B0508 - Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Left Daylight Running Lamp (DRL) Relay
  • Left Daylight Running Lamp (DRL) Relay harness is open or shorted
  • Left Daylight Running Lamp (DRL) Relay circuit poor electrical connection
  • Faulty Body Control Module (BCM)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B0508 Description

The Body Control Module (BCM) provides control for the LH DRL relay circuit. The BCM grounds the Left Daylight Running Lamp (DRL) relay control circuit in order to energize the LH DRL relay and turn ON the LF turn signal This allows the LF turn signal to be used for DRL and approach lighting functions. The BCM monitors the voltage level on the LH DRL relay control circuit. When the BCM commands the relay ON, the voltage level on the LH DRL relay control circuit should be low. When the relay is OFF, the voltage on the LH DRL relay control circuit should be high. If the BCM detects a voltage level other than expected, a malfunction is present and a Diagnostic Trouble Code (DTC) will set.
OBDII Code B0508 - Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit - AutoCodes.com

B0508 Information for specific makes

  • B0508 BUICK Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit
  • B0508 CADILLAC Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit
  • B0508 CHEVROLET Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit
  • B0508 GMC Short To Voltage Or BCM Open Internally In The LH DRL Relay Control Circuit

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B0508 Comments

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