The GMC Code B2600 00 is an indication of a Daytime Running Lamp Control Circuit. This code indicates that the battery voltage must be between 9-16 V and the headlamp switch must be in the AUTO position. When the Battery Control Module (BCM) detects a short to voltage in the DRL resistor control circuit, the GMC Code B2600 00 is triggered. Uniquely diagnosing and repairing this code requires knowledge of the DRL circuit and its components. As a result, the GMC Code B2600 00 is often difficult for even the most experienced automotive technicians. In this article, we will outline the causes and solutions for this code, so that technicians can properly diagnose and repair the issue.
Causes and Solutions for GMC Code B2600 00
| Causes | Solutions |
|---|---|
| Battery voltage is not between 9-16 V | Check and adjust voltage accordingly |
| Headlamp switch not in AUTO position | Put headlamp switch in AUTO position |
| BCM detects a short to voltage in the DRL resistor control circuit | Repair or replace the DRL resistor control circuit |
| Faulty BCM | Replace the BCM |
Checking Battery Voltage
The GMC Code B2600 00 is triggered when the battery voltage is not between 9-16 V. To check the voltage, use a voltmeter to measure the voltage across the battery terminals. If the voltage is not within the specified range, the battery should be recharged or replaced.
Headlamp Switch
The headlamp switch must be in the AUTO position for the GMC Code B2600 00 to be triggered. If the headlamp switch is not in the AUTO position, the code will not be triggered. To put the headlamp switch in the AUTO position, turn the ignition switch to the ON position and then press the headlamp switch until the AUTO position is reached.
Short to Voltage in DRL Resistor Control Circuit
The GMC Code B2600 00 is triggered when the BCM detects a short to voltage in the DRL resistor control circuit. To check for a short to voltage, use an ohmmeter to measure the resistance across the DRL resistor control circuit. If the resistance is not within the specified range, the DRL resistor control circuit should be repaired or replaced.
Faulty BCM
The GMC Code B2600 00 may also be triggered by a faulty BCM. To check for a faulty BCM, use a digital multimeter to measure the voltage across the power and ground terminals of the BCM. If the voltage is not within the specified range, the BCM should be replaced.
Conclusion
The GMC Code B2600 00 is an indication of a Daytime Running Lamp Control Circuit. Diagnosing and repairing this code requires knowledge of the DRL circuit and its components. In this article, we have outlined the causes and solutions for the GMC Code B2600 00. By following these steps, technicians can properly diagnose and repair GMC Code B2600 00 and get the vehicle back on the road.
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