B1591 Code - Autolamp Delay Decrease Circuit Failure
Quick Answer
The B1591 diagnostic trouble code (DTC) refers to an Autolamp Delay Decrease Circuit Failure. Common causes include Faulty autolamp delay control module, Wiring issues or loose connections in the autolamp delay circuit, Blown fuse related to the autolamp delay system. 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
- B1591 indicates Autolamp Delay Decrease Circuit Failure.
- Common causes
- Common causes include Faulty autolamp delay control module, Wiring issues or loose connections in the autolamp delay circuit, Blown fuse related to the autolamp delay system.
- 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 B1591 Description
The B1591 diagnostic trouble code (DTC) refers to an Autolamp Delay Decrease Circuit Failure. This code indicates that there is a malfunction in the circuit responsible for controlling the delay in turning off the vehicle's automatic lamps. The autolamp delay feature allows the vehicle's headlights and other exterior lights to remain on for a specified period after the vehicle is turned off, providing illumination for the driver and passengers as they exit the vehicle.
Common Causes of B1591
- Faulty autolamp delay control module.
- Wiring issues or loose connections in the autolamp delay circuit.
- Blown fuse related to the autolamp delay system.
- Malfunctioning light sensor that triggers the autolamp delay feature.
- Corrosion or damage to the autolamp delay circuit components.
Symptoms of B1591
- Lights turning off immediately after the vehicle is turned off.
- Lights remaining on even after the vehicle is turned off.
- Battery drain due to lights not turning off.
- Malfunction indicator light (MIL) or check engine light illuminated on the dashboard.
How to Fix B1591
- Diagnose the issue by conducting a thorough inspection of the autolamp delay circuit and components.
- Test the autolamp delay control module and replace if necessary.
- Check and repair any wiring issues or loose connections in the circuit.
- Replace any blown fuses related to the autolamp delay system.
- Inspect and, if needed, replace the light sensor responsible for triggering the autolamp delay feature.
Cost to Fix B1591
The cost of repairing a B1591 code can vary depending on the specific cause of the issue and the labor rates at the repair shop. However, a rough estimate for this type of repair could range from $100 to $300, including parts and labor. It's important to note that rates can vary based on factors such as location, vehicle make and model, and the expertise of the technician. It's recommended to obtain a detailed quote from a trusted auto repair shop before proceeding with the repairs.
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Code B1591 Information for Specific Makes
- B1591 Buick — Mirror Vertical Position Sensor Voltage
- B1591 Cadillac — Mirror Vertical Position Sensor Voltage
- B1591 Chevrolet — Mirror Vertical Position Sensor Voltage
- B1591 GMC — Mirror Vertical Position Sensor Voltage
- B1591 Lexus — No Response From Audio HU
- B1591 Toyota — No Response From Audio HU
Frequently Asked Questions about B1591 Code
1. What are common symptoms of OBDII code B1591 (Autolamp Delay Decrease Circuit Failure)?
- Common symptoms include the automatic lamps failing to delay turning off, or the autolamp system not functioning as intended.
2. What can cause OBDII code B1591 to trigger?
- This code is typically triggered by issues with the autolamp delay decrease circuit, such as wiring faults, a faulty autolamp sensor, or a malfunctioning control module.
3. How can I diagnose the cause of OBDII code B1591?
- To diagnose the issue, you can perform a visual inspection of the autolamp system wiring, test the autolamp sensor for proper functionality, and use a diagnostic scanner to check for specific circuit faults.
4. Is it safe to continue driving with OBDII code B1591 present?
- While the code may not affect the overall drivability of the vehicle, it is recommended to address the issue promptly to ensure the autolamp system operates correctly.
5. Can I repair OBDII code B1591 myself?
- Depending on your automotive repair skills, you may be able to address the issue yourself by checking and repairing any wiring faults, replacing a faulty autolamp sensor, or resetting the control module.
6. How much does it typically cost to fix OBDII code B1591 at a repair shop?
- The cost of repair can vary depending on the cause of the issue and the labor rates of the repair shop. It's advisable to obtain quotes from different shops for an accurate estimate.
7. Will resetting the OBDII code B1591 resolve the issue temporarily?
- Resetting the code may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear once the system detects the fault again.
8. Can extreme weather conditions affect the autolamp delay decrease circuit and trigger OBDII code B1591?
- Yes, extreme weather conditions can potentially damage the wiring or components of the autolamp system, leading to the triggering of OBDII code B1591.
9. Are there any preventive maintenance tips to avoid OBDII code B1591 in the future?
- Regularly inspecting the autolamp system components, ensuring proper wiring integrity, and keeping the system clean from debris can help prevent issues that trigger OBDII code B1591.
10. Will OBDII code B1591 cause the vehicle to fail an emissions test?
- OBDII code B1591 is related to the autolamp system and is unlikely to cause the vehicle to fail an emissions test. However, it is important to address the issue for overall vehicle safety and functionality.
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