P1663 GMC Code - Change Oil Lamp Control Circuit Conditions
Quick Answer
With the engine speed over 600 rpm, the Powertrain Control Module (PCM) detects that commanded state of the Change Oil Lamp driver and the Actual state of the control circuit did not match for over 5 seconds. Common causes include Faulty Change Oil Lamp, Change Oil Lamp harness is open or shorted, Change Oil Lamp circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P1663 GMC indicates Change Oil Lamp Control Circuit Conditions.
- Common causes
- Common causes include Faulty Change Oil Lamp, Change Oil Lamp harness is open or shorted, Change Oil Lamp circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P1663 GMC Description
What are the Possible Causes of the DTC P1663 GMC?
- Faulty Change Oil Lamp
- Change Oil Lamp harness is open or shorted
- Change Oil Lamp circuit poor electrical connection
How to Fix the DTC P1663 GMC?
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 P1663 GMC 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 P1663 GMC Code
1. What does the OBDII code P1663 mean on a GMC vehicle?
The P1663 code indicates a fault in the Change Oil Lamp Control Circuit, meaning the system is unable to properly control or communicate with the oil change indicator.
2. What are the symptoms of the P1663 code in a GMC?
Common symptoms include the "Change Oil" lamp not turning on or staying illuminated even after an oil change, and possibly no other noticeable performance issues.
3. What causes the P1663 code on a GMC?
The main causes include a faulty oil change reminder lamp, wiring issues such as damaged or corroded connections in the circuit, or a malfunctioning ECM (Engine Control Module).
4. Can I drive my GMC with the P1663 code active?
Yes, you can usually drive the vehicle, as this code does not directly affect engine performance. However, it’s important to address the issue to maintain proper maintenance reminders.
5. How do you diagnose the P1663 code on a GMC?
Diagnosis typically involves inspecting the oil lamp circuit and wiring for damage or loose connections, checking the functionality of the oil change reminder lamp, and testing the ECM for faults.
6. How can the P1663 code be fixed on a GMC?
Repairs may include replacing damaged wiring, cleaning corroded connectors, replacing the oil change lamp if it's faulty, or reprogramming or replacing the ECM if necessary.
7. Will resetting the oil change reminder fix the P1663 code?
Resetting the oil change reminder may temporarily clear the code, but it won’t fix any underlying issues with the circuit or lamp.
8. How much does it cost to repair the P1663 code on a GMC?
Repair costs can range from $50 to $500 depending on whether it’s a simple wiring repair or if the ECM needs replacement or reprogramming.
9. Can a blown fuse cause the P1663 code on a GMC?
Yes, a blown fuse in the circuit controlling the oil change lamp could trigger the P1663 code, so checking the fuses is a good first step.
10. Does the P1663 code require ECM replacement on a GMC?
Not always. ECM replacement is only necessary if it’s confirmed to be malfunctioning after all wiring and lamp issues have been ruled out.
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