostic scan tool to retrieve the specific sensor or component causing the issue.
- Inspect the wiring harness, connectors, and sensors for any visible damage or corrosion.
- Test the 5 volt reference voltage circuit using a multimeter to identify the faulty component.
- Replace the faulty sensor, wiring harness, or connector as needed.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix P1639 Saturn
The cost of repairing a P1639 code on a Saturn vehicle can vary depending on the specific cause of the issue. In general, you can expect to pay anywhere from $100 to $300 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's best to obtain quotes from local shops for a more accurate estimate. Additionally, the cost may be higher if the PCM needs to be replaced or if multiple components are affected.
When is the Code Detected?
Need more information about the P1639 Saturn code?
Need more information on how to fix the P1639 Saturn code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1639 Saturn code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1639 Saturn Code
No Frequently Asked Questions about P1639 Saturn Code found.
Discuss the causes and fixes for P1639 Saturn OBDII Code
Code P1639 Saturn comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.