P05B6: Supply voltage is low in the circuit for active grille air shutter B.
Meaning, symptoms, causes and checks
Supply voltage is low in the circuit for active grille air shutter B. The definition concerns the B shutter's supply rather than the A shutter's control signal.
Affected system: Powertrain
Symptoms
- Warning light may illuminate
- Related system function may be impaired
- Vehicle-specific symptoms vary
Possible causes
- Low or unstable supply voltage, fuse or relay fault, poor ground, or wiring damage
- Related wiring, connector, power or ground fault
- Vehicle-specific mechanical or control issue
What to check
- Record stored and pending codes and freeze-frame data
- Measure battery and charging voltage under load and compare with scan data; test the named circuit, fuse, relay, grounds and connectors.
- Confirm measured values against the vehicle service information
- Retest under the conditions that set the code
- Measure battery and charging voltage under load and compare with scan data; test the named circuit, fuse, relay, grounds and connectors.
- Repair the verified cause and confirm the code does not return
Also written as: P05B6-00, P05B600, PO5B6 (some scan tools add the fault-type byte, e.g. -00).