P1664 Cadillac Code - Skip Shift 1-4 Upshift Lamp Control Circuit
Quick Answer
The P1664 Cadillac code refers to the Skip Shift 1-4 Upshift Lamp Control Circuit. Common causes include Faulty upshift lamp control module, Damaged wiring or connectors in the control circuit, Defective transmission control module. 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
- P1664 Cadillac indicates Skip Shift 1-4 Upshift Lamp Control Circuit.
- Common causes
- Common causes include Faulty upshift lamp control module, Damaged wiring or connectors in the control circuit, Defective transmission control module.
- 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.
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Code P1664 Cadillac Description
The P1664 Cadillac code refers to the Skip Shift 1-4 Upshift Lamp Control Circuit. This code indicates that there is a malfunction in the control circuit responsible for the upshift lamp that signals the driver to skip shifting from 1st to 4th gear under certain driving conditions. This feature is commonly found in manual transmission vehicles to improve fuel efficiency and reduce emissions during light acceleration. When this code is triggered, it can affect the vehicle's performance by causing issues with shifting and potentially impacting fuel economy.
Common Causes of P1664 Cadillac
- Faulty upshift lamp control module
- Damaged wiring or connectors in the control circuit
- Defective transmission control module
- Issues with the ECM programming
- Electrical shorts or open circuits
Symptoms of P1664 Cadillac
- Upshift lamp not illuminating during skip shift conditions
- Difficulty shifting gears
- Reduced fuel efficiency
- Check Engine Light illuminated
- Transmission slipping or jerking
How to Fix P1664 Cadillac
- Perform a thorough diagnostic scan to confirm the P1664 code and identify the specific cause of the issue.
- Inspect the upshift lamp control circuit, wiring, and connectors for any signs of damage or corrosion. Replace any faulty components.
- Test the transmission control module and ECM for proper functionality. Replace as needed.
- Clear the code from the vehicle's memory and reset the ECM to ensure proper operation.
- Test drive the vehicle to verify that the issue has been resolved and that the upshift lamp functions correctly.
Cost to Fix P1664 Cadillac
The cost of repairing the P1664 Cadillac code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the parts needed for this repair may range from $50 to $200, while the labor costs can range from $100 to $300. Overall, the total repair cost for this issue could be between $150 and $500. It is important to note that these estimates are approximate, and actual costs may vary based on the location, vehicle make and model, and the extent of the repairs needed. It is recommended to consult with a trusted mechanic or repair shop for a more accurate cost estimate.
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